ANTHONY — NEW RODENTS AND BATS 
85 
Color. — Above, everywhere uniform Mars brown of Ridgway, the hairs mi- 
nutely tipped with whitish and with the extreme bases lighter, on the neck and 
behind the ears the white at the base of the hairs is much more extensive and 
produces a lightening in the external color; below the hairs are snuff brown except 
for an irregular median area of cream buff and an extensive area on the throat 
and chest which is cream buff; membranes naked, brownish black, with only a 
very slight whitening at the tip of the middle finger. 
Ears. — Very large and broad, with numerous transverse, arcuate plications; 
tragus broad, with thickened anterior border and with single notch on anterior 
border and one tooth on posterior border, lacking the serrations seen in auritus. 
Skull. — Similar in all details to that of auritus. 
Measurements (from dried skin). — Total length, approximately, 115 mm.; tail 
vertebrae, 40; hind foot, with claws, 16.3; forearm, estimated from two fragments, 
84; height of ear from base of tragus, 28.2; height of tragus, 8.5; greatest breadth 
of tragus, 4.3. 
Skull. — Breadth of braincase, 10.6; least interorbital breadth, 4.2; zygomatic 
breadth, 13.2; breadth of palate across m^, 9.0; length of upper toothrow, c-m®^ 
9.4; length of mandible, 16.6; length of lower toothrow, c-ma, 10.7. 
Colomhianus is readily distinguishable from auritus not only by the 
marked difference in color but by the much wider, thicker tragus, 
which lacks the serrated margins seen in Peters’s figures® and also 
noticeable in a specimen of auritus from Bonda, Colombia. The lack 
of white on the wing tips serves to separate it from auritus guiance,^ 
while auritus australis described in the same paper as the foregoing 
species, evidently has the same color pattern as auritus since Thomas 
makes no mention of any color difference and bases the separation of 
the new subspecies upon the amount of white on the wing tip. 
In the color pattern of the under parts, the throat and abdomen 
being lighter than the adjacent regions, is seen a possible approach 
toward the white throated species, C. carrikeri. Carrikeri, however, 
differs conspicuously from colomhianus in color and also in details of 
ear structure, having a smaller ear and more slender tragus. 
Histiotus inambarus sp. nov. 
Type, No. 37194, Dept, of Mammalogy, 9 , Peru, Rio Inambari (70° 15' W., 13° 
55' S.), altitude 2200 feet, March 12, 1915; collectors, Messrs. H. and C. Watkins. 
The type is a skin in fair condition with a slightly crushed skull. 
General characters. — Similar in size and general characters to Histiotus macrotus 
but coloration paler, ears narrower and less convex along inner margin. 
Color. — Above uniform Saccardo’s umber, the hairs noticeably darker at the 
® Abhandl. k. preuss. Akad. Wissensch. Berlin, 1865, p. 305. 
^ Ann. and Mag. Nat. Hist. (7), XVI, p. 308, 1905. 
JOURNAL OF MAMMALOGY, VOL. I, NO. 2 
