52 NORTH AMERICAN FEVER TICK AND OTHER SPECIES. 
They suggest the possibility of disease being transmitted by it. The 
specimens in the Bureau of Entomology collection from Nebraska 
were taken on the beaver. 
TROPICAL HORSE TICK. 
(Dermacentor nitens Neumann. ) 
This species is readily distinguished by the,characteristic structure 
of the stigmal plate. (See Pl. IV, figs. 1, 2, and text figs. 5 and 6.) By 
collections by Mr. 
J. D. Mitchell from 
the ears of horses at 
Brownsville and at 
Harlingen, Tex., this 
species has been 
added to the list of 
ticks found in this 
country. The spe- 
cies was described 
by Neumann in 
1897 from specimens 
in the Marx collec- 
2 & tion, locality un- 
Fig. 5.—Dermacentor nitens: Capitulum of female. Greatly enlarged known, and from 
(original). 
ra 
4, 
a) 
Kare 
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SHS 
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SS 
SG 
FN 
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specimens from San 
Domingo and Jamaica on the horse. In 1901 Neumann listed it 
from Guatemala, Venezuela, and Porto Rico. 
A single specimen, appar- 
ently of this species in the 
nymphal stage, was taken at 
Kerrville, Tex., by Mr. F. C.: 
Pratt from a deer skin that 
had been removed in January. 
Genus HE MAPHYSALIS. 
The ticks belonging to this 
genus may be readily recog- 
nized by the presence of con- 
spicuous lateral prolonga- 
tions on the second palpal 
segments. The eyes are ab- 
sent; the coxe of the male 
are all provided with spines, 
those of the female withsmall]l F16- 6.—Dermacentor nitens: Coxe of male and female. 
' Greatly enlarged (original). 
tubercular processes. Neu- 
mann mentions two species from North America, H. leporis-palustris 
