166 PROCEEDINGS OF THE ACADEMY OF [March, 



the hair of the upper sux'face basally the same tint as the lower 

 surface. Ears and membranes blackish-bi'own. 



The ;Mona Island si^ecimens are all imiformly colored, but a San 

 Domingo specimen (No. i^SI Field Columb. Mus.) is ochraceous 

 above, slightly darker toward the lips of the hair, the tint of the 

 lower surface being tawny ochraceous ; two Cuban specimens exam- 

 ined are identical with true blainvillii iu coloration. From the 

 evidence available it is seen that this form presents two color 

 phases, one brownish, the other ochraceous. 



Measiirements. — Average of ten specimens : Length of head and 

 body, 51.2 mm,; head, 16.8; ear, 15.1; tragus, 4.4; forearm, 

 44.5; thumb, 6.6; third finger, 83.1; tibia, 19.5; calcaneum, 

 19.4; foot, 8.5; tail, 25.8. 



Remarks. — The difference iu the form of the first upper premolar 

 exhibited by this form is quite striking, and is constant in the series 

 of specimens examined. No diffei'ence can be detected between the 

 specimens from Mona Island and those from San Domingo. While 

 no inlergradation is known to occur with M. blainvillii, in view of 

 the slight differentiation I prefer to call this form a race and not a 

 species. 



Specimens Examined. — Twelve — three skins, nine alcoholics : 



Baracoa, Cuba. Two alcoholics (Coll. U. S. Nat. Mus.). 



Mona Island, Porto Rico. Seven specimens — two skins (with 

 skulls), five alcoholics (Coll. U. S. Nat. Mus.). 



San Domingo. Two alcoholics (Coll. Acad. Nat, Sci. Phila. ). 



Aquacate, San Domingo. One skin mih skull (Coll. Field 

 Columb. Mus.). 



Mormoops megalophylla (Peters). 



1856. JI[o7'mops'i blainvillii Peters (not of Leacli), Monatsber. k. 



preuss. Akad. Wissenscli., Berlin, p. 411. ("Cuba.") 

 1856. Mormoops Blainvillii Peters (not of Leach), Abliaudl. k. 



preuss. Akad. Wissensch., Berlin, p. 289, taf. 1, figs, 1-5. 



("Cuba.") 

 i860. Mormops Blainvillii Saussure (not of Leach), Revue et Mag- 



asin de Zoologie, 2e ser,. XII, p. 290, PI. XV, lig. 5.^* (Mexico.) 

 1864. Mormops mcgalojyhylla Peters, Monatsb. k. preuss. Akad. 



Wissensch., Berhu, p. 381. (Mexico.) 

 1873. Mormops merjalophylla Peters, Ibid., p. 359. (Mexico and 



Venezuela.) 

 1878. Mormops megalopJcylla Dobson, Catal. Chiropt. Brit. Mus , p. 



455. (Dueiias, Guatemala, Colombia and South America.) 



" There is no way of telling to which form of the species this reference 

 properly pertains. 



