DESCRIPTION OF A NEW SPECIES OF BAT 
FROM THE WESTERN UNITED STATES 
( Vesfertilio ciliolabrum sp. nov.) 
13y 13k. C. HART MERRIAM. 
[ From the Procceedings of the Biological Society of Washington, Vol. IV., 1886-'87.] 
Separates issued December 17, 1886. 
GIBSON BROS.PRS.WASH From the Proceedings of the Biological Society of Washington, Vol. IV, 1886-7. 
Extras printed December 17, 1886. 
DESCRIPTION OF A NEW SPECIES OF BAT 
FROM THE WESTERN UNITED STATES. 
( Vesper tilio ciliolabrum sp. nov.) 
By Dr. C. Hart Merriam. 
(Read November 27, 1886.) 
Specimens of a small and apparently hitherto undescribed 
species of bat have reached me from two widely separated 
localities in the Western United States. The first were col- 
lected by Mr. A. B. Baker in Trego County, Kansas; the 
second by Mr. A. W. Anthony in Grant County, in the ex- 
treme southwestern corner of New Mexico. 
Mr. Baker writes me that "the first two of these bats were 
found in bluffs or canons near the town of Banner, and were 
hidden away in clefts in the chalk rock. The others were 
captured at a bluff' several miles distant. They had secreted 
themselves in abandoned swallows' nests which were inacces- 
sible ; but the bats were easily dislodged by means of stones. 
They were followed to their various places of refuge, and seven 
were secured." 
These bats belong to the group of American Vespertilios, of 
which K nitidus may be considered fairly typical. They differ 
from V. nitidus, however, in size, proportions, and color, as 
well as in the much larger size of the ear. 
The Kansas specimens vary in color from nearly pure white to 
pale yellowish-brown, or even isabella-brown, while those from 
New Mexico are tawny-isabella above and much paler under- 
neath. 2 
BIOLOGICAL SOCIETY OF WASHINGTON. 
The following characters will serve to distinguish the species 
from its allies : 
VESPERTILIO CILIOLABRUM* sp. nov. 
(Type No. 2797 female ad., Merriam Collection). 
7-1 / 7 /- 7 • 2"2, I-1, 3-3, 3-3, 18 o 
Dental formula : 1. , c. pm. -~ -- - 28. 
6 1-1 3-3 3-3 20 
The outer upper incisor of each side slopes forward and 
inward parallel to the inner, contrary to the rule in the genus 
Vesper tilio^ in which these teeth usually are divergent; cusp 
of inner upper incisor bifid, the anterior point being larger. 
First upper premolar small and crowded against (and usually 
somewhat internal to) the canine; second upper premolar 
minute and wholly internal to the tooth-row so that it is not 
visible from the outside except in immature individuals ; third 
premolar very large, nearly or quite equal to canine. Middle 
lower premolar smallest; posterior largest. 
Sides of upper lip fimbriate. Glandular prominences be- 
tween eyes and nostrils moderately developed. Tip of ear 
laid forward extends to end of muzzle. 
The calcaneum reaches about half-way from the foot to the 
tip of the tail; the postcalcaneal lobule is large for a Ves- 
pertilio ; the calcaneum ends in a projecting tooth or lobule. 
The form of the ear is somewhat intermediate between that 
of V. nitidus and that of V. nigricans: Internal basal lobe 
slightly rounded; middle three-fourths of anterior margin 
strongly convex ; tip shortly rounded off, forming a small, pro- 
jecting lobe posteriorly, beneath which the outer border is 
sharply emarginated for about one-third of its entire length ; 
bottom of emargination straight or slightly convex ; below this 
*The specific name ciliolabrum refers to the fringe of hairs along the 
sides of the upper lip. DESCRIPTION OF A NEW BAT. 
3 
the outer margin becomes abruptly convex and then nearly 
straight, with a distinct reflexed lobe near its base. Tragus at- 
tenuated above ; inner margin straight or slightly convex ; outer 
margin slightly concave in upper half, then slightly convex, 
with a distinct lobule at the base, which is separated by a 
notch from the convexity above. 
