590 VESPERTILIO. 
Genl. Char. Size small, colors dark, muzzle broad. 
Color. Similar to V. f. miradorensis (H. Allen), dark brown. 
Peters describes the type as rust red, probably changed by alcohol. 
Measurements. Total length, 96-105: tail vertebre, 37-45; fore- 
arm, 40; thumb, 5-9.5; longest finger, 68; tibia, 17-18; foot, 7.8—10; 
tragus, 6—7.8. 
558. gaumeri (Adelonycteris), Allen, Bull. Am. Mus. Nat. Hist., 
LOO7, Ds 23k 
YucAaTAN Brown Bat. 
Type locality. Izamal, Yucatan, Mexico. 
Geogr. Distr. Yucatan, Mexico. 
Genl. Char. Similar to but smaller than V. juscus; narrower and 
more tapering tragus, and smaller in size; ears thin. 
Color. Above dark brown washed with olive; beneath buffy 
gray; ears and membranes black. 
Measurements. Total length, 95; forearm, 39; thumb, 7; third 
finger, 79; tibia, 70; tail, 40; foot, 8; ear, 21. Skull; greatest length, 
18; mastoid breadth, 8.3; zygomatic breadth, 10.1; interorbital 
breadth, 4; length of tooth row, 4.2; palatal length, 5.3. 
A. Marsipolaemus, 
Characters as given below for the species. 
559. *albigularis (Vesperus), Peters, Monatsb. K. Preuss, Akad. 
Wiss. Berlin, 1872, p. 260. 
WHITE-THROATED BRowN Bat. 
Type locality. Mexico? 
Geogr. Distr. Unknown. 
Genl. Char. Lower half of outer margin of the ear conch broadly 
folded backward, separated in front from the angle of the mouth 
by a wart, but terminating below and internal to it under the lower jaw 
by a small internal projection. Ears very broad and broadly rounded 
off above; tragus broad above, attaining its greatest width above the 
middle of the inner margin, which is slightly concave, narrowest 
opposite the base of the inner margin; a prominent triangular lobe at 
the base of the outer margin. Nostrils rather wide apart, opening 
sublaterally; muzzle broad and obtuse; crown of the head scarcely 
elevated above the face line. Wings from the base of the toes; 
postcalcaneal lobe long and narrow; last caudal vertebra free. Upper 
inner incisors long and broad and slightly bifid at their extremities; 
outer incisor very short, scarcely exceeding the cingulum of the 
*Possibly not Mexican. 
