322 On a new Ciicetulusyy-o/n Mongolia, 



XXXVIII. — A new Cricetulus from Mongolia. 

 By Oldfield Thomas. 



Among a small collection of rodents from N.E. Siberia 

 presented to the National ^Iiiseum by Mr. C. W. Campbell 

 there are two specimens of a Cricetulus which appears to be 

 undescribed. It may be called 



Cricetulus CamphelU, sp. n. 



Closely allied to C. songarus, Pall., which alone of described 

 species has completely hairy palms and soles. Colour and 

 markings apparently much as in that species, tlie charac- 

 teristic lio-ht patches on slioulders, sides, and hips contrasting 

 prominently with the body-colour, but the dark slioulder- 

 stiipe of C. songarus is less developed and the dorsal line is 

 narrower and more sharply defined. Back greyish buffy ; a 

 prominent black dorsal line commencing faintly on the crown, 

 becoming shar[)ly defined on the nape, and running to the base 

 of the tail. Lateral patches creamy buff, the grey areas divid- 

 ing them but slightly darkened. Belly-hairs slaty basally, 

 " cream-buff terminally. Ears small, much smaller than in 

 the true C songarus ', their colour as described in C. dichrootis, 

 Satunin *, the black of the front half of the outer surface 

 contrasting markedly with the white of the hinder edge of the 

 inner. Upper surface of hands and feet silvery white. 

 Palms densely hairy, but the tips of the digits, the usual three 

 small pads at the base of the fingers, the very large hallucal 

 and small median carpal pads naked. Similarly, behind, the 

 soles are densely hairy, the tips of the digits and three small 

 distal pads alone naked. Tail very short, about half the 

 length of the hind foot, club-shaped, silvery whitish. 



Skull short, the brain-case proportionally large and rounded. 

 Palatal foramina parallel-sided. Bullaj very small. 



Dimensions of the type (measured as a spirit-specimen) : — 



Head and body 87 mm. ; tail 7 ; hind foot 12 ; ear 11. 



Skull : greatest length 24 ; basilar length 19 ; zygomatic 

 breadth 13'7 ; length of nasals 9 ; interorbital breadth 3*7; 

 breadth of brain-case 11"4 ; palate length 98 ; diastema 6*4:; 

 palatal foramina 4*1 X 1"6 ; length of upper molar series 3'5. 



llab. Shaborte, N.E. Mongolia (about 40° 40' N., 114° E.). 

 A second specimen from Tatir Suma. 



Tgpe. Male (skinned out of spirit). B.M. no. 5. 2. 1. 3. 



* Ann. Mus, Pt^tersb. vii. p. 567 (1902). 



