( Blattodea : Ectobiidae )

Xestoblatta Hebard, 1916 is revisited, with description of X. urucuana sp. nov. from northern Brazil. Additionally the hitherto known species X. amaparica Rocha e Silva Albuquerque & Gurney, 1962, X. surinamensis Bruijning, 1959 and X. vera Rocha e Silva Albuquerque & Fraga, 1975, are redescribed. Information on the genitalia of the males is also provided. All the species are included in the Xestoblatta surinamensis species group and the placement of X. jygautieri Grandcolas, 1992 in this group discussed. To facilitate species identification, we provide a key to the species of the X. surinamensis group, characterized by the subgenital plate with left style (ventral view) about two to five times larger than right style; right paraproct (dorsal view) with three lobes, one with a spiny projection, and median sclerite slender and lanceolate.

In this contribution, we redescribe X. amaparica, X. vera, and X. surinamensis, and the male genitalia is described for the first time.A new species, X. urucuana sp.nov., is also described.

MATERIAL AND METHODS
The genital plates were dissected after the posterior part of the abdomen was removed, using traditional techniques as de scribed by lopeS & oliveira (2000).After analysis, the genitalia were stored in microvials with glycerin and attached to the respective specimen, as recommended by Gurney et al. (1964).The male abdominal tergal modifications were observed through the base of the wings, after the structures were relaxed with a detergent solution.The terminology for the genitalia and the taxonomic classification follow roth (2003).Specimens were determined by comparison with specimens of Xestoblatta deposited in the "Blat taria Collection" of the Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil (MNRJ), and with descriptions in the literature.Images of the habitus and morphological details were taken with a camera coupled to a stereoscopic microscope.The holotypes of X. vera and X. urucuana sp.nov., and paratypes of X. surinamensis and X. amaparica were examined.The location of the holotype of X. surinamensis is unknown (Beccaloni 2016).Characters of X. caussaneli and X. jygautieri were based on illustra tions in the original description and on photographs provided by the Muséum National d'Histoire Naturelle, Paris, France.

Xestoblatta surinamensis species group
Diagnosis.Coloration glossy brown, with two brown marks on laterals of pronotum (ventral view).Subgenital plate with left style (ventral view) about two to five times larger than right style.Right paraproct (dorsal view) with three lobes, one lobe bearing spiny projection.Median sclerite slender, lanceolate.
Description of the male Holotype.Head triangular; intero cular space narrow, 0.78 mm, less than half distance between antennal bases; vertex completely exposed.Ocelli small, incon spicuous.Antennae long, slender, exceeding apex of abdomen.
Thorax.Pronotum convex and subtrapezoidal.Disc of pronotum lacking grooves.Fore femur, anteroventral surface with a row of 13 spines gradually decreasing in size apically, and two apical spines; middle femur, anteroventral surface with a row of seven spines gradually decreasing in size apically.Geniculate spine present; posteroventral surface with four spines subequal in size.Hind femur with row of six subequal spines on anteroventral surface, plus apical spine and geniculate spine.Middle and hind coxae bearing lateroapical projections on inner surface.Arolia present.Claws symmetrical and unspecialized.Tegmen developed, exceeding apex of abdomen, wider in anterior third; marginal field well demarcated and slightly concave; scapular field slightly enlarged and round; discoidal field ample, anal field wide, with eight auxiliary veins.Wings developed; ulnar vein with five com plete rami; apical triangle not developed; anal field folded in fan.
Etymology.The specific name refers to the type locality along the Urucu River, state of Amazonas, northern Brazil.
Remarks.Xestoblatta urucuana sp.nov. is similar to X. surinamensis in size, shape of paraprocts, tergal modifications on tergite VII, and median sclerite with lanceolate tip; but differs sharply from X. surinamensis by the configuration of the subgenital plate widened, with the lower margin setose, apex curved and slightly projected.Right stylus (ventral view) inserted near median surface, digitiform, weakly sclerotized, small, measuring about 1/5 of left stylus, bearing spiny projection near margin of plate (Fig. 5).

Figs. 13-23
Diagnosis.General coloration pale brown (Fig. 13).Head opaque with darkbrown marks scattered over it (Fig. 14).Vertex  with small brown mark, interocular space with illdefined dull bands, paler anteriorly, separated from clear area.Maxillary palp brownish yellow.Ocelli brown.Pronotum brown, margin narrow and dull.Central disk opaque with dark marks on each side of median area (Fig. 15).Legs pale, with marks.Color of spines same as legs.Legs.tegmen translucent brown.
Remarks.The subgenital plate of X. amaparica is consistent with the pattern found in the X. surinamensis group with respect to size, insertion of styles, and shape of paraprocts.It differs from other species of the group in the configuration of the styles on the subgenital plate (Fig. 17), and the right paraproct cylindrical with a bulbous apex and a few apical spines (Fig. 19).
Legs ferruginous yellow, coxae with two small pale brown marks.Spines ferruginous yellow, pulvilli white, arolia ferruginous yellow.Tegmen stained yellowish brown, except marginal field paler.Tergite and sternite following general coloration of body.Sternite with small lateral palebrown marks.
Redescription.Head ovaltriangular, interocular space nar row, 0.82 mm, slightly less than half distance between antennal bases.Ocelli small and inconspicuous.Vertex slightly exposed.Maxillary palp setose on all segments.
Thorax.Pronotum slightly convex, very slight angulation on posterior margin, maximum width in mediobasal region.Lateral flaps short, not deflexed.Legs robust with wide coxae; femur I with anteroventral surface bearing row of 12 long spines gradually decreasing in size apically, and ending in three long apical spines.Posteroventral surface with five equally spaced spines, the last spine apical.Pulvilli and arolia well developed, claws moderately developed.Tegmen well developed, exceeding apex of cerci.Marginal field slightly deflected, narrow.Discoidal field rounded.Scapular field ample.Anal field straight.
Remarks.Xestoblatta surinamensis is similar to X. vera in the shape of the subgenital plate, insertion of styles, and paraprocts.They differ in the pattern of the projection of the right phallomere and in the swordshaped configuration of the median sclerites.
Thorax.Pronotum slightly convex, with slight angulation on posterior margin, maximum width in mediobasal region, with deflexed lateral flaps.Legs robust and densely spiny with large coxae; femur I with anteroventral surface bearing row of 13 long spines gradually decreasing in size apically, and ending in three long apical spines.Posteroventral surface with five equally spaced spines, the last apical.Pulvilli, arolia and claws moderately developed.Tegmen welldeveloped, well exceeding apex of cerci.Marginal field slightly deflexed, narrow.Discoidal field rounded.Scapular field ample.Anal field straight.Subcostal vein long and sinuous, about 20 radial sectors, with apical sector ramified.Wing with three complete rami on cubital vein; apical triangle small but conspicuous.Four complete auxiliary veins.
Remarks.rocha e Silva-alBuquerque & FraGa (1975) con sidered this species to be similar to X. ecuadorana Gurney, 1939 in the shape of the subgenital plate.However, our observations indicate that it is similar to X. surinamensis in the shape of the subgenital plate and paraprocts with four small sclerotized spines.