Edessa nigridorsata Santos & Fernandes sp. nov.

(Figs.37–41; 48; 55; 56)

Etymology. Name refers to dorsal coloration of abdomen.

Holotype ♂. MEXICO, Chiapas: Municipio de Rayón, Selva Negra, above Rayón 1768m, 11-IX-1981, D.E. and P. M. Breedlove (USNM).

Material. Paratypes. MEXICO, Chiapas: ♂♀ same data (DAR); ♀ same data (UFRG).

Measurements. Head length (2.1–2.2); head width (3.2–3.4); pronotal length (2.5–2.9); pronotal width (6.9– 7.2); total length (10.5–12); abdominal width (6.5–7.5).

Body dorsally dark brown with some black areas mainly on pronotum and scutellum (Fig. 48); ventrally mostly black (Fig. 55). Head dorsally green with some black spots or almost completely black. Cephalic disc impunctate. Mandibular plates rugulose, impunctate and level with clypeus. Ventral surface of head dark brown with black areas, dark spotted above and below antenniferous tubercles; impunctate. Antennal segments black, third, fourth and fifth segments with basal white rings increasing in width. Pronotum greenish-brown on pronotal scars or anterior half, remaining areas black; bearing dense dark punctures; anterolateral margin yellowish. Apex of scutellum with a dark yellow spot. Hemelytron with a suffused area on corium. Ventrally thorax with yellow spots and stripes and concolorous punctures. Metasternal process and evaporatorium without punctures. Peritrema yellow. Metasternal process yellow with a median dark stripe; arms of bifurcation short, strong and quite divergent (Fig. 41). Legs light brown and not spotted. Connexivum black with triangular yellow spots. Ventral surface of abdomen finely and sparsely punctured, black with yellow mesial stripes and a few yellow lateral spots. Pair of rounded dark brown to black spots visible on segment VII.

Male: Pygophore (Figs. 37–39) with anterior part yellow and posterior black. Superior processes of the genital cup pedunculated and narrow, expansion somewhat thicker than the stalk, slightly concave and curved downwards; margin not reaching dorsal rim (Fig. 38). Paramere brown with margins black; distal part a little bit wider than the main stalk; two ventral processes rounded, long, twisted and posteriorly directed (Fig. 38). Proctiger with only one keel; posterior face ogive-like and emarginated due to lateral constrictions (Figs. 37–38). Ventral rim dark brown with fine and dark concolorous punctures; expansions acuminate and not swollen (Figs. 38–39).

Female: Gonocoxites 8 reddish-brown convex at the sides, bearing a few dark punctures; medial margins contiguous, posterior margin of both plates forming a “W” (Fig. 40); excavation very large broader than gonocoxite 9 exposing it almost completely. Gonapophyses 8 smooth and placed below the level of gonocoxites 8 and 9 leaving a hole in between them. Gonocoxite 9 not folded or constricted just below thick part, basal part almost plain and not forming projections. Laterotergites 9 wide, grooved and not punctured, slightly acuminate apex barely surpassing the band uniting laterotergites 8 (Fig. 40).

Comments. In E. nigridorsata the parameres and genital cup processes are completely different from the other species of the group. This species shares with E. picticornis the gonocoxites 8 with posterior margin outline in a “W”, but several characteristics group this species with E. pudibunda and E. nigriventris (see E. pudibunda comments).

Distribution (Fig. 56): Mexico: Chiapas.