2 I 2 Bulletin American Museum of Natural History [Vol. XXII, 



summer pelage being much darker and redder, in strong contrast 

 with the winter pelage. 



The collector's measurements of the type, an adult male, are: 

 Total length, 216; head and body, 108; tail vertebrae, 108; hind foot 

 (without claws), 24; ear from notch, 13. Nine adult males: Total 

 length, 223 (203-235); head and body, 108 (101 .6-114) ; tail vertebrae, 

 114.8 (105-123); hind foot without claws, 24.6 (23.8-25.4); ear 

 from notch, 14 (12.7-15.9). Eight adult females: Total length, 

 211.3 (197-228); head and body, 103 (95-108) ; tail vertebrae, 109 

 (95-120); hind foot, 23.4 (22-25.4); ear from notch, 13.2 (11-14). 

 About 2 mm. should be added to the length of the foot for the ad- 

 ditional length of the claws. Measured dry, the hind foot, with claws 

 runs from 26 to 29 mm. 



Seven adult male skulls: Total length, 31 (29.5-32); greatest 

 (or zygomatic) breadth, 14.6 (14-15.2). Four adult female skulls: 

 Total length, 30.6 (30-31) ; greatest breadth, 13.8 (13.6-14.4). Five 

 adult topotype skulls of H. pictus, 3 males and 2 females: Total 

 length, 31. 2 (30.3-32.5); greatest breadth, 14.4 (14-14.8). In these 

 latter the largest and smallest skulls are both those of females. 



17. Lepus insolitus Allen. 



Thirty-six specimens (skins with skulls), and several additional 

 separate skulls: Escuinapa, 35 specimens, Dec. 27, 30, Jan. 4, 14, 30, 

 April 27, May 28, June 1-4, Oct. 10, 31 ; Arroyo de Taquaco (altitude 

 4000 feet), i specimen, May 10. 



Collector's measurements of Escuinapa specimens : 10 adult 

 males, total length, 479 (445-510) ; head and body, 443 (394-482); 

 tail vertebrae, 46 (3751); hind foot without claws, 87 (83-89); ear 

 from notch, 73.5 (69-79): 10 females, total length, 475 (451-497); 

 head and body, 429 (400-457); tail vertebrae, 47 (44-51); hind foot, 

 88.5 (82-92); ear from notch, 73.4 (70-77). 



The single specimen from Arroyo de Taquaco (at 4000 feet altitude) 

 is larger than any of the Escuinapa specimens, though nearly equalled 

 in size by some of them. It measures, total length, 534; head and 

 body, 483; hind foot, 89; ear, 73. Possibly further material would 

 show that the form inhabiting the western foothills of the Sierra 

 Madre is separable as a large race of L. insolitus. 



Skull, 8 adult males from Escuinapa: occipito-nasal length, 81.6 

 (79-84); greatest zygomatic breadth, 37.5 (37-38.5); interorbital 

 breadth, 19.4 (18-25); mastoid breadth, 31 .6 (29.5-32); length of 

 nasals, 36.6 (35-38): 6 females, occipito-nasal length, 81.3 (79-83); 



