OCT., 1916. MAMMALS, COLLINS-DAY EXPEDITION OSGOOD. 211 



the predominant one, and in general the effect on the under parts is 

 grizzled. The variation in the width of the buffy annulations on the 

 hairs of the upper parts is correlated with the general extent of buffiness; 

 and while some specimens have distinct, buffy eye rings and postauric- 

 ular spots, others have these markings whitish rather than buffy or so 

 reduced as to be scarcely apparent. The series includes several im- 

 mature examples not more than half-grown, and these are colored 

 practically as in the adults. It thus appears that there are two styles 

 of coloration one in which the under parts are grayish or whitish and 

 the other in which they are buffy. Comparing extremes of the two 

 styles, one might easily entertain the idea of their specific distinctness. 



Examination of the skulls, of which about half are unbroken, shows 

 the usual slight variations in the size and shape of nasal and interparietal 

 bones, but the most striking irregularity is found in the size of the 

 audital bullas, the horizontal diameter of which ranges from twelve to 

 fourteen millimeters in specimens of the same sex and apparently the 

 same age. 



In separating Cavia boliviensis from C. musteloides * Thomas has 

 mentioned only characters which appear to be within the limits of 

 the variation in this Parotani series, and it is therefore possible that 

 C. boliviensis should be treated as a synonym of C. musteloides. How- 

 ever, in the absence of specimens from Sahama, which has been selected 

 as the type locality of musteloides, it does not seem quite safe to conclude 

 that no differentiation exists. But it is reasonably certain that boliviensis 

 is at most no more than a subspecies of musteloides. 



A note in Mr. Becker's field catalogue states that the cavies were 

 obtained on rocky hills surrounding the fertile irrigated valley in which 

 Parotani is situated. 



Viscaccia punensis Thomas. TITICACA VISCACHA. 



One skin without skull, Puno, Peru. Collected by G. K. Cherrie, 

 January 22nd. 



The pelage of this individual is in worn, ragged condition consisting 

 principally of the thick "wool hairs." The dorsal line is barely appar- 

 ent, and there are no white axillary spots. As compared with specimens 

 of V. inca and V. subrosea it is darker, more brownish, throughout. 

 Flesh measurements are as follows: Total length 320; tail 280; hind 

 foot 90; ear 65. 



Ganis culpaeus andinus Thomas. BOLIVIAN WOLF. 



One specimen, Pampa de Arrieros, Peru. Altitude 13,500 feet. 

 * Ann. & Mag. Nat. Hist., (8), VIII, p. 254, 1911. 



