27 
LOUSE OF I1HE GROUND SQUIRRELS AND CHIPMUNK. 
(Hematopinus suturalis, n. sp.) 
Body short, broad; color, golden yellow. 
Head oval, rounded and deflected in front ; a large chit- 
inous ring inclosing the base of the rostrum ; a very dis- 
tinct transverse suture behind the antennz ; sides slightly {16 
convex ; lateral angles obtuse, without hairs; posterior G2), 
angle acute, and passing well back upon the thorax; an- d, 
tenne simple, located anterior to the middle of the sides ; a 
joints nearly equal in size. Thorax short, convex at " 
sides, widest behind, sternal plate nearly circular, sur- At 
YW 
face roughened; anterior and middle legs slender and 
nearly equal in size; claws slender and sharp; posterior 
legs very thick, claw strong and broad. Abdomen short, 
ovate, broadest near the front, sutures inconspicuous, Fic. 15. Hematopinus sutu- 
hairs long; some of those on sides and posteriorly very #8: 4, dorsal view; b, head; e, 
long. Males ard females are very similar, and distin. ‘S‘™™@! Plate; d, posterior leg; 
: : e, terminal segments, male; all 
g y « « . «Ris 
guishable only by genital armature of male enlarged. (Original.) 
Millimetres. 
ILEING (Nes See Geaeoe oboe Aaeee SSE Rn SORE | ae ee ae 75 to .80 
\WIE o See e e SOG OSs oS OS BSS ee eee ae .35 to .40 
Head: 
aA a ee ee ec ayrio foo nios sande es 5j05 mins eles emce cote 27 
\WWiidlijil. 223 :as0 Cocebee peat ns oo Bee nee ee ee 13 
Thorax: 
UGG SS Od 46 AS eo ee ae ee aes 13 
\NAIGUTD oo Sa3 5.72 SGC Sao See SOE ta aes ee .18 
Abdomen : 
MB aera Ae ae nines Sars Soe oblsis odes ~ Sts sss ocleses saitsinceee, 400 maS 
WG 4 Go aante SS Gnecoo Sse eae eee ceicees cee « 35 to .40 
This species is particularly well marked by the general form of the 
body and especially by the conspicuous transverse suture back of the 
antenne. It differs further from most of the species in the genus in 
having both the anterior and middle legs slender and of nearly the 
same size, while the posterior legs alone are especially modified as 
clasping organs. 
Although we have not seen Middendorf’s description and figure of H. 
leviusculus from Spermophilus eversmanni, there can be scarcely a possi- 
bility of this being identical with it, since this differs in almost every 
particular as compared with the diagnoses of that species given by 
Giebel and by Piaget. We therefore describe it without hesitation as a 
new species. 
It has been found plentiful on Spermophilus franklini and S. 13-lineatus 
at Ames, Iowa. An immature specimen from Tamias striatus presents 
the characters of the species so plainly that there can be little doubt 
that it is identical. 
