336 University of California Publications in Zoology |Vou.17 
Genus Euderma H. Allen 
This genus, as at present known, consists of a single species, found 
only in the southwestern United States. 
Characters.—Kars very large, about three-fourths as long as fore- 
arm, joined across forehead by band of membrane; nostrils simple, 
facial portion of skull narrow and pointed, the brain-case quadrate, 
flattened above, but rising abruptly at frontal border; zygomata 
abruptly expanded at middle; auditory bullae very large, and much 
elongated, their greatest diameter about equal to length of tooth-row 
exclusive of incisors. 
2a =i 2-2 3-3 
3-37 “1-1 P™ 9-9 ™ 3-3 
cisors alike in form, slender, with well developed cingula, and simple 
styliform crowns, the inner somewhat larger than the outer, which 
is In contact, or nearly so, with canine. Lower incisors trifid, middle 
lobe largest, especially in second and third. Upper canine small 
and weak, barely more than twice height of inner incisor, which it 
rather closely resembles in form. Lower canine relatively smaller 
than in any other known Vespertilionine bat, its crown searcely higher 
than that of fourth lower premolar. Anterior upper premolar 
minute, scarcely more than one-third as large as outer incisor and 
rising barely to cingulum of canine; in the tooth-row it stands at the 
middle of the narrow space between the canine and large premolar, 
and in form resembles the incisors, but its crown is relatively lower 
and thicker; large premolar of usual form, but very deeply coneave 
on anterior border. Lower premolars of ordinary Vespertilionine 
type; molars normal. [As no skull of Euderma is at hand, the above 
description has been adapted from Miller (1907, pp. 225-227). | 
Comparisons.—In length of ears and form of skull and teeth this 
genus is said to resemble Plecotus and Corynorhinus, but its simple 
nostrils are of the Myotis type. 
Dental formula: i 
= 34. Upper in- 
Euderma maculatum (J. A. Allen) 
Spotted Bat 
Histiotus maculatus J. A. Allen (1891a, pp. 195-198). Original deserip- 
tion; type locality near Piru, Ventura County, California. 
Histiotus maculatus, Bryant (1891b, p. 113). Nominal. 
Histiotus maculatus, H. Allen (1892, pp. 467-470). As type of the new 
genus Huderma. 
Buderma maculatum, Bryant (1892, p. 220). Nominal. 
Euderma maculata, H. Allen (1894, pp. 61-64). Description. 
Euderma maculatum, Miller (1897b, pp. 46-49, pl. 3, fig. 3). Description. 
Euderma maculata, Elliot (1901, p. 398). Description; distribution. 
Euderma maculatum, Miller and Rehn (1901, p. 265). Type locality. 
Euderma maculatum, Elliot (1904b, p. 283). Reference to type locality. 
Euderma maculatum, Elliot (1905, p. 490). Distribution. 
Euderma maculatum, Stephens (1906, p. 264). Description; distribution. 
