382 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxvii. 



margin over the maxilla. The vertex possesses the usual row {ten to 

 twelve in this case) of bristles near hind margin, but they are gradu- 

 ally enlarged from above to the ver}' large one at lower angle. Disc 

 of vertex with two medium-sized spines back of middle of antennal 

 grooves, one below and posterior to the other. Gena below eye not 

 laminatel}" projecting over antennal groove. Bristles on second joint 

 of antenna? considerablv exceeding third joint. In both sexes the 

 antennal groove is connected b}' a chitinous thickening with the upper 

 margin of the head. Hind margin of antennal groove with only two 

 small bristles l)elow. Mandibles reaching scarcely half of anterior 

 coxj^?. Maxilhe short, but long acuminate at apex. 



Fore coxw with comparatively few rather large spines. On inner 

 side of hind eoxa there is an oblique row of ten to twelve minute 

 teeth. Hind femora with a row of six to eight bristles on the side. 

 One of the apical spines on joint 2 of hind tarsi is longer than joints 

 3 and 4 together. The proportional lengths of hind tarsal joints are 

 about 150-16-8-5-13. Eighth abdominal segment in both male and 

 female laterally with two stout spines on each side. In the female 

 the eighth tergite is clothed on hind margin laterally with muuerous 

 spines and bristles. The tenth tergite has two long apical spines and 

 back of this several shorter. The style is very short and thick, 

 somewhat narrowed apically, with one stout apical spine and two 

 smaller spines back of apex beneath. 



In the male the lateral portion of the ninth tergite is a large sclerite, 

 rounded only a])ove, with a stout tooth at posterior upper angle and 

 numerous bristles along the upper margin. The upper claspers are 

 of an elongate inverted plowshare shape, with the point dissected 

 cephalad and with a few weak hairs on posterior border. 



Length of male 1.5 mm., female 2.5 mm. Color, very dark reddish 

 brown. 



Tyj)e.—C^t. No. 6897, U.S.N.M. 



PULEX AFFINIS, new species. 



Prof. A. B. Cordley collected on a small Lepus, near the Grand 

 Canyon in Arizona, two perfectly distinct species of fleas, one a Pulex^ 

 the other a Otenoce2>halus, both represented by males and females. 

 However, (7/«c?'a//.S' represents a general type like avium^fasciatus^ etc., 

 from which in late years many perfectly distinct forms have been 

 separated. So it becomes necessary to give this the standing of a sep- 

 arate species. So very little is known of the fleas living on rabbits 

 and hares in America, especially in northern North America, that 

 nothing further can be said at present than that this is a relative of 

 glacial i'f. 



The pronotal ctenidium contains 16 to 18 spines. Abdominal seg- 

 ments, each with but one transverse row of bristles, about 14 in each 



