394 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxvii. 



which in most Ceratoj>hyUus species occur" in the same row between 

 the larger l)ristles are here of very unusual size, being nearly half the 

 size of the large bristles. In most other species they are quite incon- 

 spicuous. 



There arc three antop3'gidial bristles on each side, two quite unequal 

 large ones and a small one behind and near the median line. The 

 abdominal sternites are here more heaA'il}' clothed than in an}- species 

 of the genus known to me, and the numl^er of bristles increases cau- 

 dad. There are two or three rows to each sternite, the principal row 

 on the third segment numbering 18 and on the seventh 20. On the 

 eighth sternite the Ijristles are rather short and scattering. 



The style is rather stout with one long apical bristle and several 

 smaller along the sides. The substylar flap has several long bristles 

 at tip and a mass of short stout bristles on lower margin. 



The hind coxa? lack minute teeth on inside. The hind femur has a 

 row of about six bristles on the side. One of the apical spines on 

 joint II of hind tarsus exceeds joints III and IV together. The spines 

 on fifth tarsal joint occur in the typical Ceratophyllus order. Lengths 

 of hind tarsal joints in the projjortions of 20-16.5-7.5-5-10. 



Length, 2.3 mm. 



Male: The male before me is a most extraordinary looking creature, 

 due to a malformation. The upper margin of head is evidently nor- 

 mally flattened in this species as usual in CeratophyJlus.^ but in this 

 specimen is collapsed inward and deeply concave. The upper row of 

 genal bristles is composed of three members. As in most males, the 

 third antennal joint is somewhat extended so that the bristles on second 

 joint are not as long as the third. The genitalia are entirely inclosed 

 from view in this specimen, within the much extended and posteriorly 

 truncated eighth segment which has on its surface a number of long, 

 stout, rather distant bristles. The lateral portion of the ninth tergite 

 * is not lobed above, but is broadh" rounded. ' Tlie upper claspers are 

 long, slightl}' curved sickle fashion, acute at tip, and armed on pos- 

 terior border with about seven bristles. 



Length, 2 mm. Color, rather darker l)rown dorsally. 



ry^6.— Cat. No. 6902, U.S.N.M. 



CERATOPHYLLUS ALASKENSIS, new species. 



Dr. Kellogg presented me with some specimens of a species taken by 

 Mr. McElhaney on Cltellus harroweiuis at Point Barrow, Alaska. 

 This is the farthest north record for the order in America. This 

 species is also the largest one known to occur on any spermophile. 



Female: Head broadly evenly rounded from occiput to mouth, the 

 frontal notch almost wanting. Gena with the usual three heavy bristles 

 below, the upper row represented by one on the margin. The eye is 

 small compared with size of head, and low down. Gena below eye 



