ALLEN: MAMMALS OF THE WEST INDIES. 223 



(Bull. Amer. Mus. Nat. Hist., L899, 12, p. 178) has characterized the 

 former as P. trinitatis, a smaller animal than P. canina, with a forearm 

 averaging 40 mm. (39-41) instead of 45, as in P. canina. Robinson 

 and Lyon give forearm measurements of P. canina from La Guaira, 

 Venezuela, ranging from 41 to 45 mm.; average of eleven specimens, 

 42. These Venezuela specimens are therefore rather smaller than 

 typical specimens from eastern Brazil, the forearm of which is given 

 by Gervais as 45 mm. The sixteen adults obtained by us in Grenada 

 show extremes of 41-44.5 mm. in forearm measurements, with an 

 average of 42.5. They are therefore to be distinguished from those 

 of northern South America by the color alone, a character which is, 

 however, rather striking. From the Peropteryx of Trinidad they are 

 differentiated by the forearm measurement, but the color of this 

 species is unknown except from alcoholic specimens. Although the 

 Grenada Peropteryx differs but slightly from its nearest representa- 

 tives to the south, it seems nevertheless advisable to emphasize these 

 differences by giving a subspecific name, since a somewhat similar 

 trend of variation is found in the races of Artibcus planirostris inhabit- 

 ing the same areas. 



An interesting point, apparently not yet recorded for the continental 

 Peropteryx, is the occurrence of a dark color phase in the Grenada 

 race. Thus among the adults taken, are a few colored entirely of a 

 sooty brown, somewhat darker than Ridgway's clove-brown. 



We found these bats in but one spot, a rather open cave on the sea- 

 cliffs at Point Saline, the extreme southern end of the island. They 

 clung by both hind feet to the rough surfaces of the rock, usually in 

 well-shaded, overhanging places; but, on being disturbed, would flit 

 farther into the darker recesses of the cave. Others, however, flew 

 about under a tree near the mouth of the cave, but eventually took 

 shelter in adjoining fissures. Their characteristic sprawling position 

 when they first alight, with forearms spread out holding the body 

 against the wall, is noted by Robinson and Lyon. When alarmed, 

 they make a sharp, twittering noise, not very loud. 



NOCTILIONIDAE. 



Noctilio leporinus (Linne). 



Vespcrtilio leporinus Linne, Syst. Nat., ed. 10, 1758, 1, p. 32. 

 Vespertilio mastivus Dahl, Skrift. Naturhist. Selsk. Kjobenhavn, 

 1797, 4, pt. 1, p. 132, pi. 7. 



