No.l3(il. REVISION OF AMERICAN SIPIIOXAPTERA— BAKER. 403 



Hind coxae without minute teeth inside. Hind femora with one 

 minute bristle on the .side, and the h^wer thin margin, which usually 

 occurs onl}' near apex, is in this case extended to tlie l)as(". Apical 

 spines on second joint of hind tarsi all shortei- than third joint. First 

 pair of spines on the fifth tarsal joint strongly dislocated toward middle 

 and turned straight distad. Length of hind tarsal joints in the i)ro- 

 Dortion 19-13-8-5-7. 



Length, 2.0 mm. Color, clear brown. 



Type.—OAt. No. 0909, U.S.N.M. 



CERATOPHYLLUS WICKHAMI Baker. 

 Plate XXVI, lig.s. 1-7. 



Later studies have convinced me that the three squirrel tieas which 

 were described b}^ me in the "Preliminary Studies" are one and the 

 same. The}^ were separated on characters, the value of which, at that 

 early stage in the work and without precedent to follow, was impos- 

 sible to correctly estimate. The above name, having priority over the 

 others, is the one to be used. This name was originally applied to speci- 

 mens taken from Sciuwpteras solans at Iowa Citv, Iowa, ])y Mr. H. F. 

 Wickham. There are now in the collection specimens from fox squir- 

 rel taken in Indian Territory (W. W. Cooke); from gray squirrel taken 

 in Santa Cruz Count}^, California (Edward Ehrhorn); from Pnxjne 

 subis at Wellesle}^, Massachusetts (A. P. Morse — and this occurrence 

 unquestionably accidental); from Peromyscus at Franconia, New 

 Hampshire (Mrs. A. T. Slosson), and from Arctomys mo)iax at New- 

 port, Herkimer County, New York (D. B. Young). 



A very conspicuous and constant character is found in the armature 

 of the upper claspers of the male. The four black teeth occurring 

 there are thoroughly diagnostic. Other details not given in the 

 original description ma}^ be had from the synopsis and figures. 



CERATOPHYLLUS SEXDENTATUS, new species. 

 Plate XXVI, tigs. 8-14. 



A species very close to mickhami^ and yet conspicuously distinct, is 

 sent from Boulder Creek, California, where it was taken from Neotoma 

 by Mr. Edw^ard Ehrhorn. Mr. Ehrhorn tells me of finding with this 

 a species of great size, ])ut I have not seen it. 



Female: Upper margin of head rapidh' sloping forwaid from occi- 

 put, but rather strongly rounded in front. Frontal notch very incon- 

 spicuous. Lower row of genal bristles consisting of three, the middle 

 smaller; the upper row of three or four small bristles is ver}' oblicjue 

 and not extended farther cephalad than above middle bristle of lower 

 row. Several minute hairs occur a))ove the rather small ovate eye. 

 Antennal groove extending to two-thirds the depth of the head, the 



