Scielo RSS <![CDATA[Revista Brasileira de Entomologia]]> vol. 60 num. 3 lang. es <![CDATA[SciELO Logo]]> <![CDATA[Species of Hybotinae from Podocarpus National Park, Ecuador (Diptera, Empidoidea, Hybotidae)]]> ABSTRACT The Hybotinae of the Podocarpus National Park were studied. Fourteen species are recorded and nine new species are described and illustrated: Euhybus pectinifemur sp. nov., Neohybos fuliginosus sp. nov., Neohybos globosus sp. nov., Neohybos rostratus sp. nov., Neohybos serratus sp. nov., Neohybos spinosus sp. nov., Syndyas longiventris sp. nov., Syneches flavithorax sp. nov. and Syneches polleti sp. nov. A key to Neohybos species from Ecuador is also presented. <![CDATA[High-level phylogeographic structuring of <em>Neoleucinodes elegantalis</em> Guenée (Lepidoptera, Crambridae) in Brazil: an important tomato pest]]> ABSTRACT Neoleucinodes elegantalis is an important tomato pest in Brazil, occurring throughout the country and resulting in economic losses in agriculture. In several species, biogeographic studies in Brazil indicate the structuring of populations, following the refuge model, with a split between the populations of the northeast and the southeast regions of Brazil. The objective of this work was to analyze the phylogeography of N. elegantalis in Brazil, understanding its population structure and the demographic patterns. Larvae were collected from eight locations throughout Brazil, and the mitochondrial cytochrome c oxidase subunit 1 gene was analyzed. A total of 628 bp in 51 individuals were obtained, showing 12 haplotypes with a haplotype diversity of 0.836. Spatial analysis of molecular variance (SAMOVA) and cluster analysis showed two populations, indicating population structuring between individuals from the northeast (population 1) and southeast (population 2) regions of Brazil. Phylogenetic analysis indicated that the clades corresponding to the groups defined by SAMOVA have a divergence time of 0.2–0.5 million years, suggesting isolation during climatic events and a separation of the two populations coinciding with the predicted refuges to the Atlantic forest. <![CDATA[<em>Aulacocyclus yorkensis</em> a new species of Passalidae (Coleoptera: Scarabaeoidea) from Australia, with a key to the identification of Australian species of the genus]]> ABSTRACT A new species, Aulacocyclus yorkensis sp. nov., is described from Cape York Peninsula, Australia. This species is similar to A. teres Percheron, these two being the largest Aulacocyclus in Australia, but they can be distinguished by the shape of the central tubercle and the pattern of pubescence on the mentum and metasternum. Additionally, illustrations of the new species and a key to the identification of the species of Aulacocyclus of Australia are provided. <![CDATA[A new spittlebug species of <em>Deois</em> (<em>Pandysia</em>) (Hemiptera, Cercopidae, Ischnorhininae) with a key to species of the subgenus]]> ABSTRACT Deois (Pandysia) paschoali sp. nov. from southern Brazil is described and illustrated. This species can be distinguished from other congeners by the following characters: aedeagus with dorsal margin serrate and paramere with a truncate and serrate spine. A key to species of Pandysia is provided. <![CDATA[Review of the New World genus <em>Cholomyia</em> (Diptera, Tachinidae), with a new species from Costa Rica]]> ABSTRACT The tachinid genus Cholomyia presents Neotropical and Nearctic distribution with three species: C. acromion (Wiedemann, 1824), C. filipes (Walker, 1857), and C. inaequipes Bigot, 1884. In the present paper, all species are reviewed and redescribed, and a new species from Costa Rica is described, C. zumbadoi sp. nov. An identification key based on males is provided. For the first time, the male terminalia of all species, and the female terminalia and first instar larva of C. inaequipes are described and illustrated. Finally, based on the detailed morphological study we discuss the systematic placement of Cholomyia into Myiophasiini-Tachininae. A list of host–parasite records is synthesized. <![CDATA[A new species of <em>Machaeriobia</em> Rübsaamen, 1915 (Diptera, Cecidomyiidae) from Brazil]]> ABSTRACT A new species of Machaeriobia Rübsaamen, 1915 (Diptera: Cecidomyiidae) from Brazil. Machaeriobia Rübsaamen, 1915 is a Neotropical genus, until now known from a single species, M. machaerii (Kieffer, 1913), described from Brazil (State of Santa Catarina). That species induces spherical leaf galls on Machaerium sp. (Fabaceae) and its geographical distribution is still restricted to the type-locality. A new galling species, Machaeriobia gemmae, associated with Machaerium macaense (Fabaceae), is described and illustrated (larva, pupa, male, and female) based on material collected in the Parque Nacional da Serra dos Órgãos (State of Rio de Janeiro, Brazil). The new species is unique for its one or two-segmented palpi, deeply notched aedeagus, pupa with free dorsal abdominal spines, larva