sp. n. from Bolivia, Beni province, is described, diag- nosed and keyed inside the inner group of Cyriocosmus
Simon 1903 which is represented by species with reduced paraembolic apophysis in male palpal bulb structures. The new species can be distinguished from all other cogeners, ex- cept C. blenginii
Pérez-Miles 1998, by uniformly coloured carapace and lateral four-striped pattern on abdomen. C. perezmilesi
sp. n. differs from C. blenginii
by presence of the reduced paraembolic apophysis and bicolour femora (reddish brown, distally black).