NO. i3t;i. JiEVJSIOX OF AMERICAN SIl'IIONAPTERA—BAKIin. 405 



Lateral portion of ninth tergite with tlie loho hiroe and thumb- 

 shaped, nearly equaling the claspors, and scarcely dilated where stand 

 the usual two l)ri8tle.s over insertion of claspers. The upper clasper 

 is a large, subti-iangular stalked sclerite with \\\v inner edge vertica 

 and the angles rounded. The sloping hind margin is armed with six 

 short, stout, black teeth, five ])elow on the dilated portion and one 

 al)ove, where there are also three bristles on the margin. The lower 

 claspers also each bear a single, stout, black, deflected tooth. 



Length, 2.25 nmi. 



Type.—C^i. No. 6!)10, U.S.N.M. 



CERATOPHYLLUS WAGNERI, new species. 

 Plate XV, figs. 3-7. 



Two specimens of this unusuall}' distinct species were collected Ijy 

 Professor Aldrich at Moscow, Idaho. Both were males, one coming 

 from the white-footed mouse {Peroniyscus leucoj)us), and one from the 

 house mouse. This last is one of very few records for fleas on house 

 mice or rats in America. But it is entirely different from any 

 European species occurring on this animal. 



The head is flattened above in the usual manner. The front is very 

 roundly curved to the mouth, the frontal notch very distinct and rather 

 high on the front. Gena with two oblique rows of bristles, the lower 

 row of three, with the two outer quite heavj^, the upper row of live 

 or six considerably smaller. Gena below eye narrowed posteriorly to 

 an obtuse point. The rather narrow antennal groove, reaching nearly 

 to the upper margin of the head, with which it is connected l)v a 

 chitinous thickening. Hind margin of antennal groove lined with 

 about twenty small, short hairs. Back of antennal groove on disk of 

 vertex there are three bristles, one large, and two smaller. Hind 

 margin of head with the normal bristles, about ten smaller with the 

 usual larger ones at lower angles. Labial palpi equaling anterior 

 trochanters. 



Pronotum with a transverse row of about twelve good-sized lu'istles, 

 those at lateral angles far larger; on the hind mai'gin occurs a cteni- 

 dium of eighteen stout spines. Meso- and metanotum each with two 

 transverse rows of bristles, the posterior row Avith eight to ten larger 

 ones. Metathoracic epiphysis with three rows of two bristles each. 

 Abdominal tergites each with two rows of bristles, the larger rows 

 with twelve to fourteen bristles each. Hind margin of metanotum 

 with two small teeth on each side, first tergite with two on each side, 

 and second and third tergites with one on each side. Only one well- 

 developed antepygidial bristle occurs on each side, the other two being 

 abortive. Abdominal sternites with two bristles only, on each side. 



Lateral portion of ninth tergite with a thumb-shaped lobe, and the 

 usual two l)ristles over insertion of claspers. The claspers are slender 



