410 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxvii. 



lenj^th of the lobe of the ninth tergite. The upper posterior angle of 

 claspers is rounded and with two slender l)ristles; below this angle 

 stands a short, stout, dark-colored, downward-curved bristle, while 

 another like it also occurs at the roundly, slightly extended lower 

 angle. Length, 2.5 mm. 



Type.— C?it. No. 6914, U.S.N.M. 



CERATOPHYLLUS LUCIDUS, new species. 

 Plate XX, figs. 5-9. 



While camped near Pagosa Peak, in southern Colorado, during 1899, at 

 an elevation of about 9,000 feet, I found that the little spruce squirrels 

 so abundant there were conmionly infested with a flea which diifers 

 from any of the other squirrel fleas, though closel}" related to vison. 



Female: Margin of head above stronglv and evenly rounded from 

 occiput to mouth. The frontal notch is inconspicuous. Of the bristles 

 in the lower row on gena the middle one is smallest. The upper row 

 consists of about five bristles, and extends from the antennal groove to 

 the lower margin of the head. Gena below eye broadly subtruncate 

 posteriorly. Above the strongly ovate eye are a few minute hairs. 

 The antennal groove extends to two-thirds the depth of the head, and 

 is somewhat narrowed below, the hind margin with a very few minute 

 hairs above and below. First antennal joint with a few short hairs 

 near the apex, the second joint having about five bristles, which are 

 shorter than third joint. On the disk of the vertex back of the middle 

 of the antennal groove occurs one stout bristle and two smaller ones. 

 Hind margin of head with the usual bristles, and also with a small 

 supernumerarj' bristle beneath the large one at each lower angle. 

 Labial palpi equaling or a little exceeding the anterior trochanters. 



Pronotum with a transverse row of about ten bristles on the pos- 

 terior third, and on the hind margin a ctenidium of about sixteen 

 stout spines. Meso- and metanotum posteriorly each with a row of 

 about ten stronger bristles, anterior to which is a row of fewer smaller 

 bristles. Metathoracic epiphysis with one large ])ristle on the hind 

 margin, one large and two small bristles in front of this, and two still 

 smaller in front of the latter. Metanotum and first three al^dominal 

 sternites each with a small tooth on either side of hind margin. 

 Middle abdominal tergites each with a row of about twelve larger 

 bristles, and anterior to this a row of fewer smaller liristles. Sternites 

 each with a row of six to ten bristles. Antep3'gidial bristles three on 

 each side, the central one in each group about twice longer than the 

 others, but scarcely projecting beyond the pygidium. Below the 

 pygidium on each side occur two bristles. 



Style short and stout, not twice longer than wide at base, narrowing 

 to the apex, where there is a long bristle; proximad of the apical 

 bristle occurs one on upper and another on lower margin. 



