284 MONOOUAPnS of KOUTU AMEUICAN llODENTIA. 



li. niiul feet not longer tlinn tlie liend. Size small. Poslorbitul proceHPes 

 convergent, frequently (in old opeeiniens) in contact with the 

 sUiill postc •iorly, but only rnrely nnchylosed with it. I'clngo 

 never wliitc. 



4. Gray above, varied with black, and more or less tinged with liglit 



yellowish-brown ; under parts white sylvaticun. 



4a. Above yellowish-brown, with a tinge of reddish, var. sylvaticus. 

 Ah. Paler, rather smaller, with slightly larger ears, and rather stouter 



lower jaw , var. Nuttalli. 



Ac. Color nearly as in vor. sylvaticus; ears rather longer and more 



distinctly black-tipped var. Auduboni, 



Ad. Like var. Nuttalli, but paler, and with considerably longer 



cars var. arizonie. 



5. Smaller than sylvaticus, with the postorbital process scarcely touching 



the skull jwatcriorly. Colors generally more finely blended, and 



darker. Tail very short, almost rudimentary Trowbridgei. 



G. Above gray, varied with black and pale yellow. Size of Trow- 

 bridgei, with Ihe colors and sparsely-clolhed feet ui palustris. 

 Tail very short, yellowish-brown below brasiliensis. 



7. Size of sylcaticus, 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 ; 

 lengtli 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 fulvous callotli. 



' ' 8o. Pale yellowish-gray above, varied with black; below white, 



I ' tinged with fulvous var. callotis. 



' ' '■ ■ 86. More suffused with pale rufous throughout, with rather longer 



ears var. texensis. 



B. Lower jaw disproportionably small, relatively smaller Ihan that of any 



other Anierican species of Lepus. 



9. Somewhat smaller ihawcalbtis, and more rufous above. .cal{/brnicus. 



