MYOTIS. PIPISTRELLUS. 581 
uropatagium, which is naked; upper incisors bilobate; nose sub- 
bilobate; face with a naked prominence on both sides; ears short, 
pointed; tragus sublinear, anterior border straight; tail projecting 
a little beyond membrane; wings attached at the base of toes. Skull: 
nasals and palate broad; forehead sloping; braincase broad poste- 
riorly, contracted anteriorly, outline slightly wedge shaped. 
Measurements. Total length, 83.5—89.5; tail vertebrae, 37.6—40; 
tibia, 15.5—16.1; foot, 7.3-9.1; forearm, 36.1-38.9; thumb, 5.6—6.7; 
longest finger, 60.2-63.7; ear from meatus, 12.2-13.7; width of ear, 
9.t-9.7; tragus, 7.1-8. Skull: occipito-nasal length, 13; total length, 
14; Hensel, 10; zygomatic width, 8; interorbital constriction, 3.2; 
palatal length, 6; length of upper molar series, 4; length of mandible, 
angle to symphysis, 10; length of lower molar series, 4. 
a.—longicrus True, Science, vill, 1886, p. 588. Elliot, Syn. N. 
Am. Mamm., 1go1, p. 402. 
albescens H. Allen, Mon. N. Am. Bats, 1893, p. 92. 
TRUE’sS Bart. 
Type locality. Puget Sound, Washington. 
Geogr. Distr. Puget Sound east to Wyoming, south to southern 
California and Arizona, into Lower California and northern Mexico. 
Genl. Char. Similar to M. lucifugus, but larger. 
Color. No appreciable difference in the color of this form and 
M. lucifugus. 
Measurements. Total length, 93.5—102; tail vertebra, 41-46; tibia, 
17.3-19.6; foot, 7.4-8.4; forearm, 38-40; thumb, 5.5-7; longest 
finger, 65-71; ear from meatus, 12—13.5; width of ear, g—10; tragus, 
7—8.2. 
PIPISTRELLUS comprises a number of very small bats with a 
rather peculiar dental formula for this family, viz., four upper incisors 
and four lower premolars, although in other families the same for- 
mula exists, as is witnessed in the members of the genus Noctilio of 
the Noctilionide. 
115. Pipistrellus. 
2—2, I—I, 2-2, as 
I C.—; P. M. — 
*3=3” It? a7 
Pipistrellus Kaup, Skizzirte Entwick.—Gesch. u. Naturl. Syst. d. 
Europ. Thierw., Th. 1, 1829, p. 98. Type Vespertilio pipis- 
trellus Schreber. 
