THE BLACK-LEGGED TICK. 17 
Nymph (P1. V, fig. 4) —Unengorged, 1.5 by 0.75 mm.; engorged, 
from 2.3 by 1.5 by 1.25 mm. to 2.7 by 1.5 by 1.25 mm. Color, 
unengorged, dark smoky brown, shield and capitulum nearly black, 
legs lighter; engorged, dark bluish gray. Capitulum 0.317 mm. long 
(from tip of palpi to postero-lateral angles of basis capituli); scutum 
0.586 mm. long by 0.491 mm. wide. 
Larva (Pl. V, fig. 1)—Unengorged, from 0.616 by 0.371 mm. to 
0.746 by 0.474 mm.; engorged, 1.28 by 0.76 mm. to 1.4 by 0.9 mm. 
Color, unengorged, smoky brown; scutum, capitulum, and legs 
somewhat darker than body; engorged, slate-gray to black. Capi- 
tulum 0.222 mm. long (from tip of palpi to base of emargination of 
shield); scutum 0.297 mm. long by 0.304 mm. wide. 
Egg.—Size, about 0.445 by 0.386 mm. ; light brown, shining, smooth. 
HOST RELATIONSHIP. 
No type host was given by Say when he described this species. In 
certain sections of the South it occurs in considerable numbers on the 
dog and on cattle. The species has also been recorded from the deer, 
sheep, horse, and, in the immature stages, from birds, including 
the quail, blue jay, and thrush. One of the writers has found this 
tick to be common on the dog at Hawthorn, Fla. Mr. W. W. 
Yothers collected a number of adults on dogs at Orlando, Fla. Both 
sexes were collected from an opossum at Hawthorn, Fla., and at 
Tanglewood, Tex., Mr. C. T. Atkinson took a partially engorged 
female on that host. 
GEOGRAPHICAL DISTRIBUTION. 
(Fig. 3.) 
No type locality was given for this species by Say, who described it. 
It appears to have been collected from Maryland south to Florida, and 
in the Central States from Indiana, Iowa, and Missouri, as well as in 
_ Louisiana and Texas. A male specimen recorded from Pennsylvania 
an 
by Neumann may prove to be this species. Some 12 female speci- 
mens collected from Felis pardalis in Costa Rica and determined by 
Neumann as Jzodes affinis have been identified by Mr. Nathan Banks 
as I. scapularis. Mr. E. A. Schwarz took a male and female when he 
was beating hanging vines in heavy timber, a short distance west 
of Tampico, Mex. 
LIFE HISTORY. 
But little has previously been published on the biology of this 
species. 
The egg—Two engorged females which were collected at Haw- 
thorn, Fla., on December 21, 1907, and sent to the laboratory, com- 
menced depositing, one on January 5, the other on January 6; 15 and 
