1902. J NATURAL SCIENCES OF PHILADELPHIA. 39o 



( Thomas), but to u much less degree. ludeecl, it is probable that 

 it iutergrades with the Texau animal. The three specimens col- 

 lected at Kissimmee by Dr. Mearus, taken in connection with those 

 Avhicli I examined in 1897, show such constant difftirences from 

 D. intennedms that it now seems best to recognize the Austro- 

 riparian race by name. More detailed measurements of the two 

 forms will be found in North American Fauna, No. 13, p. 117. 



NYCTINOMOPS gen. nov. {Molossidx.) 



Ttjpe. — Nydinomus femorosaccus Merriam. 



Characters. — Externally like Nyctinomus. Skull similar to that 

 of Promops, except that the premaxillaries are separated in front 

 by a very narrow space. Teeth as in Nyctinomus, but upper 

 incisors parallel, the two occasionally in contact Avith each other. 



Eemarks. — Although intermediate between Nyctinomus and 

 Promops, the group of species of which N. femorosaccus is typical 

 forms a very natural genus. Its members have usually been 

 referred to Nyctinomus, but Dr. J. A. Allen* has recently placed 

 two forms (depressus and affinis) in Promops. In those thus far 

 known there are only four lower incisors. I have examined the 

 following species: Nyctinomops femorosaccus (Merriam), N. yucu- 

 tanicus sp. nov., N. aurispinosus (Peale), N. laticaudatus (E. 

 Geoffroy), N. orthotis (H. Allen), N. depressus (Ward), N. 

 affinis (J. A. Allen) and N. macrotis (Gray). It is probable that 

 Nyctinomus megalotis Dobson is also a member of this genus. 

 Nyctinomops yucatanicus sp. nov. 



%;e.— Adult female (skin and skull), No. 10?<,160, United 

 States National Museum (Biological Survey collection). Collected 

 at Chicken Itza, Yucatan, February 9, 1901, by E. W. Nelson 

 and E. A. Goldman. Original number, 14,521. 



Characters — Size and general appearance as in N. europs, but car 

 larger and with better developed keel, nearly as in N. femorosaccus. 

 Skull slightly larger than that of N. europs, the rostrum longer 

 and interorbital region more nearly cylindrical. Teeth as in 

 N. europs, but larger. 



Ears. — The ear agrees in all details of form with that of Nycti- 

 nomops femorosaccus, due allowance being made for its smaller size. 

 The keel, however, may be a little less developed, though its 

 *B>.dl. Amcr. M'is. Kat. Hist., XIII, p. 91, May 12, 1900. 



