358 University of California Publications in Zoology [Vou.17 
Description: Head—Inner edge of ear evenly convex when flat- 
tened out; forward interior margin reflexed over a deep depression 
at upper extremity of keel, forming a sort of pocket; outer margin 
bilobate ; the lower lobe arising from a short straight base coming up 
from antitragus, upper lobe continuous with tip and inner edge; keel 
large, strongly reflexed at angle near base, and extending slightly 
exterior to antitragus. Tragus straight on inner and upper margins; 
outer margin formed by two shghtly concave lnes producing by their 
juncture a slight lobe at center of this margin. Conch with seven 
diagonally transverse flutings, appearing as furrows on upper surface, 
and as ridges on lower surface, the posterior one being but very 
-shehtly indicated. On outer surface of conch, and passing through 
centers of these flutings at right angles to them, is a slight ridge 
formed by a doubling of the skin. The peculiar depressed angle 
formed by the juncture of the two lobes of the external margin of 
the conch gives the ears of this species a peculiar drooping appearance 
that suggested the specific name depressus. Nostrils circular, open- 
ing forwards, outwards, and very slightly downwards. A prominent 
subcireular swelling between eye and nostril and slightly below the 
line connecting them. Side of face with five flutings extending to 
lip, and a deep furrow under eye. Face and chin nearly naked. 
Limbs and Membranes—On upper surface of antebrachial mem- 
brane, a line of very short hairs, so fine as scarcely to be perceptible 
when wet, borders humerus and radius. On upper surface of the 
wing membrane, short lines of hairs border the radius, except at the 
extreme elbow, and occupy the angle formed by juncture of fourth 
and fifth metacarpals. Both upper and lower surfaces of wing mem- 
brane covered with hairs to a line extending from proximal third of 
humerus to middle of femur. Interfemoral membrane covered for 
three or four millimeters below the femora on upper surface, but 
naked on lower. <A well-developed ecallosity at base of first phalanx 
of thumb. 
Color—Above, burnt umber; below, Prout’s brown; bases of hairs 
on both surfaces white. Membranes and ears (in aleohole specimen) 
nearly concolor with under surface of body. Wing membranes, from 
inner surface of distal end of tibia and from ealear, indefinitely 
edged with yellowish white, this color better defined in centers of 
interdigital spaces and in center of space between fifth finger and 
tibia. Outer edges of first and fifth toes closely fringed with short 
curved white hairs; on fifth toe, dorsal to this outer fringe, is a row 
of less numerous curved hairs, exceeding others about three times 
in length. From upper surface of base of each claw spring three or 
four long curved hairs, about 8 millimeters in length of chord. 
= ps 9-9 a 
Teeth —Dental formula: = = ge join ===. eee 
Day leah 2-2 3-3 
incisors semi-conical, parallel, and separated by a space of 1 milli- 
meter. Lower incisors bifid, crowded; the middle pair in a straight 
line; the outer ones start from near centers of inner surfaces of middle 
pair and diverge at an angle of 45 degrees from them. Canines long, 
with distinct, unbroken cingula, somewhat dilated on posterior in- 
ternal part of lower one, but not forming a true cusp. Upper canines 
—30)) Upper 
