1875 there was only one described genus in the family Cybocephalidae. It was not until

1891 that Sharp described a second genus, Pycnocephalus. Sharp recognized that the

size and shape of the head as well as the dilated middle and hind tibiae justified the

creation of a new genus. Cybocephalus deyrollei clearly exhibits the features described

by Sharp; therefore we place it in Pycnocephalus. The type specimens of Pycnocephalus

metallicus Sharp, the genotype, were also examined and compared to C. deyrollei. The

identification of C. deyrollei specimens was based on the published description since type

specimens were not available for examination.