1904.] NATUKAL SCIENCES OF PHILADELPHIA. 429 



be made. It is without doubt a member of the present Phyllosto- 

 matinos, but that it is not worthy of separation from some of the types 

 of this division is not so certain. The genus Lonchorhina does not 

 appear to the author to be as close an ally as Dobson's work would 

 lead one to suppose; and taking the allied genera broadly, Macrotus 

 appears to be a very distinct type, not differentiated as strongly by 

 skull characters as by some external developments. 



Key to the Forms. 



a. — General size medium or large; skull 'with the interorbital region 

 sUghtly and roundly depressed. 

 b. — Ear medium or large (averaging 26 to 28 millimeters in length) ; 

 skull with the rostrum rather heavy; interorbital region 

 broad, 

 c. — Foot quite robust, toes strong; West Indian forms. 

 d. — General color ochraceous brown or pale umber. 



e. — First lower prem.olar subquadrate in basal out- 

 line; anterior width of the rostrum equal to 

 the interorbital space. 

 /. — Upper tooth-row heavy and strongly crowd- 

 ed; skull large, 26.8 inm. in length, 



waterhousii Gray. 

 ff. — ^Upper tooth-row narrow and not strongly 

 crowded; skull medium, not more than 

 24.5 mm. in length, 



w. jamaicensis n. subsp. 

 ee. — First lower premolar elongate-elliptical in basal 

 outline; anterior width of the rostrum less 

 than the interorbital width, 



w. compressus n. subsp. 

 dd. — General color dark umber or dark reddish-brown, 



w. minor (Gundlach). 



_cc. — Foot rather slender, toes weak; Mexican and Central 



American forms. 



d, — Skull large (averaging 24.8 mm. in length); second 



upper premolar heavy, . mexicanus Saussure. 



d,d. — Skull medium (averaging 23 mm. in length) ; second 



upper premolar rather weak and short, 



m. hidleri (H. Allen). 



hb. — Ear exceptionally large (averaging over 30 mm. in length) ; 



skull quite slender with the rostrum and interorbital region 



narrow, calif ornicus Baird. 



aa. — General size quite small; skull with the interorbital region very 



broad and strongly depressed, pygmceus n. sp. 



Macrotus waterhousii Gray. 



1843. Macrotus Waterhousii Gray, Proc. Zool. Soc. London, 1843, p. 21. 



[Hayti.] 

 1855. M\acrotus'\ Waterhousii Gray, Suppl. Schreber's Saugthiere, V, p. 640. 



[Hayti and Jamaica.] (Part.) 



