NO. 1361. REVISION OF AMERICAN SIPIIONAPTERA— BAKER. 411 



Hind coxii without iiiiiuitc teeth inside. Hind t'eiuur with one 

 niiinite ])ristle on side. Spines on apex ot" second hind tarsal joint 

 siiorter than third joint. Tliird joint of hind tarsi with two o-roups 

 of spines on eitlier inari>in. First pair ot" spines on hist joint of 

 hind tarsi inserted on a \mv, with the others. l)ut soniewliat Ijent 

 inward. Len^-th of hind tarsal joints in the propoi'tions 20-13-8-5-9. 



Length, ?> mm. Color, dark, almost blackish, brown. 



Male; Head Hattened al)ove as usual. The o-enital organs are very 

 similar in structure to those of vison. Length, '2. '25 nun. 



Type.—CAt No. 0915, U.S.N.M. 



CERATOPHYLLUS MONTANUS Baker. 



Plate XXII, figs. 7-8, imd Plate XXIII, lig.s. 1-5. 



Originally taken from the gra}' sc^uirrel in the northern Colorado 

 mountains; this species has since been found in southern Colorado and 

 in Arizona. In southern Colorado, at Arboles, I found it abundant 

 on Rock Sc{uirrel, and in Arizona, Hubbard collected a series on Rock 

 Squirrel in the Santa Rita Mountains. In addition to the original 

 description, further details are indicated in the accompanying figures 

 luid synopsis. 



CERATOPHYLLUS ARCTOMYS, new species. 

 Plate XXII, figs. 1-6. 



At Peterboro, New York, Mr. Gerrit S. Miller, jr., of the U. S. 

 National Museum, has collected a large and distinct species, on Are- 

 tomys Tnonax^ which is related to montamLS, possessing like it the 

 greatly elongated mouthparts. but differing in the much greater size 

 and various details. 



Female: Head with a rather broadly evenl}'^ rounded outline above, 

 the frontal notch distinct. The gena with two oblique rows of bris- 

 tles — three in each. A few minute hairs occur a})Ove the small oval 

 ej'^e. Gena below eye truncate posteriorly. Bristles on second joint 

 of antenna" exceeding third joint. Hind margin of antennal groove 

 lined with a nvunber of small hairs. On disk of vertex, back of mid- 

 dle of antennal groove, stands a single large stout bristle. Hind mar- 

 gin of head with two or three bristles above; somewhat above lower 

 angle occurs a large, long ])ristle, l)eneatli whicii stands one or two 

 small supernumerary bristles. The labial pal})! extend neaily to end 

 of anterior femora. 



Pronotum with a transverse row of about fourteen ))ristles on pos- 

 terior third and on hind margin a ctenidium of eighteen or twent}' 

 stout spines. The anterior row of bristles on meso- and metanotum 

 contains about ten small bristles; on mesonotum posteriorly there is a 

 row of about twelve larger bristles, and on metanotum a row of sixteen. 

 On the hind margin of the metathoracic epiphysis stands one large 



