1904.] NATURAL SCIENCES OF PHILADELPHIA. 439 



interorbital width 4.1 (3.9-4.5); height at base of second premolar 3.7 

 (3.5-3.9); height of brain-case 9 (8.1-9.5); breadth of brain-case at 

 roots of zygomata 9.2 (9-9.6) ; width of palatal constriction 2.2 (2-2.5) ; 

 length of palate 9.4 (9-9.8); width of palate (including teeth) 8 

 (7.9-8.2); greatest length of mandible 16.4 (16-17.6). 



Remarks. — The Macrotus mexicanus group is closely related to the 

 West Indian waterhousii group, from which, however, it can be dis- 

 tinguished by the characters mentioned above. The slenderer build, 

 larger ears and lighter skull will at once separate M. calif ornicus from 

 this form, while the race bulleri is a smaller type of the viexicanus 

 character quite easily recognized. 



Dobson's Macrotus bocourtianus is, no doubt, simply the extreme 

 development of this form, and his measurements are almost identical 

 with those of the type of mexicanus given by Saussure. Specimens 

 from Tehuantepec average larger than ]\Iorelos specimens, but some 

 specimens in the same series are smaller than Cuernavaca individuals, 

 and as no other characters appear to be at variance, they should be 

 considered extreme mexicanus. ]\Iany of Dobson's measurements of 

 bocourtianus are smaller than the average of four Cuernavaca specimens 

 examined, and in several cases are actually smaller than the same 

 measurements of Saussure's type. 



Specimens Examined. — Nineteen; eleven skins, eight alcoholic 

 specimens : 



Cohma, Cohma. Two. (Biol. Surv.) 



La Salada, Michoacan. Five. (Biol. Surv.) 



Cuernavaca, Morelos. Four. (Biol. Surv.) 



Reyes, Oaxaca. One. (Biol. Surv.) 



Tehuantepec, Oaxaca. Seven. (A, M. N. H. and Field Columbian 

 Mus.) 

 Macrotus mexicanus bulleri (H. Allen). 



18S9. Macrotus californicus J. A. Allen, Bull. Amer. Mus. Nat. Hist., II, 



p. 166. [Bolaiios, Jalisco, Mexico.] (Not of Baird.) 

 1890. Macrotus bulleri H. Allen, Proc. Amer. Philos. Soc, XXVIII, p. 73. 



[Bolaiios, Jalisco, Mexico.] 

 1894. Macrotus bulleri H. Allen, Monogr. Bats N. Aiiier., p. 41. [Bolaiios, 



Jalisco, Mexico.] 

 1898. Otopterus mexicanus Merriam, Proc. Biol. Soc. Wash., XII, p. 18. 



[Maria Madre, Tres Marias Islands.] (Not of Saussure.) 



1898. Otopterus bulleri Merriam, Proc. Biol. Soc. AVash., XII, p. 18. [Bo- 

 laiios, Jalisco, Mexico.] 



1899. Otopterus mexicanus Nelson, North American Fauna, No. 14. p. 18 

 [Maria Madre, Tres Marias Islands.] (Not of Saussure.) 



Type Locality. — Bolahos, Jalisco, Mexico. 



Distribution. — From Guadalajara north to Durango and southern 



Chihuahua, also including the Tres Marias Islands. 



