26^ Dll. KNUD ANBERSEN ON BATS. [Apr. 7, 



the identification is correct, it appears natural to suppose that 

 the Key West bat was A. j. parvijMS, and that, consequently, 

 the range of this form extends to the islets between Cuba and 

 Florida, perhaps to peninsular Florida, the flora and fauna of 

 the southern part of which has, as well known, a subtropical 

 • character; 



Sjpecimens examined. — 25 specimens (9 skins) and 12 skulls, 

 from the following localities : — 



British Museum : — Cuba (4). Skulls of 3 specimens. 



U.S. National Museum * :— W. Cuba : El Guama (3) ; San 

 Diego de los Baiios (5); Guanajay (6); Mariel (1). — E. Cuba: 

 Baracoa (2) ; El Cobre (4). — 9 skulls fi'om practically all the 

 localities enumerated. 



Range. — Cuba, perhaps extending to Florida. 



Rehn's A. 'parvipes, 1902. — Stated to difter from the Jamaican 

 A. jamaicensis " in the smaller foreai'm and tibia, and the narrower 

 and lighter built foot"; forearm on average " 53'7 mm." (in 

 jainaicensis " 58*3 mm. "), tibia " 20*8 mm." [jamaicensis 

 " 21*9 mm."), foot in the type " 14 mm." (in a jamaicensis 

 ''15 mm."). "The second upper pi-emolaa- is broader and with 

 a heavier internal shoulder, the teeth being actually broader 

 than [in] jamaicensis, thouajh the latter possesses a slightly larger 

 skull." 



As to the external charactei'S given by Rehn, it must be said, — 

 ■first, that there is no definite line of separation between the 

 Cuban A. j^^arvipes and the Jamaican^, j . jamaicensis : I have 

 seen examples of jamaicensis with the forearm only 57 mm. 

 long, and examples of parvipes with the forearm 60 mm. ; in 

 jafuaicensis the lower leg is occasionally only 22 mm., in parvipes 

 sometimes 23 mm. ; in some jamaicensis the foot measures only 

 15*2 mm. in length, in some parvipes as much as 16'8 mm. 

 Second, the average measurements calculated by Rehn from 

 six p>arvi2Jes and six jamaicensis give a somewhat exaggerated 

 idea of the difierence in size between the two races ; compare 

 the table of measurements, p. 284. Third, since especial stress 

 was laid by Rehn on the smaller foot in 2^'^''''^'^'^'^^ (^^^ ^^^ 

 paper), it may be well to emphasise that this is perhaps the 

 least conspicuous of the external differences ; the average differ- 

 ence in this respect between the two forms is so small (0-7 mm.), 

 and the actual measurements so frequently overlapping each 

 other, that it would only in a small minority of cases be pos- 

 sible to distinguish the two forms by the size of the foot ; the 

 smaller foot in parvipes is simply a consequence of the smaller 

 size of the animal ; a closer study of the table of measure- 

 ments (p. 284) will show that proportionately the foot of parvipes 

 is precisely of the same size as in jamaicensis. — The dental 

 difference mentioned by Rehn must either have been derived 

 from, an individual aberration in the specimen examined by him, 



* U.S. N. M. iios. 103621-22, 103627, 103631, 103610, 103643, 103670, 103692-95, 

 103725-26, 103733-34, 113758, 113761, 113823, 113834-36. 



