1890.] MR. O. THOMAS ON MAMMALS FROM VERA CRUZ. 75 



Apparently allied to L. sylvaticus, but markedly larger, with 

 longer ears, and much duller in general colour. 



Fur very soft, markedly softer tlian in the ordinary southern 

 forms of L. sylvaticus. General colour dirty yellowish or greyish, 

 without rufous, except on the nape, the light subterminal rings on 

 the hairs uniformly pale cream-colour. Face grizzled greyish 

 yellow, the light area round the eye well-marked, pale cream-colour. 

 Ears about as long as the head, their backs thinly haired, grey, the 

 extreme tips and outer edges darkening to black, but not more promi- 

 nently so than in L. sylvaticus. Inner surfaces dull yellow, this colour 

 not visible along the edges of the ear. Nape dull pale rufous. 

 Underfur of back slaty basally, dull brown terminally ; longer hairs 

 black, with a cream-coloured subterminal ring. Sides gradually 

 becoming yellowish towards the belly; under surface dirty yellowish 

 grey, the line of demarcation not marked at all. The belly-hairs 

 themselves are pale slaty basally, and dull yellowish terminally, 

 while there are scarcely any white-tipped hairs present. On the chin, 

 however, the hairs are white-tipped. Fore limbs dull orange-yellow, 

 their posterior sides scarcely lighter ; fore feet about as hairy as in 

 ordinary Mexican L. sylvaticus. Hind limbs dull orange-grey 

 externally, gradually becoming more fulvous to the heels ; their 

 inner edges, the pale line along the groin in front of the hip, and 

 the upper surfaces of the hind feet dull yellow, not white. Tail 

 rather short, greyish brown above, the hairs both here and on the 

 rump in front of it slaty basally, and yellowish brown terminally ; 

 under surface pure white. 



Skull readily distinguishable from that of L. sylvaticus by its 

 greater size. Postorbital processes pressed against the sides of the 

 brain-case at their tips posteriorly, but free at their bases. Inter- 

 parietal triangular, its antero-posterior nearly two thirds its trans- 

 verse diameter. Occipital shelf unusually broad. Anterior edge of 

 palatal bridge level with the front of the anterior premolar, and its 

 hinder edge level with the division between the last premolar and 

 the first molar. 



Measurements (approximate — from a dried skin) : — Head and 

 body 460 millim. ; tail, without hairs 32, with hairs 43 ; hind foot, 

 without claws 94, with claws 104 ; ears, above crown, 90. 



Skull — Greatest length (occiput to gnathion) 85, basal length 69*5, 

 greatest breadth 39 ; nasals, length 36, breadth, anteriorly 10, pos- 

 teriorly 15 ; interorbital breadth, including supraorbital ridges, 19 '4, 

 intertemporal breadth, internal to processes, 13 ; interparietal, length 

 5"3, breadth 8'7 ; occipital shelf, breadth 11*6; diastema 23*4; 

 palatine foramina, length 20*4 ; least breadth of palatal bridge 92; 

 length of upper tooth-series, crowns only, 14; basi-cranial axis 22; 

 basi-facial axis 52. Lower jaw — length, bone only, 65, to incisor- 

 tips 68 ; height from condyle to antero-inferior corner of angular 

 ridge 43 ; length of the ridge 31. 



It is with much hesitation that I presume to add to the long list 

 of described American Leporidse, but L. verce-crucis seems so 

 distinct from any known form that there appears to be no alternative. 



