94 HOX. N. CHARLES ROTHSCHILD A SYNOPSIS OF 



Section 2. — Club o£ antenna distinctly seomented all round. 



& 



Keif to the Genera. 



a. Eye developed (cf. figs. 12, 13, & 26). 



a^. No comb on head. 

 a". Pygidium not projecting backwards (fig. 14) ; frons with 



tubercle < 8. Ceratophyllus.. 



b"^. Pygidium strongly convex, projecting backwards (figs. 15 



& 16) ; frons without tubercle 9. PygiopsyUa. 



h^. Two spines at angle of gena (fig. 26) 10. Clnasfopsylla. 



b. Eye vestigial or absent (figs. 27 & 28). 



«\ Abdomen without comb. 



a'^. Hind edge of tibiae with about 8 short and several long- 

 bristles, which do not form a comb. 

 a^. Eifth segment in fore and mid tarsi with five, and in 



hind tarsus with four lateral bristles 11 . Neopsylla. 



¥. Eifth segment in fore and mid tarsi with four and in 

 hind tarsus with three lateral bristles, there being an 

 additional pair of bristles in all the tarsi on the ventral 



surface in between the first pair 12. C'tenophf/iahnus. 



b^. ELind edge of tibife with about 12 short and 3 long bristles, 



the short ones forming a kind of comb 13.- Cte7iopsylla . 



b\ Abdomen with at least one comb 14. Hysfrichop.sy/la,. 



8. Genus Ceratophyllus, Curtis. 



The number of species is very large ; many o£ them are found on birds,, 

 but five only have been recorded from rats or house-mice. 



1. C. fasciatus, Bosc. The comb of the prothorax consists of 18-20 spines.. 

 The movable process of the clasper of the J' (fig. 18) has the proximal edge 

 angulate. The sternite of the seventh abdominal segment is slightly sinuous,. 

 without distinctly projecting lobe (fig. 20). — This species is common on 

 Mus noricegicus in Europe, and occurs elsewhere as well. 



2. C. londiniensis, Rothsch. The comb of the prothorax consists of 17-19' 

 teeth. The movable process of the clasper of the ^ is longer than in 

 fasciatus^ pointed and widest near the centre ; its proximal margin is non- 

 angulate (fig. 17). The sternite of the seventh abdominal segment of the 

 female has a broad truncate lobe (fig. 19). — The species is widely distributed 

 on rats and mice. It is apparently rare, but a large number of specimens 

 were once taken in London (South Kensington). 



3. C. anisus, Rothsch. The comb of the pronotum consists of 18 spines. 

 The eighth abdominal sternite of the c^ similar to that of C. niger [cf. fig. 2!)), 

 but slenderer. The 9 not known. — Originally described from Japan, where 

 a S was obtained off Felis sp. Another specimen was found at San 

 Francisco, California, taken off Mvs norweqicus. 



