Texas Jack Rabbit 
43 
inner portion of the buff-tipped hairs is blackish; there is also a 
dense woolly inner coat, nearly white in color; strongly marked 
grayish rump patch. Along the middle of the rump, from about 
the end of the buff color, is a black marking extending to the tail, and 
the upper side of the tail is also black, with just a white edge show- 
ing about it, from the hairs of the under side. Posterior portion of 
ears whitish, with about an inch of black tip ; anterior portion of ear 
mixed black and brown, with buff edge, lined inside with buff hairs; 
pinkish buff pectoral band; buff on feet as in campestris; rest of 
underparts white. Individuals vary somewhat in the depth of the 
color. There is no essential difference between the winter and sum- 
mer coats, and as a matter of fact the Black-tailed Jack Rabbits 
have but one annual moult, which takes place in late summer and 
early fall. 
The profile of the skull is low and flattened ; rostrum long and 
comparatively shallow; posterior portion of postorbital process 
flaring outward and upward, but the upward flare is not as great 
as in campestris, and the process is somewhat narrower than in 
that species; the end of this process approaches closely to the 
frontal, and is attached to it by a cartilage, leaving a rather wide 
oval foramen. 
Distribution. — The Great Plains Jack Rabbit is found from 
northwestern Texas and northeastern New Mexico northward 
through Oklahoma, Kansas, Nebraska, and eastern Colorado, 
touching southeast Wyoming and extreme southwest South Dakota, 
and has also been taken in southwestern Missouri. In Colorado it 
is found east of the mountains, from the north to the south bounda- 
ries of the State, and increasing in abundance as we go south. 
We have no records of the species from west of the foothills or from 
the San Luis Valley. It has a vertical range from less than i,ooo feet 
in Kansas to a little over 6,000 feet at the base of the mountains in 
Colorado. Its zonal range is mainly Upper Sonoran. 
Habits.— As with the White-tailed Jack Rabbits the young 
are born in spring and summer. The only exact data I have 
for Colorado is a female taken April 6, 1905, at Lamar, 
which contained three small foetuses which would not have 
been born until about the first of May. 
Lepus calif ornicus texianus (of or from Texas). Texas 
Jack Rabbit. 
Lepus texianus Waterhouse, Nat. Hist. Mamm., ii., p. 136 (1848). 
