402 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxvii, 



CERATOPHYLLUS LABIATUS, new species. 

 Plate XIX, figs. 6-9. 



Of several species which Professor Aldrich found on Lynx cana-. 

 densis at Moscow, Idaho, this is the most puzzling-. It is represented 

 by only one female. Probably its normal host is not Ly7ix, but some 

 one of the small rodents inhabiting- that region. 



Head rounded, with an unusually even, rather strong-, curve from 

 occiput to mouth. Frontal notch minute. Gena with the usual lower 

 row of three stout ])ristles, the middle liristle smaller. The second 

 row is represented by a single small bristle a])ove upper bristle of 

 lower row. A few small hairs occur above the rather elliptical eye. 

 Gena below eye truncated posteriorly. Antennal groove extending 

 to two-thirds the depth of the head, with a few hairs scattered along 

 its hind margin, these hairs being longer below. The second joint of 

 antenna^ has about five bristles which extend beyond the apex of the 

 third. On the disk of the vertex behind the middle of the antennal 

 groove occurs one large, stout spine and two far smaller ones. Hind 

 margin of head with the usual bristles, but at each inferior angle 

 there are two, the lower of which is smaller. The labial palpi are 

 very slender and about equal anterior coxte. 



Pronotum with two rows of bristles — about twelve on the posterior 

 third, about eight on the anterior third, and on the hind margin a 

 ctenidium of about eighteen spines. Meso- and metanotum with two 

 rows of bristles each, the posterior row having about ten bristles. 

 Metanotum and first three abdominal tergites each with a small tooth 

 on either side of hind margin. Metathoracic epiphysis with four 

 bristles, two large and two small. Abdominal tergites each with two 

 rows of bristles, the posterior of about fourteen larger ones, the ante- 

 rior of fewer and smaller bristles. Middle abdominal sternites each 

 with a row of eight long, strong- bristles. The last few sternites are 

 provided with second rows of smaller bristles. The antepygidial bris- 

 tles are ver}^ strong and three in number on either side, the longer 

 middle one in each group extending- be^^ond the pygidium. 



Beneath the pj^gidium on either side stand three bristles in a perpen- 

 dicular row. The vestiture of the end of the abdomen is rather heavy. 

 Style somewhat more than twice longer than wdde at base and narrowing 

 to a point where there is a long apical bristle. Back of apex below is 

 inserted another smaller bristle. The substylar flap is obtuse, with 

 two long bristles near the apex and four or five short, stout ones on 

 the lower margin. The lower lateral portion of the eighth segment 

 bears a number of normal bristles and also about seven short, stout, 

 dark-colored bristles which are almost spines, in this latter respect 

 difi'ering widely from anj^ nearly related species. 



