I36 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 5° 



terminal expansion and subterminal contraction, better shown in 

 figure 5, plate xv, than described. The enamel pattern of the teeth 

 does not differ from that of M. fontanicrii, illustrated by Milne 

 Edwards. 



Measurements. — Field measurements taken in flesh by the col- 

 lector : Total length, 260 mm. ; tail, 55 ; hind foot, 36. Cranial meas- 

 urements of the type : Greatest length, 47 mm. ; greatest width, 34 ; 

 basal length, 44.8; basilar length, 38; interorbital constriction, 6.4; 

 maxillary tooth-row (crowns), 10.3; mandibular tooth-row (crowns), 

 10.9. 



Specimens examined. — One adult, the type, and four half-grown 

 young, all from Taocheo. 



Remarks. — Although closely related to Myotalpa fontanicrii, M. 

 cansus, with its differently shaped nasal bones and claws, is a welt 

 marked form. The different tooth patterns for members of the genus 

 Myotalpa, as illustrated by Milne Edwards, seem to me to be of 

 more than specific value. It is probable that when the fauna of 

 Asia is better known Myotalpa will be found to contain two or more 

 groups of species that may be regarded as subgenera. 



OCHOTONA CANSUS, new species 



Type. — Adult male, skin and skull, Cat. No. 144,030, U. S. N. M. ; 

 collected at Taocheo, Kan-su, China, June 8, 1906, by W. W. Simp- 

 son. Original number, 13. 



Diagnostic characters. — Closely allied to Ochotona tibctana 

 (Milne Edwards), 1 but smaller and zygomatic width of skull con- 

 siderably narrower. 



Color. — General color of upperparts and sides wood-brown, irreg- 

 ularly lined or grizzled with blackish. Behind each ear and toward 

 the back is an ill-defined light spot. On the sides of neck the wood- 

 brown is tinged with cinnamon. Underparts grayish, like No. 9 

 gray, Ridgway, tinged along the median line and on throat with dull 

 ochraceous-buff. Upper surfaces of fore and hind feet dull cream 

 buff. Base of fur of upperparts slate black; of underparts, slate 

 color. Soles of fore and hind feet densely clothed with light, dirty- 

 brownish hairs. 



Skull and teeth. — (Plate xv, figs. 1-3). The skull and teeth 

 are in general similar to those of Ochotona tibctana, but evidently 



1 Nouvelles Archives du Museum, vn, Bull, p. 93, and Recherches Mammi- 

 feres, p. 314, pi. xlviii, and pi. xux, fig. 1. 



