REVISIOX OF AMERICAN SIPHONAPTERA—BA KER. 131 



Genus CTENOCEPHALUS Kolenati. 

 1904. Ltenocfp}uila» Tikabowhi, Arehiv. de Parasit., VIII, p. 252. 

 CTENOCEPHALUS CANIS (Curtis) Baker. 



Koth.schild " again asserts the absolute distinctne.ss of c(.m!>< ?md. fells. 

 After the reception of this paper the material in the collection here 

 was again gone over, with the result that the conviction remains that 

 felis is at most a variety, and that with the recognition of fcJU many 

 other varieties v/ill also have to be recognized. After liothschild's 

 first paper on the subject the preparation of hundreds of specimens 

 from different parts of the world was begun, taken from dogs and 

 cats, both domestic and wild, for the purpose of making an extensive 

 study in variation, comparing every specimen down to the last hair, 

 just as has also been arranged for in the case of certain species of 

 Ceratophyllm. It is hoped to carry these very important studies to 

 a conclusion soon, and at that time the writer will be ready to present 

 various other varieties of canh too numerous to name. 



Genus SPILOPSYLLU S, ne^w genus. 



The placing of alinplcr and inx<inalix in CtenocephaJ as was but a 

 temporary expedient at l)est. Their separation is inevitable, since 

 they are of totally dili'erent relationships. 



SYNOPSIS OF SPECIES. 



A. Mandibles reaching tliree-fourths of anterior coxa^; head ctenidia in male with 

 eight spines on either side .vhnple.r 



A A. Mandibles reaching one-fourth to one-half of anterior coxje; liead ctenidia in 

 male with four to six spines on either side inicqualis 



Genus PARAPSYLLUS Enderlein. 



1903. ParapsjillKs Enderlein, Deutsches Tief-see Exped. 1898-99, III, p. 260. 

 (Type, Pule.r lo)igirornifi Enderlein.) 



Genus ODONTOPSYLLUS, new genus. 



This group of species, origuially referred to CeratopliyUus^ possesses 



the striking!}' Pulex-like character of minute teeth on the inside of hind 



coxaj. 



SYNOPSIS OF SPECIES. 



A. Teeth on inside of hind coxye in several rows; eyes well developed. 



B. Pronotal ctenidium of about forty spines multis}:iui<t.^us 



BB. Pronotal ctenidium of about twenty-four spines dcntatus 



AA. Teeth on inside of hind coxte in one row; pronotal ctenidium of about fourteen 

 spines. 



B. In front of eyes a single row of three bristles vhiirlottensh. 



BB. In front of eyes a single bristle and two rows of four or six bristles each. 



tdegonl 



aNovitates Zoologicse, XII, Jan., 1905. 