with reduced spatula and two apically sclerotized terminal lobes. We synonymize Anadiplosis Tavares, 1916 under Machaeriobia Rübsaamen, 1915. Six wasp species (Hymenoptera) are associated with the galler: Tanaostigmodes carinatus La Salle 1987 and Tanaostigmodes sp. (Tanaostigmatidae), Galeopsomyia sp. (Eulophidae), Calorylea sp. (Eurytomidae), and two undetermined species of Eurytomidae. <![CDATA[First larval description and chaetotaxic analysis of the neotropical whirligig beetle genus <em>Enhydrus</em> Laporte (Coleoptera, Gyrinidae)]]> ABSTRACT The larva of the whirligig beetle Enhydrus sulcatus (Wiedemann, 1821) is described and illustrated for the first time, including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages and legs. Larvae of Enhydrus Laporte, 1834 exhibit the characters traditionally recognized as autapomorphies of the family Gyrinidae: well developed cardo, completely divided prementum, presence of lateral abdominal tracheal gills, and presence of four terminal hooks on the pygopod. The egg bursters located on the parietal, the presence of an additional sensorial plate on the third antennomere, and a well developed lacinia may also represent autapomorphies of the family. Enhydrus larvae share with those of the other known Dineutini genera the presence of numerous minute additional setae on the mandible, the presence of additional setae on the cardo, the submedial position of the coxal seta CO12, the absence of the trochanteral seta TR2, and the presence of numerous pore-like additional structures on the ultimate maxillary and labial palpomeres. On the other hand, Enhydrus can be distinguished from the other known dineutine genera by the presence of pore-like additional structures on the basal maxillary and labial palpomeres, the presence of ventral spinulae on the pygopod, and the bare tracheal gills, among other characters. <![CDATA[<em>Nectarinella manauara</em>, new species and record of the genus from Brazilian Amazonia (Hymenoptera, Vespidae, Polistinae)]]> ABSTRACT Nectarinella manaura sp. nov. is described, representing the first record of the genus from Brazilian Amazonia. Its description raises richness for Nectarinella from two to three species, and extends the range of characteristics for the genus, especially in terms of body size and color patterns. Discovery of the new species may shed new light into the knowledge of phylogenetic relationships between Nectarinella and other closely related genera. <![CDATA[Diurnal flight periodicity of a Neotropical ant assemblage (Hymenoptera, Formicidae) in the Atlantic Forest]]> ABSTRACT In this study we document for the first time flight patterns along a 24 h time range for an ant assemblage in one of the most diverse ecosystems on Earth, the Brazilian Atlantic Forest. Malaise traps were used to analyze the diurnal nuptial flights of a Neotropical ant assemblage during five days. Traps captured 802 individuals, revealing a remarkably high diversity (42 ant species), with samples strongly male biased (1:22). Contrariwise to similar studies, we found only a small proportion of species engaged in nocturnal nuptial flights, with diurnal flights accounting for an impressive 95% of all ant flight activity recorded. For the 18 most common species, three ant groups could be identified regarding flight period: sunrise, sunset, and continuous flight activity. Similarity analyses, however, suggest that closely related time ranges of flight activity may actually not be continuous. Further, three species showed pulsed flight activity, at varied hours of the day. Two species of Hypoponera showed flight activity at different periods of the day, suggesting congeneric staggered nuptial flights. Our results match long-term studies of ant assemblages showing high diversity of flight phenologies in hyperdiverse tropical ant assemblages and provide the first data on the reproductive phenology for several Neotropical ant species. <![CDATA[Flight patterns and sex ratio of beetles of the subfamily Dynastinae (Coleoptera, Melolonthidae)]]> ABSTRACT Dynastinae is one of the most representative subfamilies of Melolonthidae (Scarabaeoidea) and has considerable ecological importance due mainly to interactions with plants of the families Araceae and Annonaceae. This relationship has led to the evolution of nocturnal activity patterns, which are influenced by environmental conditions. In the present study, abiotic factors were investigated to comprehend the influence on the flight patterns and identify the sex ratio of beetles from this subfamily. A study was conducted at Campo de Instrução Marechal Newton Cavalcanti in northeastern Brazil between December 2010 and November 2011. Thirteen species of Dynastinae were identified, most of which were from the genus Cyclocephala. Abundance and richness were greater in the dry season. Six species exhibited peak flight activity at specific periods of the night. More females than males were