428 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



lar, which is very small in comparison with the anterior portion. 

 (Major '99, pi. 36, fig. 33; pi. 37. fig. 23.) 



Upper Extremity. — The radius and ulna are subequal in size, 

 apparently shorter than they are in most of the Leporid?e. (Major 

 '99, p. 490, figs. XXXVI-XL.) 



Species in the genus. — One. Caprolagits hispid us (Pearson). 



Caprolagus is apparently a well-marked genus of the Leporid?e. 

 It was the first member of the family to be separated as a genus dis- 

 tinct from Lepus. The structure of its teeth associate it with Lepus, 

 Sylz'ilagus, and Oryetolagus, while the general shape of the skull 

 make it appear related to Xesolagus and Peutakigus, as do also the 

 external characters. 



Genus PENTALAGUS new 



1900. Caprolagus Stone, Proc. Acad. Nat. Sci. Philadelphia, p. 460. 



Type. — Pentalagus furnessi (Stone). 



Geographieal Distribution. — Liu Kiu islands. 



Diagnosis. — Ears and hind feet unusually short, similar to pro- 

 portions in Ronierohigus, pelage harsh, throat patch not well marked. 

 Skull and teeth of leporine build, but molars f instead of |. 



Skull (pi. Lxxix, 2a, 2b, 2c). — The skull as a whole is low and 

 flat, not so much arched as is usual among the Leporidje, broad be- 

 tween the orbits, rostrum shorter and heavier than in the other 

 Leporidae. Nasals very short and broad, as wide in front as behind ; 

 their most posterior point is on a line just anterior to the antero- 

 inferior angle of the zygoma ; in most of the other genera of the 

 Leporidae, the nasals are on a line just posterior to the antero- 

 inferior angle of the zygoma. 



The postorbital process consists of the posterior limb only, as is 

 the case with Pronolagus, Caprolagus, and Ronierolagus. It is well 

 developed, heavier and more blunt than in the genera just mentioned. 



The sutures of the interparietal are obliterated. 



The bony palate is long, being four times the length of m^ ; its 

 posterior fourth is formed by the horizontal plates of the palate bones. 



The incisive foramina are narrow, their sides approximately 

 parallel, resembling in shape those of Pronolagus, but very much 

 smaller. Their greatest width taken together is about half the length 

 of the bony palate and much less than the width of the choan?e. The 

 choange are wide, but their width is less than the length of the bony 

 palate. The pharyngeal vault is low. The posterior palatine 

 foramina are well developed and are situated at the outer anterior 

 angles of the horizontal plates of the palate bones. 



