27 
LOUSE OF 'I HE GROUND SQUIRRELS AND CHIPMUNK. 
(Hcematopinus 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 antenna' ; sides slightly 
convex; lateral angles obtuse, without hairs; posterior 
angle acute, and passing well back upon the thorax; an- 
tennae simple, located anterior to the middle of the sides ; 
joints nearly equal in size. Thorax short, convex at 
sides, widest behind, sternal plate uearly circular, sur- 
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, 
hairs long ; some of those on sides and posteriorly very 
long. Males ai.d females are very similar, and distin- 
guishable only by genital armature of male. 
■ i ^ 
Fig. 15. Hccmatopinus tutu- 
ralis : a. dorsal view ; b, head .- c, 
sternal plate: d. poeteri 
e, terminal segments, male: all 
enlarged. (Original.) 
Millimetres. 
Length 75 to . 80 
Width 35 to .40 
Head : 
Length -27 
Width 13 
Thorax : 
Length 13 
Width 18 
Abdomen : 
Length 45 to . 48 
Width 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 
antennae. It differs further from most of the species in the genus in 
having both the auterior 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 MiddendorPs description and figure of H. 
Ueviu8culu8 from Sperynophilus 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 SpermophilusfranJelini and 8, \3-lincatu$ 
at Ames, Iowa. An immature specimen from Tamuu striatu* presents 
the characters of the species so plainly that there can be little doubt 
that it is identical. 
