Two new species of Bittacidae ( Mecoptera ) from the Amazon Basin

Two new species of Bittacida<J (Mecoptera) from Humboldt Biological Reserve, Mato Grosso state, Brazil, are described and ecological notes are given.

Although severa!species of Mecoptera have been described from southern Brazil (Souza Lopes &Mangabeira, 1942, andMorgante, 1967), only one specics has been recorded from the Amazon Basin.Thus, it was with considerable interest that recent collect ions of INPA (Instituto Nacional de Pesquisas da Amazônia) turned up nine specimens representing three different species.Two of these spec1es are new, and are herein described.
LEGS: Coxae dark br'Jwn with many long, yellowish setae.Femora and tibiae tan, becoming dark brown at apex; annular setae dark brown; spines black.Tibial spurs light brown.Tarsi d3rk brown wilh numerous darker setae and spines.First tarsal segment as long as next three together.
WINGS: Forewing 25 mm.long, falcate at tip (fig. 1) .Base color light amber with dark browr margining most crossveins and vein forks.Alternating pattern of dark and light between R1 and S1 +2 (R2+3).First series of crossveins forming nearly straight, continuous line from S1 + 2 to CuA.Large white thyridium at first fork of M. From three to 5 costal crossveins beyond basal crossvein.Subcostal crossvei n far distad of radial sector fork and sli ghtly proxima l of apex of Se.Apical crossvein absent.Hindwing similar to forewing.
ABDOMEN OF MALE: Segments 2 to 8 With mottling of tan and dark brown; with fine, whitish pubescence.Dorsal lobes of ninth tergum tan, becoming dark brown apically; much longer than basistyles; covered with whitish pubescence (fig.2) .lnner surface of dorsal lobes with pockets with openings directed anteriad (figs.3&4).Margin of pocket openings bearing ventro-mesal lobe and numerous stout spines.Patch of small spines on inner surface of dorsal lobes near bases.Basistyles dark brown with whitish pubescence.Oististyles small, brownish.Cerci dark brown, not reaching to tip of dististyles.Aedeagus amber, simply recurved.Proctiger not visible.
ABDOMEN OF FEMALF.. Segments 2 to 9 brown wi th fine, wh i ti sh pubescence.Cerci r-mail, dark brown.DAMAGE: Holot ype has wrinkled wings, as if the specimen had been placed in fluid at one time.In addition, 3 enti re legs and tarsal segments of two others are missing.Only the base of one antenna remains.Allotype is missing left hindleg and ta rsal segments of three others.Paratype is missing left midleg and tarsal segments from two ot hers.This species was named after the river valley in which it was collected.lt appears to be closely related to Bittacus andinus Londt & Byers, but the large number of costal crossveins readily places this species in the genus Neobittacus, which heretofore had been known from only one species, Neobittacus blancheti (Pictet) .Neobittacus aripuanaensis can be separated from this other species of Neobittacus by its smaller sizef reduced pigmentation of the wingsf and length and configuration cf the dorsal lobes of the male ninth.tergum.The similarities among Bittacus andinus and the two species of Neobittacus point out the close relationship between the two genera.
This species was collected in a moistf upland, primary forest at approximately 300 m.HEAD: Black with fine whitish pubescence.Compound eyes dark plumf large, meeting at mid-line below antennae; occupying most of surface area of head.Ocellar triangle black, raised above vertex.Lateral ocelli caudad of antennae; median ocellus between antennae.Rostrum dark brown with scattered setae and patch of denticles on caudal su rface.Scape , pedicel f and 19 flagellar segments dark brown.l\nt ennal length about 3 mm.THORAX: Pro-, meso•.and metanotum dark brown with short, whitish pubescence; without spines.Pleura l regions dark brown with fine whitish pubescence.
Legs: Forefemora tawny basally , dark brown apically.Foretibiae tibial spurs and 1st tarsal segment tawny.Other tarsal segments of forelegs dark brown.Midfemora dark brown, becoming t awny at apex.Midtibiae and tarsi dark brown .Hindfemora and tibiae dark brown basallyf becoming tawny at apex.Proxima l half of 1st tarsal segment of hind leg tawny.Dista! ha lf cf lst tarsal segment and ali other tarsal segments dark brown.Spines on ali legs dark brown.First tarsal segment of fore-and mid-~egs about equa l in length to distai 4 tarsal segments together.First tarsal segment of hindleg only about half the length of same segment in fore-and midlegs and two-thirds length of distai 4 tarsal segments together.
WINGS: Forewing 16 mm.longf and very narrow.Wings clear, except for darkened stigma (f ig. 5) .Subcosta l crossvein at or very near to radial sector fork.Apical crossvein absent, but crossvein between CuA and M4.Two thyrid ial spots between S (R) and Mf and between S3+4 and M1 + 2. Hindwing similar to forewing.
ABDOMEN OF MALE: Segments 2 to 5 light brown.Segments 6 to 8 dark brown.Dorsal lobes of ninth tergum tawny, with caudal surface forming dorsal and ventral points, and mesally-directed ridge between points; slightly longer than basistyles (fig.7).Dorso-caudal

VARIATION:
The color pattern of the two fem:~ies is somewhat darker than that of the male, forming a striking pattern of dark legs with light bands at the apex of femur and tíbia and base of first tarsal segment.
.DAMAGE: Ali three specimens appear to be in perfect condition.This species was named for the ornate aedeagus of the male.lt is most closely related to P. furcatus Byers, but differs in the more elaborate aedeagus and configuration of the dorsal lobes.The reduced size of the female cerci may also be characteristic.

A CKNOWLEDGMENTS
I wish to thank Anthony 8. Anderson for plant identifications, and George W. Byers for a drawing of the holotype of Neobittacus blancheti (Pictet) .
elevation.Dominant trees included Cousapoa sp.(Moraceae) f Swietenia macrophylla King (Meliaceae) f and Bertholletia excelsa HB. (Lecythidaceae) .Understory t rees included Socrotea exorrhiza (Mart.)H. Wendl.(Pa lmae) f with a ground cover of Selaginella sp.For a more complete review of the flora of this areaf see Lisboa e{ a/., 1976.Three days of intensive collecting in the type locality in mid-March failed to y!eld additional specimens.424-Pazius ornaticandus n. sp.Description based on 1 malef 2 femalesf pinned.