LEPORID^ 171 



A KEY TO BRITISH LEPORIDtE. 



I. EXTERNAL CHARACTERS :— 



I. Ear when bent forwards reaches far beyond") r cz:>r7Q< 



.■ c \LhJr'ui> europcEUS. 



tip of nose J ^ 



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



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



tail, including hairs . . ./ cuius. 



2. Hind foot much longer than tail, 



including hairs (in young speci- 

 mens double) — 



^.General colour ochraceous or^^^^^^^.^^ 

 tawny ; hmd foot to 165 mm. J 



B. General colour deep brown or"! 



smoky (in winter whitish) ; VL. 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 \0R YCTOLAGUS cuni- 

 than width of posterior nares, which are j cuius. 

 narrow J • 



II. Course of root of upper incisor visible"| 



externally; length of bony palate lessl ^ c-p,^,-, 

 than width of posterior nares, which are j 

 very wide J 



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 j^_ ^^.3^^^^^^_ 



length to 95 (or more) mm. ,J 



B. Skull smaller -occipito-nasalj^^^.^^.^^^^^^^.^^^^ 



length to 90 mm. . .) 



LEPUS europceus. 



