408 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxvii. 



first abdominal tergite with one, second with two, and third with one, 

 on either side. Abdominal tergites each with two transverse rows of 

 bristles, the posterior row of about fourteen stouter, the anterior of 

 fewer and nuich smaller, while still in front of these latter may be 

 found a few scattering bristles. Abdominal sternites each with al)out 

 five bristles on either side. Antepygidial bristles three on each side, 

 the middle one of each set longest, reaching over pygidium, the inner 

 smallest. Below the pygidium laterally are two stout bristles. Hind 

 margin of eighth segment laterally narrowly rounded and lined by 

 about eight stout bristles. 



Stj'le stout, twice longer than wide at base, narrowing to the apex 

 where there is a long bristle; proximad of apical bristle on under side 

 is a smaller bristle. 8ul)stylar flap obtusely pointed, with some long 

 bristles near the tip and a brush of shorter stouter ones on the lower 

 margin. 



Hind cox5\? without minute tec^tli on the side. Hind fenuir with a 

 longitudinal row of five or six small bristles on the side. Apical 

 spines on second joint of hind tarsi shorter than the third joint. 

 Third hind tarsal joint with but two groups of spines on each side. 

 Fifth hind tarsal joint with first pair of spines inserted nearly in a 

 line with the others, but bent inward. Joints of hind tarsi slender, 

 their lengths in the proportion 22-14.5-9.5-5-9. 



Length, 3 mm. Color, clear brown. 



Type.^Cat No. <)913, U.S.N.M. 



CERATOPHYLLUS VISON, new species. 



Mr. Gerrit S. Miller jr., took this species on Patorius tyison at Peter- 

 boro, New York. Prof. F. L. Harvey also found one specimen of it 

 at Orono, Maine, on jSeiwrus hudso7iieus. It is closely I'elated to 

 other squirrel fleas, but a greater number of specimens were taken 

 from Put<)r!u)<!. In this, as in some other cases, only a num])er of 

 observations will determine the normal host. The specimens from 

 Putorliis furnish the types. 



Female: Upper margin of head evenly rounded from occiput to 

 frontal notch, which is rather low down on the front. The middle 

 bristle in the lower row of three on gena is nearly as stout and long 

 as the upper one. The upper ol)lique row of five small bristles 

 extends from the margin of antennal groove to the lower margin of 

 the head. A few minute hairs occur above the oval eye, which is of 

 medium size and rather low down in the head. Gena below ej^e sud- 

 denly narrowed posteriorly from the rather broad portion innuediately 

 below eye to a somewhat acute point. Antennal groove extending 

 to two-thirds the depth of the head, and but slightly narrowed })elow, 

 its hind margin prominent and with scattering minute hairs. The 

 first antennal joint with several transverse rows of minute hairs; the 



