SIPHONAPTERA. ‘149 
There are no spines upon the head, but a comb of 18 spines is on 
the pronotum. The male claspers are armed with short, black teeth 
which very readily separate this species from its nearest allies. 
Specimens from fox squirrel, Caddo, Ind. T., sent tome by Prof. W. 
W. Cooke, probably belong to this species, as Baker mentions several 
specimens in my collection without host, and as several of these speci- 
mens were sent him the labels of which may have been lost. The speci- 
mens being remounted I can not positively recognize them now. 
Baker also describes Pulex wickhami from the flying squirrel ( Sciu- 
ropterus volans), at Iowa City; Pulex gillettei from the red squirrel 
(Sciurus canadensis), Portland, Mich.; Pulex coloradensis from Fremont’s 
chickaree, Georgetown, Colo.; Pulex hirsutus, from prairie dog (Cynomys 
di i stein 
ek 
\ 
Fia. 81.—Pulex howardi: a, female; b, genitalia of male—greatly enlarged (original). 
ludovicianus), Stove Prairie, Larimer County, Colo.; P. longispinus, 
from Fremont’s chickaree, Colorado, and Pulex montanus, from the large 
gray squirrel (Sciurus alberti), foothills west of Fort Collins, Colo. 
THE SPERMOPHILE FLEA. 
(Puiex bruneri Baker. ) 
The common spermophiles, Spermophilus 13-lineatus and S. franklini, 
are very commonly infested with a large reddish-brown flea which has 
been recorded so far from Lincoln, Nebr., and Fort Collins, Colo., as 
well as Ames, lowa, where I have taken it frequently during a number 
of years past. 
The head is without spines beneath, but the pronotum bears a comb 
of about 16 spines. Baker describes it as follows: 
Apical spines on joint 2 of hind tarsi long as joints 3 and 4 together; antennal 
groove in middle of head; maxillary palpi in female with joint 2 three-fourths of 4, 
and 3 two-thirds of 4, labial palpi reaching to one-third of anterior femora; pro- 
notal comb of 16 spines; in anterior tarsi joint 2 longer than 1 and one-third longer 
than 3; in middle tarsi joint 1 equals 5 and 4 together and shorter than 5, while 5 is 
