lvon] the hares axd their allies 411 



rounded off. The antero-ventral angle is produced into a blunt, very 

 short spine. The horizontal rami of the pubic bones slope back- 

 ward more than in the other genera with the exception of Roiucro- 

 lagiis. 



The femur and the fibula of Limnolagus are typical for the family 

 Leporidse, as detailed in the general account (page 382). The tibia 

 (pi. xcix, 10) of Limnolagus however is relatively heavier than in 

 the other genera excepting Roincrolagits. It resembles that of the 

 latter genus in ihe fact that it is rather curved, the inner surface of 

 the lower part of the shaft being concave. 



The foot (pi. c, 5) is about equal in length to the tibia. As in the 

 other genera, the basal width of the metatarsals is contained about 

 two and a half times in the length of the third metatarsal. The 

 combined lengths of the phalanges of each toe is about equal to 

 the length of the metatarsal of that toe. 



Species in the genus Limnolagus, see page 337. 



Limnolagus is a well-marked genus. It has a number of char- 

 acters associating it with Syk'ilagus on the one hand and with 

 Romcrolagus on the other. The radius, the ulna, the hind foot, the 

 pelvis, and the scapula are much alike in Limnolagus and Sylz'ilagus. 

 Occasionally abnormal individuals show postorbital processes some- 

 what alike in the two genera. 



The palatal region of Limnolagus shows some resemblance to the 

 same region in Romcrolagus, while the whole sternum and the shape 

 of the transverse processes on the lumbar vertebrae and the degree 

 of development of the tail are intermediate in character between 

 these structures in Romcrolagus and Sylz'ilagus. 



Genus BRACHYLAGUS Miller 



1900. Brachylagus Miller, Proc. Biol. Soc. Washington, xiii, p. 157, 

 June 13, 1900. 



Type. — Brachylagus idahocnsis (Merriam). 



Geographical Distribution. — Upper Sonoran faunal area, in south- 

 'crn Idaho, in northern Nevada and California, and in eastern Oregon 

 and Washington. 



Diagnosis. — Externally similar to Lepus, except that the tail is 

 unusally short. Skull essentially like that of Lcpus but with inter- 

 parietal distinct ; audital bullfe relatively larger than in any of the 

 related genera. First upper premolar with only one reentrant angle 

 on anterior face. Reentrant angles of upper molariform teeth ex- 

 tending only half-way across the tooth and not crenate. 



Skull (pi. Lxxviii, 3; Lxxix, I ). — Brachylagus is the smallest of 



