284 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
B. Hind feet not longer than the head. Size small. Postorbital processes 
convergent, frequently (in old specimens) in contact with the 
skull posteriorly, but only rarely anchylosed with it. Pelage 
never white. 
4. Gray above, varied with black, and more or less tinged with light 
yellowish-brown ; under parts white....---------- sylvaticus. 
4a. Above yellowish-brown, with a tinge of reddish, var. sylvaticus. 
4b. Paler, rather smaller, with slightly larger ears, and rather stouter 
lower jaW.2 2). s2- 2 eee ree eee var. Nuttalli. 
4c. Color nearly as in var. sylvaticus; ears rather longer and more 
distinctly, black-tippeds’-2h 52 2= =e eee var. Auduboni. 
Ad. Like var. Nuttalli, but paler, and with considerably longer 
GANS cc 2 oh hse ee ee ee ee var. arizona. 
5. Smaller than sy/vaticus, with the postorbital process scarcely touching 
the skull posteriorly. Colors generally more finely blended, and 
darker. Tail very short, almost rudimentary... - - Trowbridget. 
6. Above gray, varied with black and pale yellow. Size of Trow- 
bridgei, with the colors and sparsely-clothed feet of palustris. 
Tail very short, yellowish-brown below...-..------ brasiliensis. 
7. Size of sylvaticus, with the coloration much as in brasiliensis. Tail 
white below. Feet sparsely haired, as in L. palustris. .Graysoni. 
II. Skull less convex above; breadth considerably less than half the length ; 
length of nasals more than four-fifths the width of the skull. 
Ears and hind feet longer than the head. Postorbital processes 
convergent, touching the cranium behind. Pelage never white. 
Tail long, black above, this color extending forward on the 
rump. 
A. Lower jaw large, massive. 
8. Above pale yellowish-gray, varied with black; below white, more 
or less tinged with fulyousss422 2 ee—eeee oe eee callotis. 
8a. Pale yellowish-gray above, varied with black; below white, 
tingéd! with fulvous._.) 72.2 ee ee var. callotis. 
8. More suffused with pale rufous throughout, with rather longer 
Caso. 25. ee eee var. ¢exensis. 
B. Lower jaw disproportionably small, relatively smaller than that of any 
other American species of Lepus. 
9. Somewhat smaller than cadlotis, and more rufous above. .californicus. 
