1902.] NATURAL SCIENCES OF PHILADELPHIA. 399 



External Form. — Except for its greater size, Ncdalus major so 

 olosely resembles speeimeus of N. dramineits from Domiuica as to 

 require no detailed descriptiou. 



Skull and Teeth. — While the skull resembles that of X. stramin- 

 eus iu form it is readily distinguished by its larger size aud heavier 

 structure. The braiucase iu particular is greatly inflated as com- 

 ]iai-ed -with that of the smaller species. Rostrum -with sides nearly 

 pai'aliel. The teeth are similar iu form to those of X. stramineus. 



Measurements. — External measurements of the type and of an 

 adult female from the type locality: Total length, d 110, ? 116; 

 head and body, c? 49, ? 53; tail, d 61, ? 63; tibia, d 22.4, 

 9 23; foot, d^ 9 (7.6), ?9.8 (8); forearm, c? 42, ? 43; thumb, 

 c? 6, ? 6 ; second digit, d 44, 9 43 ; third digit, c? 80, ? 82 ; 

 fourth digit, d 61, ? 62 ; fifth digit, d" 57, 9 58 ; ear from 

 meatus, d 15, 9 16.6; ear from crown, d 12, 9 12. 



Cranial measurements of type: Greatest length, l.S (17),''' basal 

 length, 16.4 (15.6); basilar length, 14.6 (14); median palatal 

 length, 9.8 (8.8) ; breadth of rostrum at base of canines, 4.4 

 (3.6); iuterorbital constriction, 3.6 (3.2); zygomatic breadth, 

 9.6 (9); greatest breadth of braincase, 9 (7.8); mandible, 14 

 (13); maxillary toothrow (exclusive of incisors), 8 (7.8); man- 

 dibular toothrow (exclasive of incisors), 8.4 (7 8). 



Specimens Examined.— Two, both from the type locality. 



Remarks. — Xatalus major has been compared with eighteen spe- 

 cimens of X. stramineus from the island of Dominica. None of 

 the latter at all closely approaches it iu size. 

 Natalus mexicanus sp. nov. 



Type.— Adult female (iu alcohol). No. 96,496, United States 

 National Museum (Biological Survey collection). Collected at 

 Santa Anita, Lower California, ^Mexico, in July or August, 1897, 

 by J. F. Abbott. 



C'Aarac^ers.- Smaller than N'atalus stramineus; skull with ros- 

 trum more tapering anteriorly. 



'\ Color. — In color as in other external characters Xatalit.-^ me.ci- 

 camis apparently does not differ from X stramineus. The only 

 specimens of the latter that I have seen are, however, preserved 

 in alcohol. Two well-defined color phases occur, a yellow and u 



"Measurements in j)arenthescs are tliose of an adult male X. stramiu- 

 euH from the islantl of Doaiinica (No. 113,005). 



