314 University of California Publications in Zoology  [Vou.17 
County, July 2, 1912, two embryos; female, no. 18495; taken at Rum- 
sey, Yolo County, June 24, 1912, two embryos. Two examples of the 
Merriam bat secured by Dixon at Limekiln, Eldorado County, August 
2, 1916, weighed as follows: no. 24216, female, 4 grams; no. 24217, 
male, 3.5 grams. 
Genus Eptesicus Rafinesque 
According to Miller (1907, p. 208) this genus is represented in 
Africa, Madagascar, Australia, Asia (except the Malay region), and 
America from southern Canada southward (except the Lesser An- 
tilles). About forty-five species belonging to this genus are known. 
In North America only one species, consisting of several races, is 
known to exist. Among the species of the Vespertilionine group 
oceurring in California the one belonging to the genus Eptesicus may 
be readily distinguished by its comparatively large size (total length, 
105 to 122 millimeters), reduced dental formula, and nearly uniform 
brown coloration of the body. 
99) — = 2! 
Characters ——Dental formula: 1 —— sl II Se 
5-9) iar PM g=o) Masa 
Upper incisors both well developed, the outer one much the smaller, 
reaching barely to cingulum of inner one. Lower incisors almost 
uniform in size, forming a closely crowded convex row between the 
canines, with their crowns overlapping; the crowns tri-lobed, and that 
of the outermost slightly the largest. Canines, both above and below 
simple, each with distinct cingulum but no secondary cusp. Height 
of single upper premolar exceeds that of any molar. First lower 
premolar about half the size of the second. 
Skull flattened above; angle between brain-case and rostrum 
slight; sagittal crest conspicuous. (See pl. 23, fig. 52; pl. 24, fig. 60). 
Ears short (17 to 20 millimeters in height from meatus) and some- 
what narrower than long; basal lobe well developed but not excessively 
large, being in length about half height of tragus. Tragus straight, 
short (7 to 9 millimeters in height), and directed slightly forward, 
broadest near middle, and tapering to a slightly blunted point. Mem- 
branes nearly naked. Mammae two. 
Eptesicus fuscus (Peale and Beauvois) 
Large Brown Bat 
Vespertila fuscus Peale and Beauvois (1796, p. 14). Original description ; 
type locality, Philadelphia. 
Scotophilus fuscus, H. Allen (1864, pp. 31-35, figs. 27-29). Deseription; 
nomenclature; specimens listed from San Francisco and Posa Creek. 
Scotophilus fuscus, Cooper (1868, p. 5). Distribution. 
