182 BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



Ty'pe specvmen. — Adult female (skin and skull), No. 77670 United 

 States National Museum (Biological Survey collection). Collected 

 at Huehuefean, Chiapas, Mexico, March 1, 1896, by E. W. Nelson and 

 E. A. Goldman. Original number 9455. 



Distribution. — Tropical zone in southern Mexico (Chiapas, 

 Campeche and Yucatan). 



Diagnosis. — Size constantly below the maximum for the species; 

 greatest length of skull usually less than 13.5 mm. and never attain- 

 ing as much as 14 mm. (known maximum 13.4 mm.) ; foot usually 

 more than half as long as tibia (average ratio of foot to tibia in 10 

 examples about 53.5). 



Measurements. — For measurements see tables, pages 185 and 188. 



Sfecvtnens examined. — Forty-one, from the following localities : 



CAMPECHE: La Tuxpana, 1 skin (U.S.N.M.). 

 CHIAPAS: Huehuetan, 10 skins, 26 ale. (U.S.N.M.). 



YUCATAN: Izamal, 2 skins (U.S.N.M.), 1 skin (A. M. N. H.) ; no exact 

 locality, 1 skin (B. M.). 



Remarks. — Superficially this small race of Myotis nigricans re- 

 sembles the Mexican form of M. calif omicus in dark immature pelage. 

 Specimens may be recognized, however, by the slight extent of the 

 dark under color on the back, the relatively large foot (more than 

 half as long as tibia), and the small teeth. 



MYOTIS NIGRICANS NESOPOLUS MUler 



Myotis nesopolus Miller, Proc. Biol. Soc. Washington, vol. 13, p. 123, April 6, 

 1900. — TBotJESSABT, Catal. Mamm. viv. foss., suppl., p. 93, 1904. — Lyon and 

 Osgood, List Type-Sp. Mamm. U. S. Nat. Mus., Bull. U. S. Nat. Mus., No. 

 62, p. 272, January 28, 1909. 



Myotis nespotus J. A. Allen, Bull. Amer. Mus. Nat. Hist., vol. 33, p. 384, July 9, 

 1914 (misprint). 



Type locality. — Near Willemstad, Curasao, Dutch West Indies. 



Type specimen. — Adult male in alcohol. No. 101849, United States 

 National Museum, collected near Willemstad, island of Curac:ao, 

 Dutch West Indies, November 4, 1899, by L. B. Smith. 



Diagnosis. — Similar to Myotis nigricans extremus^ color appar- 

 ently less dark and foot apparently shorter, the ratio of its length to 

 that of tibia about as in true M. nigHcans. 



Description. — Color above between raw umber and Front's brown, 

 the bases of the hairs just perceptibly darker. Below, ochraceous 

 buff, the basal half of the hairs slaty black. 



Measurements. — For measurements see tables, pages 186 and 188. 



Specimens exannined. — Total number 2, as follows: 



CURACAO, D. W. I: Willemstad, 2 ale, including type (U.S.N.M.). 



Remarks. — Myotis nigricans nesopolus is so similar to the small 

 race occurring in southern Mexico that we are unable to give wholly 



