428 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxvu. 



group of several \ox\g, and several short, stout bristles. One stout 

 bristle occurs beneath the pygidiuni on cither side. 



The style is very long, about five times as long as broad at base, 

 nearl}^ cylindrical, except at the tip, where there is a weak bristle, 

 back of which are about six bristles irregularly placed. Substylar flap 

 with numerous short, stout bristles above and three very heavy ones 

 on the lower margin. 



The hind coxal epiphysis slopes gradually into the coxa distally, 

 thus not forming any emargination. The hind femur is without minute 

 bristles on side. Hind margin of hind tibia with a))out six distant 

 longer inner spines and about twelve shorter close-set inner ones. 



First joint of hind tarsi without paired spines on hind margin, but 

 with a double row of numerous spines. Bristles on apex of second 

 hind tarsal joint shorter than third joint. The first pair of spines on 

 tifth tarsal joint is dislocated toward median line and directed straight 

 caudad. 



Length, 2.5 mm. 



Male: Head nearh^ as in the female, but the antennal groove extends 

 to its upper margin. The two outer in each group of aiitepygidial 

 bristles somewhat reduced. The last live abdominal sternites only, 

 have rows of six l)ristles each. 



The lateral portion of ninth tergite is without a lobe on the upper 

 margin. The upper claspers are long, narrow, subrectangular, curved 

 backward a little, and with two l>laclv teeth at the upper posterior angle. 

 Lower claspers witii a short, stout, black, recurved spine on hind 

 margin. 



Length, 1..5 mm. 



CTENOPSYLLUS HESPEROMYS, new species. 



There is in the collection a Cten(>2»<yll((>< taken at Franconia, New 

 Plampshire, on Peromy.'icus, by Mrs. A. T. Slosson, which represents 

 a very distinct species in tiuit it possesses a ctenidium of two spines 

 on either side of the head. 



The upper margin of the head is very gradually rounded from the 

 occiput to the frontal notch, thence curxed downward and l)ackward 

 to the mouth. The antennal groove is m:irgined ))y chitinous thicken- 

 ings above and is narrowed to the upper margin of the head, where it 

 joins the groove of the other side. The marginal row of bristles usual 

 to this genus occurs on either side of the head; from the frontal notch 

 to the mouth these bristles are short and heavy and spine-like; from 

 the frontal notch to the occiput thej^ are much longer and bristle-like. 

 The upper row of genal bristles is represented by two placed high up; 

 below this is a row of three bristles, two of which are very strong — 

 one over eye, the other considerably above lower margin of head. 

 Beneath the eye on either side, standing in a vertical row, are two 



