1902.] NATURAL SCIENCES OF PHILADELPHIA. 389 



TWENTY NEW AMERICAN BATS. 

 BY GERRIT S. MILLER, JR. 



This paper, published here by permission of the Secretary of the 

 Smithsoniau Institution, contains descriptions of twenty new 

 American bats, the types of nineteen of which are in the United 

 States National Museum. Six of these belong to the series of 

 Mexican bats in the Biological Survey collection, kindly placed at 

 my disposal, together with those in his private collection, by Dr. C. 

 Hart Merriam. 



Antrozous minor sp. nov. 



Tijpe.— Adnli (skin and skull), No. 79,096, United States 

 National Museum (Biological Survey collection). Collected at 

 Comondu, Lower California, Mexico, September 20, 1895, by J. 

 E. McLellan. 



Characters. — Color as in the large Antrozous paeificus or slightly 

 darker; size rather less than that of the small A. palMus. 



Color. — Dorsal surface buff, everywhere washed with wood- 

 brown, but particularly on region behind shoulders. Under parts 

 clear buff, paler than that of back and fading to cream-buff on 

 middle of belly. Ears and membranes dark brown. 



Skull and Teef/i.— Skull narrower than that of the other species, 

 the difference particularly noticeable in the posterior region of the 

 braincase. Crown of upper premolar and of first and second upper 

 molars much shorter in proportion to their width than in A. palli- 

 dum and A. paeificus. The lower molars are uniformly smaller than 

 those of A. pallidus, but not different in form. 



Measurements. — External measurements of type: Total length, 

 93; tail, 35; tibia, 20; foot, 10 (9); forearm, 48; thumb, 9.6; 

 second digit, 40; third digit, 80; fourth digit, 68; fifth digit, 63; 

 ear from meatus, 23; ear from crown, 19; width of ear, 16; 

 tragus, 11.4. 



Cranial measurements of an adult male from tlie type locality 



