300 University of California Publications in Zoology  |Vou.17 
simple, each with a distinct but rather small cmgulum. First upper 
premolar minute; second slightly more than half height of canine. 
First two lower premolars minute, being less than half the height 
of the third. 
Skull (pl. 21, fig. 33, and pl. 22, fig. 45) broad and somewhat 
flattened; rostrum three-fourths width of brain-case, and strongly 
coneave on each side back of nasal aperture. 
Ear short, nearly as broad as long, and with a well-developed basal 
lobe. Tragus short, straight, and bluntly rounded. 
Lasionycteris noctivagans (Le Conte) 
Silvery-haired Bat 
V [espertilio|. noctivagans Le Conte (1831, p. 481). Original description; 
no type locality designated. 
Scotophilus noctivagans, H. Allen (1864, pp. 39-42, four figs. in text). 
Description; listed from Fort Reading (in Shasta County). 
Scotophilus noctivagans, Cooper (1868, p. 5). Distribution. 
S[cotophilus|. noctivagans, Cooper (in Cronise, 1868, p. 442). Occurrence 
in California. 
Vesperugo noctivagans, Dobson (1878, pp. 238-239). Description; general 
distribution (includes California). 
Vesperugo noctivagans, C. H. Townsend (1887, p. 182). Record of speci- 
men secured at Fort Reading by Dr. J. F. Hammond. 
Vesperugo noctivagans, Bryant (1891la, p. 358). Nominal. 
Lasionycteris noctivagans, H. Allen (1894, pp. 105-111, pls. 13-14). De- 
scription. 
Lasionycteris noctivagans, Miller (1897b, pp. 86-87). Description; dis- 
tribution; listed from Nevada City and Nicasio. 
Lasionycteris noctivagans, Elliot (1901, pp. 407-408, fig. 85). Diagnosis; 
distribution. 
Lasionycteris noctivagans, Stone (1904a, p. 579). Summer record from 
Mt. Sanhedrin. 
Lasionycteris noctivagans, Stephens (1906, pp. 268-269). Description; 
distribution. 
Lasionycieris noctivagans, Seton (1909, p. 1168). Map showing record 
stations and hypothetical range. 
Lasionycteris noctivagans, Miller (1912, p. 60). General range. 
Lasionycteris noctivagans, J. Grinnell (1913b, p. 279). Range in Cali- 
fornia. 
Diagnosis ——Total length 92 to 107 millimeters; ears short and 
rounded; color blackish chocolate, both above and below, many of the 
hairs tipped with silvery white. 
Description: Head.—Rostrum broad, two-thirds width of brain- 
case; width between nostrils greater than distance from mouth to 
top of rostrum; prominent glandular masses on each side of rostrum. 
Ear short (height from meatus, 15 to 16 millimeters) and broad 
(width, 11 to 14 millimeters) ; when laid forward reaching barely to 
nostrils. Tragus a little less than half height of ear. 
