30 PROCEEDINGS OF THE ACADEMY OF [1890. 



back in NoctiUo, are met with. In Chilonyderis davyi the back of 

 the trunk is naked as in Cephalotes and Notopteris. 



In Vesperugo lasiopterus the disposition for hair to grow along 

 the lines of the raised folds of the wing membranes is evident. 

 The basal clump of hair which is so commonly present in Vesper- 

 tilionidte aj^pears to correspond to those caudal vertebrre which are 

 in axial line with the trunk. 



In the Pteropodidfe the arrangement of the verrucjie is not of the 

 importance assumed in other families. Thus in the last named, the 

 rictal wart may separate the facial from the inter-ramal regions. 

 The same structure apparently determines the direction of the au- 

 ricular expanse forward. The mental warts in like manner forecast 

 the positions of mental leaflets in Noctilio, Chilonyderis and 3for- 

 mops. The region of the warts at the side of the muzzle becomes the 

 site of remarkable outgrowths in Synotus and Corynorhimts. In 

 Molossus rufus a group of hair-bearing verructe limits the area of dis- 

 tribution of the hair on the dorsum of the interfemoral membrane. 

 Special patches of hair are met with on the same surface in the fe- 

 male of Miniopteris schreibersii.^ 



For the opportunity of examining the material upon which the 

 study of the Pteropodidse is based I am indebted, in great part, to the 

 courtesy of Mr. F. A. Ward of Ward's Natural History Establish- 

 ment, Rochester, N. Y. 



*Proc. Acad. Nat. Sci., 1889, p. S22. 