recorded for Cyclocephala distincta and C. paraguayensis. The present findings suggest that rainfall reduces the flight activity of these beetles and different time schedules may be related to mating behavior, foraging behavior and the avoidance of interspecific resource competition. <![CDATA[Biological characteristics of black armyworm <em>Spodoptera cosmioides</em> on genetically modified soybean and corn crops that express insecticide <em>Cry</em> proteins]]> ABSTRACT This study aimed to evaluate the development and reproduction of the black armyworm, Spodoptera cosmioides when larvae fed on leaves of Bt-corn hybrids, expressing a single Cry1F and also Cry1F, Cry1A.105 and Cry2Ab2 in pyramided corn and their non-Bt-isoline (hybrid 2B688), as well as on leaves of two soybean isolines expressing the Cry1Ac protein and its non-Bt isoline (A5547-227). We also assessed the effect of these Bt and non-Bt plants on the leaf consumption rate of S. cosmioides larvae. This pest was unable to develop when fed on any of the corn isolines (Bt and non-Bt). When both 1st and 3rd instar larvae were fed on corn leaf, mortality was 100% in both Bt and non-Bt corn. In contrast, when corn leaves were offered to 5th instar larvae, there were survivors. Defoliation and leaf consumption was higher with non-Bt corn than with both of the Bt corn isolines. There was no negative effect of Bt soybean leaves on the development and reproduction of S. cosmioides with respect to all evaluated parameters. Our study indicates that both Bt and non-Bt corn adversely affect the development of S. cosmioides while Bt soybean did not affect its biology, suggesting that this lepidopteran has major potential to become an important pest in Bt soybean crops. <![CDATA[Effect of different diets on biology, reproductive variables and life and fertility tables of <em>Harmonia axyridis</em> (Pallas) (Coleoptera, Coccinellidae)]]> ABSTRACT The biology, reproductive variables and population growth indicators of Harmonia axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) fed on three diets, namely Cinara atlantica (Wilson, 1919) (Hemiptera: Aphididae), Brevicoryne brassicae (Linnaeus, 1758) (Hemiptera: Aphididae), and frozen eggs of Anagasta kuehniella (Zeller, 1879) (Lepidoptera: Pyralidae), were evaluated. With all three diets, birth rate was higher than mortality, resulting in positive rm values and thus indicating population growth. Under the conditions used in the experiments, H. axyridis was able to survive, develop and reproduce normally. This demonstrates that are different kind of food that can be essential for supporting the reproduction of some species of Coccinellidae, but not with the same optimization of preferred prey. <![CDATA[Association of <em>Anagrus amazonensis</em> Triapitsyn, Querino & Feitosa (Hymenoptera, Mymaridae) with aquatic insects in upland streams and floodplain lakes in central Amazonia, Brazil]]> ABSTRACT Anagrus amazonensis Triapitsyn, Querino &amp; Feitosa (Hymenoptera, Mymaridae) is a parasitoid that uses aquatic insect eggs as a host for the development of its immature stages. The objectives of this study are to record the interaction between A. amazonensis and its hosts and the aquatic plants used by these hosts to lay their eggs. Field work was conducted in floodplain lakes and upland (terra firme) streams, in four municipalities in Amazonas State, Brazil, where aquatic plants were scanned for the presence of aquatic insect eggs. In the laboratory, eggs were maintained in plastic containers with water until the emergence of the parasitoid or of the first instar insect. A total of 1223 adults of A. amazonensis emerged from eggs of Hemiptera, Lepidoptera and Odonata; these eggs were collected on 12 species of aquatic plants. <![CDATA[First record of <em>Atherigona reversura</em> Villeneuve (Diptera: Muscidae) feeding on Bermudagrass (<em>Cynodon dactylon</em> cv. Jiggs, Poaceae) in Brazil: morphological and molecular tools for identification]]> ABSTRACT Bermudagrass (Cynodon dactylon cv. Jiggs) is an important food source for dairy cattle in the semi-intensive milk production systems most often used in southern Brazil. Although many insect pests are associated with feed grasses, we report here the first occurrence of the fly Atherigona (Atherigona) reversura Villeneuve, 1936 (Diptera: Muscidae) feeding on bermudagrass in Brazil. This potential pest was observed in April 2015 in three localities (Abelardo Luz, Palmitos, and Videira) in western Santa Catarina, in southern Brazil. The infested plants had senescent and necrotic terminal leaves that reduced plant growth. New growth had to sprout new tillers from basal nodes, which resulted in a reduced plant growth rate. We also provide a morphological identification key (with figures) for A. (Atherigona) reversura and A. (Acritochaeta) orientalis Schiner, 1868. A molecular identification based on COI is also provided to better differentiate species.