HEMIPTERA. 185 
_ gate, sparsely set with short spiny hairs, one or two long hairs at lateral angles of 
sixth and seventh segments. 
Male, more slender, head longer and tapering somewhat 
toward the front. (See fig. 108.) 
Egg, as seen in the body of adult female specimen, is 
elongate oval. 
Length, 0.75 to 0.90; head, 0.13 to 0.16; thorax, 0.10; 
abdomen, 0.50 to 0.60 mm. Width, 0.28 to 0.33; head, 0.10; 
thorax, 0.13 to 0.15; abdomen, 0.28 to 0.33 mm. 
This species approaches the acanthopus, resem- 
bling it in the form of the sternal plate, the char- 
acter of the legs, and the general form of the body. 
It differs, however, in having the sternal plate less 
narrowed posteriorly, more obtuse, or even trun- pig. 108. — Hematopinus 
cated in front; more decidedly still in the form of — *speromydis: a, dorsal 
, A ~ view; b, head; ec, sternal 
the head, which is longer and less excavated for _jjate. a, posterior leg: ¢. 
the insertion of the antenne. It is also smaller, _ terminalsegments,male— 
and the egg, if we may judge by what we can see SLO amerea os 
through the walls of the female, is more elongated. 
It has been collected from the white-footed or deer mouse ( Hesperomys 
leucopus) at Ames, Towa. 
LOUSE OF THE GROUND SQUIRRELS AND CHIPMUNK. 
(Hematopinus suturalis Osborn. ) 
- Body short, broad; color, golden yellow. 
Head oval, rounded and deflected in front; a large chitinous ring inclosing the 
base of the rostrum; a very distinct transverse suture behind the antennz; sides 
slightly convex; lateral angles obtuse, without hairs; 
_ posterior angle acute, and passing well back upon the 
thorax; antennz simple, located anterior to the middle 
of the sides; joints nearly equalin size. Thorax short, 
convex at sides, widest behind, sternal plate nearly 
circular, surface 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 and females are very 
similar, and distinguishable only by genital armature 
Fic. 109.—_Hematopinus sutur- 
4 eee ie i, of male. 
alis: a, dorsal view ; b, head; ¢, ¥ y o7. are Ps : 
SNGAE bixia; d, posterior log, Length, 0.75 to 0.80; head, 0.27; thorax, 0.13; abdo 
e, terminal segments, male— ™€N, 0.45 to 0.48 mm. Width, 0.35 to 0.40; head, 0.13; 
all enlarged (author's illustra- thorax, 0.18; abdomen, 0.35 to 0.40 mm. 
tion). Z A - 
This species is particularly well marked by 
the general form of the body and especially by the conspicuous trans 
verse suture back of the antenne. It differs further from most of 
the species in the genus in having both the anterior and middle leg 
slender and of nearly the same size, while the posterior legs alone ar* 
especially modified as clasping organs. 
