ALLEN! MAMMALS OF THE WEST INDIES. 247 



Nyctinomus orthotis II. Allen, Proc. U. S. Nat. Mus., 1890, 12, 



p. (M.S. 



Nyctinomops orthotis Miller, Proc. Acad. Nat. Sci. Philadelphia, 

 1902, p. 393 (by lapsus). 



Promops orthotis Miller, Proc. Biol. Soc. Washington, 1902, 15, 

 I>. 250. 



Eumops orthotis Miller, Bull. 57, U. S. Nat. Mus., 1907, p. 258. 



This is the Jamaican representative of Eumops glaucinus of Central 

 America and Cuba, with which, indeed, it was considered by Dobson 

 identical. It is apparently a trifle smaller, but no careful comparison 

 of the two forms has yet been published. The above synonymy is 

 sufficient to show the vicissitudes of nomenclature through which 

 this species has passed to its final place in the genus Eumops. 



Molossus obscurus verrilli Allen. 



Molossus obscurus Auct. 



Molossus fuliginosus Gray, Mag. Zool. Bot., 1838, 2, p. 501, (not 

 of Cooper, 1837). 



Molossus fuliginosus Gray, Dobson, Cat. Chiropt. Brit. Mus., 1878, 

 p. 413. 



Mollossus [sic] verrilli Allen, Bull. Amer. Mus. Nat. Hist., 1908, 

 24, p. 581. 



Under the name Molossus obscurus are still currently confused at 

 least two species, whose ranges and habits appear to be much alike. 

 These are a smaller, glossy black animal, which, in a previous paper 

 (1908, p. 59) I have shown to be M. crassicaudatus, with forearm 

 measuring usually 36 or 37 mm.; second, a larger, browner bat, the 

 true M. obscurus, with forearm 40 to 43 mm. The extremes of these 

 two species may often approach each other very closely in many of 

 their external measurements; but the bulk of the larger bat is very 

 conspicuously, probably nearly a third, greater. The skulls are 

 markedly different in size, that of M. crassicaudatus measuring in 

 extreme median length 16 or 17 mm., that of M. obscurus from north- 

 eastern Brazil, 19 mm., with a more prominent, knife-like sagittal 

 crest. The color differences between the two species are not so readily 

 apparent in alcoholic specimens, a fact which has no doubt largely 

 aided in their confusion, although in M. obscurus the more extensive 

 pale bases to the hairs, especially of the shoulders and chest, will 

 usually aid in distinguishing it. A further point of difference between 



