MAMMALS OF VENEZUELA— ROBINSON AND LYON. 
157 
have a g-eneral color of burnt umber or chestnut, and three are dark 
tawny, niottlod with deep browni. 
All wore obtained from the natives. On the 6th of July there were 
brought in 26 alive in a sack, and on the following da}^ 39 more. 
Later, still others were l)rought in. The adult females were all nurs- 
ing, although the majority of the young w^ere able to fly. These bats 
are veiy rat-like in their actions, running about on a horizontal surface 
W'ith ease and rapidity. Some that were liberated made no attempt to 
rise from the floor, but scurried first to an open window and did not 
spread their wings until the}^ had launched themselves into the air. 
They were all captured in unused houses, where the}" stow themselves 
in the cracks, between the roof and the walls. When poked out they 
dropped to the floor and crawled about, and did not fly away like other 
bats, though perfectly able to do so. 
The}^ possess a peculiar gland in the throat, lying in front of the 
larynx. It is rudimentary in the female, but in the male it is about 
the size and shape of a white bean. It lies transversely under the 
skin and exudes a whitish, creamy fluid, which has a faint, but char- 
acteristic disagreeable odor. This persists in the dried skins, so that 
the sexes can be separated by the sense of smell. 
Bats of this genus could be seen fl.ying rapidly about early in the 
morning just before sunrise and in the evening just after sundown. 
Their flight is very rapid, and their pointed tails readily distinguish 
them from other bats. 
Measnremeritfi. 
No. 
Se.x. 
Length. 
Tail. Forearm. 
Longest 
finger. 
Tibia. 
Foot. 
102737 
102738 
102741 
1^)2742 
102745 
102746 
102747 
102748 
- 102749 
102750 
102751 
102752 
102753 
102754 
102765 
102766 
102767 
102768 
WR 1475 
Female . . . 
Male 
do.... 
Young 
male... 
Female . . . 
do.... 
do.... 
do.... 
Male 
do.... 
Female . . . 
Male 
do.... 
Female . . . 
do.... 
do.... 
Male 
do.... 
do . 
118 
127 
129 
123 
114 
118 
115 
120 
128 
131 
108 
118 
120 
117 
124 
122 
123 
130 
121 
40 
40 
47 
42 
43 
34 
34 
35 
36 
36 
39 
42 
33 
35 
38 
42 
43 
43 
44 
46 
48 
46.4 
45 
45 
46 
45.4 
45 
46 
48 
45 
47 
46 
46 
46 
47 
46 
46 
86 
91 
93 
83 
87 
91 
87 
95 
91 
88 
88 
91 
87 
89 
89 
92 
90 
15 
16 
19 
16 
17 
17 
16 
18 
18 
17.4 
18 
17. 4 
17 
17.4 
16 
17 
18 
18 
13 
12 
14.4 
13 
12 
12 
11.4 
12 
13 
li 
13 
13 
13 
12 1 
12 
12 
12 
WR 1477 i Female... 
WR 1478 \ do.... 
WR 1479 1 Male 
WR 1480 Female... 
WR 1482 : do .... 
WR 1483 , do .... 
WR 1488 Male 
WR 1489 Female . . 
WR 1490 do 
121 ' 44 
125 1 45 
128 
45 
127 
130 
124 
126 
119 
44 
45 
44 
44 
46 
89 ! 17 
12 
] 
40 
1 1 
121 
39 
1 
1 1 
