370 University of California Publications in Zoology {|Vou.17 
Leneth of skull shehtly more than twice its greatest width; ros- 
trum more than half length of brain-case; angle between rostrum and 
brain-case very slight, in fact whole dorsal profile nearly straight; 
sagittal crest but slightly developed; zygomata not expanded at 
middle; palate slightly arched. 
iss = 9-9 = = 
Dental formula: is, e =. pm 529 or = m = — 30 ore2or 
Upper incisors long and slender, nearly one-half height of upper 
canines and diverging slightly near their tips. Lower incisors tall, 
slender, and crowded in a semicircular row beneath projecting cingula 
of canines; crowns of lower incisors bifid and one-third wider than 
columnar shafts. Canines large and robust (see pl. 20); height of 
upper canine about one-third more than antero-posterior diameter at 
cingulum; anterior face slightly grooved, and inner face somewhat 
coneave ; lower canines slightly smaller than upper, but similarly pro- 
portioned. First upper premolar, if present at all, minute and closely 
crowded between canine and second premolar. Posterior upper pre- 
molar with crown area more than half that of first molar and exceed- 
ing it in height. Lower premolars with crowns about as long as 
broad; that of second slightly exceeding that of first in height. 
Molars not peculiar in form; crowns of lower exceed those of upper 
in height. In Nyctinomus the upper incisors are wide apart at their 
bases, with converging tips, whereas in Hwmops the upper incisors 
are in contact at their bases, diverging toward the tips. 
One species of Humops has been recorded from California. 
3 
Eumops californicus (Merriam) 
California Mastiff Bat 
Molossus californicus Merriam (1890, pp. 31-32). Original description; 
type locality, Alhambra, Los Angeles County, California. 
Molossus californicus, Bryant (1891a, p. 359). Nominal. 
Molossus californicus, J. A. Allen (1891a, p. 198). Distribution; relation- 
ships. 
Promops perotis californicus, H. Allen (1894, pp. 175-182, pls. 36-38). 
Description. 
Promops californicus, Elliot (1901, pp. 422-423, fig. 94). Description; 
distribution. 
Promops californicus, Miller and Rehn (1901, p. 271). Type locality. 
Promops californicus, Elliot (1905, p. 498). Geographic distribution. 
Promops californicus, Stephens (1906, p. 275). Description; distribution. 
Eumops californicus, Miller (1906, p. 85). Description (as type species 
of new genus). 
Eumops californicus, Miller (1912, p. 71). Type locality. 
Eumops californicus, J. Grinnell (1913b, p. 283). Range in California. 
Diagnosis.—Size large (total length 157 to 184 millimeters) ; ears 
very broad, united above nostrils, directed forwards rather than 
upwards; tail exserted far beyond edge of interfemoral membrane ; 
upper incisors in contact at their bases, diverging toward tips. (See 
pl. 19, figs. 19-20; pl. 20, figs. 21-23.) 
