1904.] NATURAL SCIENCES OF PHILADELPHIA. 203 



Remarks. — This species is unlikely to be confused with any form of 

 the genus except the race mexicana, which can readity be separated liy 

 the size and the intensity of the coloration in the brown phase. From 

 the boothi group it can readily be separated by the characters given 

 in the key of species. 



Specimens Examined. — Four, one skin and three alcoholic individ- 

 uals : 



Port of Spain, Trinidad. (U. S. N. M.) [2.] 



Costa Rica. (U. S. N. M.) [1.] 



Chontales, Nicaragua. (U. S. N. M.) [1.] 



Chilonycteris rubiginosa mexicana (Miller). 



1879. Chilonycteris rubiginosa Alston, Biol. Cent.-Amer., Mamm., p. 35. 



(Part.) [Mirador, Mexico; Duenas, Ciudad Vieja, Guatemala; Costa Rica; 



Colombia; Brazil.] 

 1894. Chilonycteris riibiginosus J. A. Allen. Bull. Amer. Mus. Nat. Hist., VI, 



p. 247. (Not of Wagner.) [South shore of Lake Chapala, Michoacan, 



Mexico.] 

 1902. Chilonycteris mexicana Miller, Proc. Acad. Nat. Sci. Phila., 1902, p. 



401. [San Bias, Tepic; Hacienda Magdalena, near city of Colima, Co- 



lima; Chacala, Durango; Ameca, Bolanos, Jalisco: near Ometepec, 



Guerrero; Morelos; Huil tepee, Oaxaca; Mexico.] 



Type Locality. — San Bias, Tepic, Mexico. 



Distribution. — Specimens have been examined from localities reach- 

 ing from Tehuantepec and Huiltepec, Oaxaca to Chacala, Durango, 

 while individuals from Mirador, A^era Cruz, are perfectly typical. To 

 the south, no doubt, this form grades into true rubiginosa, as the speci- 

 mens from southern Mexico average larger than those from around the 

 type locality. 



Miller says of this form: ''At San Bias Chilonycteris mexicana was 

 very common in a small narrow cave which extended like a deep 

 crevice into the base of the cliff on the hillside facing the town." 



General Characters. — Similar to C. rubiginosa. but smaller, and the 

 brown phase of coloration lighter. 



Limbs. — As in rubiginosa, but for the smaller size. 



Membranes and Fur. — As in rubiginosa. 



Color. — Bro-wn phase : above prout's-brown , rather pale on the nape; 

 below with the hair seal-brown basally with broccoli-brown tips, the 

 color weak on the throat due to the thinner character of the pelage. 

 Ears and membranes clove-brown. 



Rufous phase: entire body and head rich tawny-ochraceous, the 

 hairs of the under surface brown at base (varying from cinnamon on 

 the throat to mummy-brown on the abdomen). Ears and membranes 

 clove-brown. 



