96 



HON. N. CHARLES ROTHSCHILD — A SYNOPSIS OF 



clasper is about one-fourth longer than the non-movable process. In the ? 

 the anal sternite is evenly convex beneath (fig. 16). 



10. Genus Chiastopsylla, Rothsch. 



The genus includes a few species from South Africa, one of which has 

 been obtained from a rat. 



1 . Ch. rossi, Water st. Only one female known, which was taken off a rat 

 in South Africa. Probably a common insect. 



11. Genus Neopsylla, Wagn. 



Very near Ctenophthahnus, but easily distinguished by the fifth tarsal 

 segments bearing no ventral pair of bristles in between the first lateral pair. 

 A small number of Palfearctic species, one of which was obtained from 

 a rat. 



1. N. bidentatiformis, Wagn. Head with two spines at the genal edge 

 nearly as in CldastopsyUa (fig. 26). — Russia. 