Thumb very small, considerably shorter than the foot. Foot 
small. Wings from base of toes. Upper surface of wing- 
membranes haired from about the middle of the humerus to 
the knee : basal third of upper surface of interfemoral mem- 
brane covered with hair ; on under surface of interfemoral the 
hair is arranged in little tufts along transverse lines, about 
thirteen in number. Half of last vertebra of tail free. 
Fur long and soft; basal portion dusky; apical portion vary- 
ing from whitish or yellowish-white to isabella-brown (tawny- 
isabella in the New Mexico specimens), which, in some indi- 
viduals is nearly as dark^s in K. subulatus ; the colored apical 
portion varies in extent from less than one-third to more than 
one-half the length of the hairs. 
Measurements from alcoholic specimens.-Male adult (No. 
2794 Merriam Collection) : Head and body, 42 mm. ; head, 
16.25 mm. ; tail, 37 mm. ; ear, from inner basal angle, 15 
mm. ; tragus, 6.75 mm. ; humerus, 22 mm. ; forearm, 32.50 
mm. ; thumb, 3.75 mm. ; third finger, 56 mm. ; fifth finger, 
44 mm.; tibia, 11.25 mm-5 hind foot, 7 mm. 
Female adult (type, No. 2797 Merriam Collection) : Head 
and body, 43 mm. ; head, 16.25 mm. ; tail, 40 mm. ; ear, 
from inner basal angle, 15 mm. ; tragus, 6.75 mm. ; humerus, 
22 mm. ; forearm, 33 mm. ; thumb, 3.50 mm. ; third finger, 
56 mm.; fifth finger, 45.50 mm.; tibia, 11.50 mm.; hind 
foot, 7.50 mm. 4 
BIOLOGICAL SOCIETY OF WASHINGTON. 
2792 
2793 
2794 
2795 
2796 
2797 
2798 
2786 
2787 
No., Mus. C. H. M. 
p a> 
s 
rr 0 
- ? 2 = = = = = ? 
2 * 
g § 
Locality. 
Ovj 40 40 40 40 40 Oj Qj 
S3 
S F 
Sex. 
42. 
42. 
42. 
43-5° 
43-50 
43- 
42. 
4i- 
Head and body. 
l35. 
39- 
37- 
40. 
42. 
40. 
39- 
38. 
4i- 
Tail. 
16.50 
16. 
16.25 
16.50 
16.50 
16.25 
16. 
16. 
i5- 
Head. 
i5- 
i5- 
i5- 
*5- 
15-50 
i5- 
*5- 
14.50 
14.50 
Ear from internal 
basal angle. 
OS Os Os Os OS Os Os Os 0 
o, 0 <t <t 6 <r -r 
O cn 01 01 O cn cn 
Tragus from in- 
ner base. 
22.5033. 
2i.5032.50 
22. 32-50 
22.5033. 
22-5o 3? 
22. 33- 
21.5032. 
21- 33- 
20. 32. 
Humerus. 
Forearm. 
3-75 
3-5o 
3-75 
3-25 
3-5o 
3-5° 
3-25 
3-5o 
3- 
Thumb. 
Os Oi +■' 'os -G 'os Os 
'o 0 
3d finger. 
44. 
41-50 
44- 
44-50 
44-50 
45-50 
42. 
43-50 
42. 
5th finger. 
11-50 
11-25 
11-25 
11.50 
11.50 
11.50 
11.50 
11.50 
11. 
Tibia. 
■L 
oS-9 
1 
05-9 
o£-X 
•4 
Sr-4 
•4 
•9 
•4 
Hind foot. 
A. B. Baker 
4I 
4 4 
4 ( 
4 C 
C C 
4 4 
A. W. Anthony 
44 
Collector. 
August, 1885 
4 4 4 4 
4 4 4 4 
4 4 4 4 
4 4 4 4 
4 4 4 4 
4 4 4 4 
Aug. 25, 1886 
April 6, " 
Date. 
Measurements of nine alcoholic specimens of Vespertilio ciliolabrum. 
(AU measurements are in millimetres).