1904.] NATURAL SCIENCES OP PHILADELPHIA. 255 



Dermonotus davyi fulvus (Thomas). 



1872. Pteronotus Davyi Peters, Monatsber. K. Preuss. Akad. Wissensch., 



Berlin, p. 361. [Brazil; Mexico.] (Part.) 

 1879. Chilonycteris davyi Alston, Biol. Cent.-Amer., Mamm., p. 36. [Mexico; 



Venezuela; Trinidad; Brazil.] (Part.) | 



1890. Pteronotus davyi J. A. Allen, Bull. Amer. Mus. Nat. Hist., Ill, p. 178. 



[Plains of Colima, Mexico.] 

 1892. Ch[ilonycteris] Davyi fulvus Thomas, Ann. and Mag. Xat. Hist., 



6th ser., X, p. 410. [Las Penas, Jalisco, Mexico.] 

 1894. Pteronotus davyi J. A. Allen, Bull. Amer. Mus. Nat. Hist., VI, p. 248. 



[South shore of Lake Chapala, Michoacan, Mexico.] (Not of Gray.) 

 1902. D[ermonotus] fulvus Miller, Proc. Biol. Soc. Washington, X^', p. 155. 



Type Locality. — Las Penas, Jalisco, Mexico. 



Distribution. — Specimens have been examined or recorded from 

 localities from Tehuantepec to the type locality in JaHsco on the west 

 coast, and from Apazote, Campeche, to Mirador, 'S^era Cruz, on the 

 Atlantic side. 



General Characters. — Similar to D. fulvus, but the size is less and the 

 first upper premolar is more crowded and with the greatest length 

 transverse. 



Head, membranes and other external characters as in Dermonotus 

 davyi. 



Skull and Teeth. — Essentially as in D. davyi, except for the smaller 

 size and the crowded character of the first upper premolar. This tooth 

 is strongly crowded between the canine and second premolar, and in 

 consequence is twisted so that the greatest length is almost transverse. 



Color. — Brown phase: Fur above vandyke-brown ; below ecru-drab, 

 the hair seal-brown basally. Membranes and ears clove-brown. 

 Rufous phase: Fur above rich tawny, below golden ochraceous, hair 

 cinnamon basally. Membranes and fur as in the rufous phase. From 

 the series examined it would appear that the individuals are equally 

 divided between the two phases. 



Measurements. — ^Average of series : Total length [20]* 63.3 (59.7-73.5) 

 mm.; head and body [21] 47.2 (41.5-60.5); head [20] 17.1 (16-18.5); 

 ear [20] 14.9 (12.5-16); tragus [20] 4.7 (4.2-5); forearm [30] 44.1 

 (42.5-46) ; thumb [30] 7.3 (7-9) ; third digit [20] 74.7 (71-78) ; tibia 

 [30] 17.1 (16-19); calcaneum [18] 20 (18-23); foot [30] 9.9 (8.5-10.8); 

 tail [23] 20.5 (18-24.3). 



Average of series of skulls: Total length [10] 15.5 (15-16); greatest 

 zygomatic width [9] 8.7 (8.2-9.3) ; interorbital width [10] 3.6 (3.5-3.9) ; 

 height at base of second premolar [11] 3.4 (3-3.9) ; height of brain-case 

 [8] 6.3 (6-6.8); width of palatal constriction [9] 1.3 (1.2-1.5); length 

 of palate from anterior foramina [9] 6.2 (6-6.5) ; width of palate in- 



* Number of individuals in brackets. 



