zo 
LOUSE OF THE FOX SQUIRREL. 
(Hcematopinus antennatus, n. sp.) 
Body long and slender, the abdomen proportion- 
ately large. 
Female.— Head narrow and rounded in front, widen- 
ing decidedly behind the antenna-, deeply hollowed 
beneath the lateral margin, the posterolateral margin 
sub acute, bearing a short spine-like hair and a long 
stiff ha ir,'the posterior border with an acute angle be- 
hind; beneath broadly keeled, keel behind narrow, 
expanding in front to width of head between the an- 
tennae. Antenna- very different from other members 
of the genus : the first joint large with a short process 
on the posterior border bearing a sharp inwardly 
curved tooth ; other joints ordinary, second joint 
longest. Thorax short, widest behind, sternal plate 
ovate, broadest in front, legs as with allied forms, the 
posteriorpairstrongest. Abdomen long, lateral angles 
produced, bearing a short spine or tooth, a short stiff 
hair and a long hair : a tuft of hairs on lateral angles 
-,,.,*•, ' 4. r? 1 l r Tig. Yi. -Haematopiaus antennatuf ■. 
of the eighth segment. Egg elongate ovate, surface , , . . , , , 
00 00 o 1 a, dorsal view ; b, bead, ventral view: 
smooth throughout except at the cap, which is c antenna: (?i i e g ; e, sternal plate; /, 
strongly convex and has a row of perforations near egg; all enlarged. (Original.) 
the attachment to the bodv of the shell. 
Millimetres. 
Length 1.55 to 1.65 
Width .50 
Head : 
Length .35 
Width .20 
Thorax : 
Length .13 
Width .22 
Abdomen : 
Length 1.20 
Width .50 
Antenna-, length ( .20 
Egg: 
Length .73 
Width .28 
This species is at once distinguished from all others, known by the 
peculiar structure of the antenna*, no other species described pos- 
ing the process and curved tooth of the basal joint. In form of head 
it approaches acanthopus, but is larger than that species and has the 
sternal plate of different forms. The egg is longer, more attenuated in 
form at base, and devoid of the surface markings characteristic of that 
species. Collected from a fox squirrel, Sciurus cinereus var. lurtovicianus, 
at Ames. Iowa. 
