1890.] NATURAL SCIENCES OF PHILADELPHIA, 29 



anus is continuous with the line last named but is of a more rusty 

 tinge. 



The hair of the back is longei" than that of the front. There is no 

 mantle. The hair is slightly woolly over sacrum and on the thighs. 



The fur is everywhere unicolored. 



The second male like the foregoing, but the sides of the neck with 

 long coarse radiating rusty red hair. This color dominates the front 

 of the neck. The same colored but softer hair marks the position of 

 the mamma. 



The infra-anal region was gray. 



The single example of a female was the same as the above, excepting 

 that the rusty hue of the mamma dominates the color of the side 

 of the trunk and the rusty hue of the side of the neck extends less 

 evidently on the front. 



The differentiation of the region of the mamma is noteworthy in 

 this species. The hair on the side of the neck, according to Dobson, 

 is more rusty in the males during the rutting season than at other 

 times. The region also may be of secondary sexual significance. It 

 will be noted that the color in the single female scarcely differs from 

 that of the male. To a less degree than in any form examined were 

 the regions of the head and face distinguished. 



The distribution of the hair in families other than the Ptero- 

 podidae is not subject to the same sharp contrasts of color, nor to the 

 same variety within specific limits. The subject, however, is 

 worthy of extended study. As a rule the disposition to the sides 

 of the neck and body being more heavily furred than elsewhere is 

 evident. 



In Chalinolohus (as remarked by Dobson^) the fur of the head 

 and shoulders is darker than the rest of the body. Atalapha 

 cinerea exhibits the same disposition for the hair in front of the ear and 

 of the inter-ramal space to be darker than the adjacent regions as is 

 noted in some species of Pteropus. In the young of Atalapha nove- 

 boracensis while the head and back including the corresponding as- 

 pect of the interfemoral membrane is uniformly clothed, the under 

 surfaces of the head, neck, trunk and interfemoral membrane are 

 naked. In Artibeus and Carollia an attempt at special disposi- 

 tions of hair about the eye is clearly discernible. As is well known 

 a white dorsal stripe on the head and back of Artibeus and on the 



1 Catalogue of Cheiroptera in the British Museum. 



