“…Key to the Neotropical species of Ribautia with coxal organs grouped in clusters Ribaut (1923) did not specify the number of clusters of coxal organs in each coxopleuron of the ultimate leg-bearing segment for R. seydi; however, this species is considered herein as having 2 + 2 clusters on the basis of two specimens from Peru ("40 miles E of Abancay") showing this trait and confidently assigned to this taxon by Chamberlin (1955Chamberlin ( -1956 In 12 of the Ribautia species recorded from Peru (R. andecola, R. carpisha, R. colcabensis, R. combinata, R. junina, R. limaensis, R. montana, R. peruana, R. seydi, R. silvana, R. titicacae, and R. williamsi) the coxal organs are partially or totally grouped in clusters, and the species can be separated by using the identification key above. In the remaining two species, i.e.…”