LEPORID^ 171 



A KEY TO BRITISH LEPORINE. 



I. EXTERNAL CHARACTERS:— 



I. Ear when bent forwards reaches far beyond) T rnr7C 



tip of nose ..... .J r 



II. Ear when bent forwards reaches about to tip of nose : — 



1. Hind foot about equal in length to) ORYCTOLAGUS cuni- 



tail, including hairs . . .j cuius. 



2. Hind foot much longer than tail, 



including hairs (in young speci- 

 mens double) — 



A. General colour ochraceous or) r rnrTp 7 ., 



u- j r x. ,. /- „ YEEPOb nibermcus. 



tawny; hind foot to 165 mm. J 



B. General colour deep brown or] 



smoky (in winter whitish) ; \-L. timidus scoticus. 

 hind foot to 155 mm. . .J 



II. TEETH AND SKULLS:— 



I. Course of root of upper incisor not visible) 



externally ; length of bony palate greater I OR YCTOLA G US cuni- 

 than width of posterior nares, which are j cuius. 



narrow . 



II. Course of root of upper incisor visible 

 externally ; length of bony palate less 

 than width of posterior nares, which are 

 very wide ...... 



1. Root of upper incisor not reaching 



premaxillo-maxillary suture ; dis 

 tance between anterior edge of 

 zygoma and anterior termination 

 of external groove greater than 

 least depth of arch 



2. Root of upper incisor passing pre- 



maxillo - maxillary suture ; dis- 

 tance between anterior edge of 

 zygoma and anterior termination 

 of external groove less than least 

 depth of arch — 



A. Skull larger — occipito - nasal) T 

 length to 95 (or more) mm. ./ 



LEPUS. 



LEPUS europceus. 



hibemicus. 



B. Skull smaller — occipito-nasal) T . ■ ■ 7 



, „„,.i ¥n r \L,. timidus scohcus. 



length to 90 mm. . .J 



