NO. 13C1. UEVISION OF AMERICAN SIPHONAPTERA—BAKEB. 415 



sido, iuid this extt'iids to th(' apex of the ;d)d()in(Mi; the othci- Iwo l»ris- 

 ties iioniiully occin'iiiii;- in each oroup are here reduced to niimite 

 hairs. The eig"hth seument on either side bears about three rows of 

 four or tive stout bristles each. Lateral poi'tiou of uintii termite with 

 the apical lobe short, very nuich broadened at base, and w'ith a few 

 weak hairs at tip. The upper claspers resemble those of tiihci'ftidntn.s. 

 The ventral style has several very long, rather stout bristles. 



Length. 2.5 mm. Color, clear browji. 



%>>.— Cat. No. 6!»1S, U.S.N.M. 



CERATOPHYLLUS ARIZONENSIS Baker. 



Plate XXIII, fig. (), and I'late XXIV, figs. 8-12. 



This species was l)ased on a single male specinuMi taken by Mr. 

 Hubl)ard from the ne.st of Neotomna ((JJitguht at Tucson, Arizona. 

 Additional structural details are brought out in the figures and 

 sjMiopsis. 



CERATOPHYLLUS PETIOLATUS, new species. 

 Plate XVIII, figs. 7-lL 



This is one of several peculiar things which Professor Aldrich found 

 on Lynx canadensis at Moscow, Idaho, though its occurrence on that 

 host is undoubtedly wholl}^ fortuitous. It but still more emphat- 

 ically indicates the great need of a careful collection of the species 

 normal to the many small rodents. This species is closely related to 

 Arizmiensis. It is represented in the collection by one male speci- 

 men. I at first took it to be the male of tuhereulatus^ but the far 

 greater length of labial palpi and mandibles in the latter species, 

 togetlier with other minor differences not considered sexual, make 

 such a reference impossible. 



Head flattened above as usual. The frontal notch is prominent, 

 somewhat as in tuherculatus. Gena with a normal lower row of three 

 ))ristles, the upper row represented by one bristle on the lower mar- 

 gin of head and one near the antemial groove. Gena below" the eye 

 obtusely pointed posteriorly, Antennal groove nearly reaching the 

 upper margin of the head, its hind margin with a scattering row of 

 minute bristles slightly back from the edge. Second joint of antennie 

 with seven or eight ])ristles which are nearly as long as the third joint. 

 On the disk of the vertex back of the middle of the antennal groove 

 there is one stout bristle. On the hind margin of the head occur the 

 usual bristles, with one long, stout one at each lower angle. The labial 

 palpi extend to the end of the anterior coxaj. 



The pronotum has a transverse row of about fourteen bristles on 

 the posterior third and on the hind margin a ctenidium of al)out 

 twenty stout spines. The meso- and metanotum e:ich have two row^s 

 of bristles, the posterior row in each case of twelve or fourtetMi stouter 



