Key to Pyrrhosphodrus species

1 Pronotum with a transverse black line between anterior and posterior lobes........................................ 2

1’ Pronotum unicolor..................................................................................... 3

2 (1) Scutellum black with a middle yellow spot; membrane of hemelytra bordered with black; all femora yellowish with black annuli..................................................................................... P. geraesensis

2’ Scutellum not black; membrane of hemelytra not bordered with black; femora yellowish, apically black, hind femur in addition with medial black annuli....................................................................... P. amazonus

3 (1’) General color yellowish; fore- and mesofemora yellowish with obsolete annulations; prosternum unicolored; abdominal sternites mostly black with yellow bands............................................................... P. militaris

3’ General color reddish; fore- and mesofemora black with conspicuous subapical pale brown annuli; two parallel dark stripes lateral to the prosternal sulcus; abdominal sternites reddish, anterior margin of segments V–VII darkened, with small whitish lateral dots........................................................................... P. caatingensis sp. nov.