9 medially concave and gonapophyses 9 with a medial thickening. The genus is herein revised and illustrated, with emphasis on morphology of external genitalia.

ABSTRACTBrachystethus Laporte, 1832 is revised. Brachystethus coxalis Breddin, 1904, B. cribrus(Fabricius, 1781), B. geniculatus (Fabricius, 1787), B. improvisus Breddin, 1905, B. rubromaculatusDallas, 1851, B. signoreti Stal, 1872, B. tricolor Bolivar, 1879, B. vexillum Breddin, 1903 and B.vicinus Signoret, 1851 are redescribed based on morphological characters, with emphasis on genitalia ofboth sexes. A new species, B. schuhi, from Guyana, is described, and B. discolor (Walker, 1867), incertaesedis, is removed from the genus. Illustrations and a key for species of Brachystethus are provided.KEYWORDS. Edessinae, taxonomy, Neotropical, genitalia. INTRODUCTIONBrachystethus was described by L APORTE (1832) as a subgenus of Edessa; S PINOLA (1837) elevated Brachystethus to generic status. K IRKALDY (1909) transferredBrachystethus to Pentatomini, listing ten species: Brachystethus cribrus (Fabricius, 1781),B. geniculatus (Fabricius, 1787), B. rubromaculatus Dallas, 1851, B. vicinus Signoret,1851, B. discolor (Walker, 1867), B. signoreti Stal, 1872, B. tricolor Bolivar, 1789, B.vexillum Breddin, 1903, B. coxalis Breddin, 1904 and B. improvisus Breddin, 1905. Thegenus was included by R