THE FAMILIES AND GENERA OE BATS. 159 



iarities. Tail absent. Calear short but distinct. Interfemoral 

 membrane moderately wide. 



Species examined. — Mesophylla macconnelli Thomas. 



Remarks. — As pointed out by Mr. Thomas, this genus is interme- 

 diate between Vampyrops and Ectophylla. It seems much nearer 

 the latter, however, with which it forms a distinct group character- 

 ized by the basin-shaped m 2 and m ., and the almost exact approxi- 

 mation in form of m t and p/n 4 . This last character is foreshadowed 

 in Vampyressa and Vampyriscus. 



Genus ECTOPHYLLA H. Allen. 



1892. Ectophylla H. Allen, Proc. U. S. National Museum, XV, p. 441, Octo- 

 ber 26, 1892. 



1898. Ectophylla H. Allen, Trans. Aimer. Philos. Soc, u. s., XIX, p. 267, 

 pi. XVI. 



Type-species. — Ectophylla alba H. Allen. 



Geographic distribution. — Honduras and Nicaragua. 



Number of forms. — The type species. 



Characters. — In general not unlike Mesophylla, but lower molars 

 only 2-2, and basin-shaped crown of m 2 and m „ crossed by a dis- 

 tinct median longitudinal ridge. Upper incisors with terete-conical 

 crowns, the inner pair approximating basally. Canines, premolars 

 (except pm^, and lower incisors as in Mesophylla. First upper 

 molar differing from that of Mesophylla in presence of a distinct 

 though low protocone. Second lower molar basin-shaped, the bot- 

 tom of the concavity occupied by a conspicuous though simple lon- 

 gitudinal ridge. As in Mesophylla, the tooth has only one cusp, a 

 rather high paracone. Last lower premolar and first lower molar 

 approximately alike and closely resembling the corresponding teeth 

 in Mesophylla, except that each has a distinct though low postero- 

 external cusp. Second lower molar very conspicuously basin-shaped, 

 broadly oval, much wider than ramus of jaw, its edge with two small 

 but distinct cusps on anterior border and a low, indistinct postero- 

 external elevation. As in the corresponding upper tooth, the bot- 

 tom of the concavity is crossed by a distinct longitudinal ridge. 

 This ridge is noticeably bicuspidate, or perhaps might be better 

 described as formed by the coalescence of two cusps.® Otherwise 

 essentially like Mesophylla. 



Species examined. — Ectophylla alba H. Allen. 



Remarks. — This genus is not distantly related to Mesophylla. In 

 dental characters it is one of the most aberrant of the Stenoderminee, 

 though the skull is not specially modified, and externally it has the 

 appearance of a small, whitish Vampyrops. 



"The peculiar cuspidate character of this ridge is not well shown in Harri- 

 son Allen's figure of the dentition. (Trans, Amer. Philos, Soc, n. s., XIX, 

 pi. xvi, fig. 3.) 



