a 
25 
LOUSE OF THE FOX SQUIRREL. 
(Hematopinus antennatus, 1. sp.) 
Body long and slender, the abdomen proportion- 
ately large. 
Female.—Head narrow and rounded in front, widen- 
ing decidedly behind the antennew, deeply hollowed 
beneath the lateral margin, the postero-lateral margin 
sub acute, bearing ashort spine-like hair and a long 
stiff hair, 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- 
tenne. Antenne 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 
posterior pairstrongest. 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 : 
of the eighth segment. Egg elongate ovate, surface _ F!6:18-—Haematopinus antennatus : 
. a, dorsal view ; b, head, ventral view; 
smooth throughout except at the cap, which is, antenna; d, leg; e, sternal plate; /, 
strongly convex and has a row of perforations near egg; allenlarged. (Original.) 
the attachment to the body of the sheli. 
Millimetres. 
Mem ethiee seven fas se(c/iatvo c Sa ee e asthe e lwe eevee oneseee 1.55 to 1.65 
AWHCUG Mee sores tee Shes cia eco oeloe ae aetmacloa sunk sce meer .00 
Head : 
WMOmect Diem tastoc Se dicta cate age mege to ayaeseree aa ee ae 30 
VG Gu Gl itera steweter sane cy aia) si arc so sets: Seen sy ete cee oan 20 
Thorax : 
Wenmtteecmiiccc ante iccaae Sete eee eee oe Oe een 13 
Wal GG Wetane ope eratmiciets soi. « = cist ania aero ane eee 22 
Abdomen : 
Hen Other ecjenten's cb Sec ewetes se cewiont Reames 1.20 
Wald G Dieses ar seion = ciso eis: Sajna Saale bee Ss SOREN a olen es, 50 
REHM ee MON OGM e ea a inlets only so cee eee toe econ a aces .20 
Egg: 
hen tlhsere are mee cok tS eis wo thee epsoae eee esac 73 
AVA Cb Nieerate ieee icictin cane a emo me eae eae mee 28 
This species is at once distinguished from all others, known by the 
peculiar structure of the antennz, no other species described possess- 
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, Sciwrus cinereus var. ludovicianus, 
at Ames, Iowa. 
