24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 42. 



K ' ~ ~~ ~ ~ 



about 25 mm.) ; skull large and robust (not narrowed and Chceronycteris- 

 like, as in the equally large L. hesperia G. M. Allen*), its size and 

 general appearance much like that of Leptonijderis nivalis; teeth 

 pecuHar in the unusual development of inner lobe of ^^m* and the 

 subquadrate outline of crown in m^ and m^. 



External characters. — Essentially like L. mordax, apart from the 

 larger size, but foot not so long relatively to tibia, and interfemoral 

 membrane apparently wider. 



Color. — Upper parts between mars-brown and raw-umber, the 

 hairs becoming much paler (approaching ecru-drab) at base; under- 

 parts light isabella-color tinged with raw-umber, not contrasted 

 noticeably \\\i\\ back. 



SlcuU and teeth. — Apart from its large size and robust general form 

 the skull does not differ essentially from that of Lonchopliylla mx)rdax. 

 Rostrum less elongate in proportion to its depth; mesopterygoid 

 space relatively shorter and mder; basisphenoid pits with anterior 

 border less sharply defined. 



Incisors and camnes as in L. mordax, except that the cutting edge 

 of lower incisors is less distinctly trilobate. Premolars like those of 

 the smaller animal, but small basal cusps tending to be better devel- 

 oped, and inner root of pin^ situated decidedly behind middle of 

 tooth. Upper molars much less reduced than in L. mordax, the length 

 of the inner portion of tooth so great as to give the crown a decidedly 

 squarish outline, especially in m^ and m^; outer portion of tooth, 

 representing the styles and commissures, unusually well developed, 

 the margin of the ridge standing more nearly at level of points of 

 main cusps than in the related species. Lower molars with relatively 

 wider crowns and liigher cusps than in L. mordax, but details of their 

 structure showing no special peculiarities. 



Measurements. — Type and adult female: Head and body, 56 and 

 60 mm.; tail, 6t and 10; mdth of interfemoral membrane at middle, 

 15 and 15; tibia, 17.6 and 17; foot, 10.4 and 10.4; forearm, 43.6 and 

 43; thumb, 11 and 12; third fmger, 88 and 86; fifth finger, 59 and 56; 

 ear from meatus, 16 and 14; condylobasal length of skull, 25.2 and 

 25.4; breadth of rostrum over roots of canines, 4.2 and 4.2; interor- 

 bital constriction, 5.2 and 5.4; breadth of brain case, 10.2 and 10; 

 mastoid breadth, 11.2 and 11; depth of brain case at middle, 7.4 

 and 7.2; mandible, 18.4 and 18.8; maxillary tooth row, exclusive of 

 incisors, 9.8 and 10; mandibular tooth row, exclusive of incisors, 10.2 

 and 10. 



Specimens examined. —Four, all from the ChiUbrillo cave. 



* Through the kindness of Mr. Samuel Henshaw and Dr. Glover M. Allen I have been enabled to examine 

 the type of this species. The animal is so different from the other known forms of Lonchophylla that it 

 can hardly be regarded as a member of the same genus. 



t Apparently injured at tip. 



