JAN., 1912. MAMMALS, VENEZUELA AND COLOMBIA — OsGoop. 63 
rufous to chestnut without trace of middorsal streak and in the other 
dull clay color with an indistinct light median streak. 
Dizemus 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 bulle 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,t 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 
SO hlahidecaeictenteingl, Dagieulies tea alepbiiinis i Mid bieitlensble diftecence tn cise between 
examples of typical D. rotundus from Paraguay and from Mexico and Central America. 
In rotundus, the forearm measures 60-64 mm. in Mexican and Guatemalan specimens the 
me is 55. A corresponding diference is shown by the skulls. et tn ae 
fore, to recognize a northern subspecies, agner’s name murinus Schreb. Saugeth 
P. 377, Masay weuich: would otunil as Deawiodns teanieies aamtnee Woaner. 
t Proc. Zool. Soc. Lond., pp. 205-310, 1908. 
