Review of the sulcacitus group of Euschistus (Pentatomidae: Pentatominae: Carpocorini) with description of the internal female genitalia and a new species Author Bianchi, Filipe Michels Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. fmichels2@gmail.com Author Barão, Kim Ribeiro Unidade Educacional Penedo, Campus Arapiraca, Universidade Federal de Alagoas, Penedo, AL, Brazil kim.barao@penedo.ufal.br Author Grazia, Jocelia Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. jocelia@ufrgs.br text Zootaxa 2017 2017-12-06 4362 3 348 358 journal article 31229 10.11646/zootaxa.4362.3.2 375c7e7b-e311-47c3-9599-f0e16d227889 1175-5326 1094896 852AFFC6-42E7-4C52-A5B9-5FFA4E6759CC Key to species of sulcacitus group adapted from Rolston (1974) . The first couplet of the following key correspond to Rolston (1974) couplet 36. 1. Posterior margin of pygophore bissinuate, concave mesially in ventral view ( Figs 11, 14 ); posterior region of ductus receptaculi proximalis dilated in a cup-like sclerotized structure ( Figs 61, 62 )........................................... 2 1’. Posterior margin of pygophore sinuate, convex mesially in ventral view or mesial third slightly sinuose ( Figs 8, 17, 20 ); posterior region of ductus receptaculi proximalis straight, dilated or not, not sclerotized. ( Figs 60, 63, 64 ).................. 3 2(1). Broad black carina anterolaterad of parameres on lateral wall of genital cup ( Fig. 10 ); posterior margin of gonocoxites VIII slightly sinuose in posteroventral view ( Figs 49, 50 )............................................ E . olacitus Rolston 2’. Small black denticle anterolaterad of parameres on lateral wall of genital cup ( Fig. 13 ) posterior margin of gonocoxites VIII strongly sinuose in posteroventral view ( Figs 52, 53 )......................................... E. palacitus Rolston 3(1’). Posterior margin of pygophore quite convex mesially in ventral view ( Fig. 6 ); laterotergites IX surpassing dorsal band that unites laterotergites VIII in posteroventral view ( Figs 46, 47 )................................ E. corcovacitus Rolston 3’. Posterior margin of pygophore slightly sinuose in ventral view ( Fig. 15, 18 ); laterotergites IX not surpassing dorsal band that unites laterotergites VIII in posteroventral view ( Figs 55, 56, 58, 59 )............................................. 4 4(3’). Inferior layer of ventral rim concave mesially in posterior view ( Fig. 16 ); posterior margin of gonocoxites VIII mesially deeply concave ( Figs 55, 56 )................................................................. E . sulcacitus Rolston 4’. Inferior layer of ventral rim mesially tumescent in posterior view ( Fig. 19 ); posterior margin of gonocoxites VIII mesially slightly concave ( Figs 58, 59 ).............................................. E . tacitus Bianchi & Grazia sp. nov.