1902.] NATURAL SCIENCES OF PHILADELPHIA. 169 



and the internal cusp parah}^oconoid in relation. Lower molai'S 

 each with five cusps, the W-shaped disposition not being so strongly 

 marked as in the upper molars, the metahypoconoid and protopara- 

 conoid cusps more elevated than the remaining connecting ridges. 



3feasurements. — Average of three dried skins : Length of head 

 and body, 71mm. (67.5-74.7); forearm, 53.2 (52.7-54); tibia„ 

 21.1 (21-21.5); foot, 9.6 (9.5-10). 



Remarks. — This species can be readily distinguished from hlain- 

 villii by the characters given above. From m. intermedia it is 

 separated by the freer and less-crowded first upper premolar. The 

 subspecies senieida is distinguished by the form of the second upper 

 premolar. 



Specimens Examined. — Three skins with skidls : 



Merida, Yucatan (two) (U. S. N". M.). 



San Juan Bautista, Tabasco, Mexico (one) (U. S. N, M. ). 



Mormoops megalophylla senioula n. subsp. 



1870. Mormoops (Blainville ?) Duges (not of Leach), La Naturaleza, 



I, p. 137. (Guanajuato.) 

 1879. Mormops megalophylla Alston, Biol. Cent.-Amer., Mamm., p. 



37. (Part.) (Mirador ) 

 1900. Mormoops megalophylla Mearns (not of Peters), Proc. Biol. Soc. 



Wash., XIII, p. 166. (Fort Clark, Texas.) 



Type. — Adult ? ; Fort Clark, Kinney coimty, Texas. No. 

 84,801 U. S. National Museum. December 3, 1897. Collected 

 by Dr. E. A. Mearns. 



Distribution. — Southern Texas (type locality only known record), 

 northern and central Mexico, probably intergradiug with the typical 

 form to the south of the central plateau country. 



General Characters. — This form differs from the typical form of 

 megalophylla in the much heavier and broader second upper pre- 

 molar, which bears a very heaA'y and wide internal shoulder. The 

 forearm seems to average slightly longer, but this was rather unsat- 

 isfactorily determined as all the available specimens of the typical 

 form a.'-e skins. 



Teeth. — Essentially as iu megalophylla except for the form of 

 the second upper premolar. This tooth is broader than the length 

 of the labial border, the internal portion of the tooth is much more 

 extensive, a broad rounded shallow shoulder being formed, which 

 development is comparatively slight in megalophylla. 



Color. — Upper parts broccoli-brown, the whole with a faint 



