AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 183 



satisfactory characters by which to distinguish it. We believe, how- 

 ever, that good material from Curagao will eventually establish the 

 distinctness of the two forms, and that in the present state of our 

 knowledge the course which we have adopted in describing the 

 Mexican animal as new is less unreasonable than it would be to 

 apply the name nesopolus to both of these small races of Myotis 

 lilgrica/ns, separated as they are geographically by Colombia, Pan- 

 ama, and Central America, an area inhabited by the large typical 

 form. 



MYOTIS NIGRICANS I>OMINICENSIS Miller 



Myotis dominicensis Miller. Proc. Biol. Soc. Washington, vol. 15, p. 243, Decem- 

 ber 16, 1902. — Miller and Rehn, Proc. Boston Soc. Nat. Hist., vol. 31, p. 

 121, August 27, 1903.— Elliot, Land and Sea Mamm. Middle Amer., Field 

 Columb. Mus., publ. 95, zool. ser., vol. 4, p. 576, 1904. — Trouessart, Catal, 

 Mamm. viv. foss., suppl., p. 95, 1904. — Elliot, Check List Mamm, North 

 Amer., Field Columb. Mus., publ. 105, zool. ser., vol. 6, p. 475, 1905. — Lyon 

 and Osgood, List Type-Sp. Mamm. U. S. Nat. Mus., Bull. U. S. Nat. Mus., 

 No. 62, p. 270, January 28, 1909.— Miller, List North Amer. Land Mamm. 

 1911, Bull. U. S. Nat. Mus., No. 79, p. 58, December 31. 1912; List North 

 Amer. Recent Mamm. 1923, Bull. U. S. Nat. Mus., No. 128, p. 72, April 29, 

 1924. 



Type locality. — Dominica, British West Indies. 



Type specimen. — Adult male, in alcohol. No. 113564 United States 

 National Museum, collected on the island of Dominica, British West 

 Indies, July 20, 1901, by H. Selwyn Branch. 



Distribution. — So far as known, this bat is found only on the is- 

 land of Dominica, Lesser Antilles. The form occurring on Grenada, 

 to the southward, is apparently true Myotis nigricans. Up to the 

 present time no representatives of the species have been recorded 

 from the intermediate islands, nor Has any member of the genus 

 Myotis been reported from any other part of the entire Antillean 

 chain. 



Diagnosis. — ^Like Myotis nigricans extremus but with smaller 

 skull. 



Description. — A topotype is cinnamon brown both above and 

 beneath, the membranes blackish brown. Another, probably in a 

 subadult pelage, is fuscous above; chin and belly cinnamon brown, 

 throat fuscous. 



Shall. — The skull attains the smallest size that is known in any 

 American Myotis (pi. 1, p. 7, fig. 5). In form it is peculiar in the 

 unusually reduced volume of the brain case. 



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



SpeciTfieTis examined. — Total number 36, from the following local- 

 ities : 



DOMINICA, B. W. I: 1 ?kin (B. M.), 1 skin (M. C. Z.) ; 29 ale, including 

 type (U.S.N.M.) ; Basin Well, 5 ale. (B. M.). 



