The discovery of two atypical specimens of Rhodnius pictipes
Stål, 1872 in French Guiana and the examination of the female holotype of R. amazonicus
Almeida, Santos & Sposina, 1973, the only specimen of this species so far known, lead us to propose the rehabilitation of R. amazonicus synonymized with R. pictipes. The male is described for the first time and the female redescribed. Both external characters and genitalia distinguish R. amazonicus from R. pictipes
. R. amazonicus
shows affinities not only with pictipes but also with R. stali
Lent, Jurberg & Galvão, 1993 and R. paraensis
Sherlock, Guitton & Miles, 1977. A key is provided for these four species forming, in all likelihood, a natural group, i.e. the "pictipes group".