JAN., 1912. MAMMALS, VENEZUELA AND COLOMBIA OSGOOD. 63 



rufous to chestnut without trace of middorsal streak and in the other 

 dull clay color with an indistinct light median streak. 



Diremus youngi (Jentink). Blood-sucking Bat. 



One specimen (skin), El Panorama, Rio Aurare, Jan. 21. 



This rare bat, one of the few known specimens, was disabled by a 

 blow from a light club in the hands of our cook-boy who discovered it 

 hovering near his fire one evening after complete darkness had set in. 

 The color of the under parts in our specimen is much as in many examples 

 of Desmodus rotundus, the hairs cinnamon brown or lighter at the bases 

 and ecru drab at the tips. The upper parts are rather dark cinnamon 

 brown more glossy and uniform than in Desmodus;* between the shoul- 

 ders is a thinly haired patch in which the light bases of the hairs are 

 .evident. The white wing markings are very pronounced, as follows: 

 Antebrachial membrane sharply and narrowly white-bordered; mem- 

 brane between second and third fingers largely white, this extending 

 to the covering of the bones of the second finger; wing tips white to 

 middle of membrane between third and fourth fingers; lower edge of 

 wing white-bordered throughout. The skull differs from that of 

 Desmodus in several characters which have not been pointed out. The 

 braincase is much broader and more expanded laterally; the zygomata 

 are heavier and more angular anteriorly; the audital bullas are nearly 

 twice as large; and the palate is shorter, broader, and less excavated. 



A specimen of D. youngi from Parana, Brazil, loaned by the U. S. 

 National Museum, is markedly paler than ours, being uniform rather 

 glossy clay color; but considering the great color variation in bats and 

 since no dry specimens from Guiana are available, separation at this 

 time does not seem warranted. 



Artibeus jamaicensis palmarum Allen and Chapman. Palm Artibeus. 



One specimen (skin), Encontrados, Sept. 25, 1910; collected by H. F. 

 Raven. 



Andersen, in his careful monograph of Artibeus,^ has recognized a 

 subspecies under the name palmarum, on the basis of a very slight 

 average reduction in the size of the teeth. Therefore, it seems best at 



* In selecting specimens of Desmodus for comparison, I find a noticeable difference in size between 

 examples of typical D. rotundus from Paraguay and specimens from Mexico and Central America. 

 In typical rotundus, the forearm measures 60-64 nun., while in Mexican and Guatemalan specimens the 

 maximum is 55. A corresponding difference is shown by the skulls. It would seem advisable, there- 

 fore, to recognize a northern subspecies, using Wagner's name murinus (Suppl. Schreb. Saugeth., I, 

 P- 377, 1840) which would stand as Desmodus rotundus murinus Wagner. 



t Proc. Zool. Soc. Lond., pp. 205-319, 1908. 



