1918 | Grinnell: A Synopsis of the Bats of California 
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4’. No fold of membrane extending from the inner third of the 
femur to the middle of the tibia. 
5. Length of forearm more than 50 millinreters. 
Nyctinomus depressus :‘ 
5’. Length of forearm less than 50 millimeters. 
Nyctinomus mexicanus 3 
2’. Tail extending at least to edge of interfemoral membrane, but never 
much beyond (see pl. 18). 
6. Nostrils opening forward beneath a conspicuous horseshoe-shaped 
ridge (see text-fig. U). 
7. Length of forearm more than 52 millimeters; color of back yel- 
lowish drab brown; habitat west of the desert divides. 
Antrozous pacificus 3 
7’. Length of forearm less than 52 millimeters; color of back whitish 
drab-gray; habitat east of the desert divides. 
Antrozous pallidus 
6’. Nostrils not opening beneath a horseshoe-shaped ridge. 
8. Dorsal surface of interfemoral membrane furred, at least on 
basal half (see pl. 17, fig. 10). 
9. Total length greater than 120 millimeters. | Nycteris cinerea 
9’. Total length less than 120 millimeters. 
10. General color ranging from rufous red or fawn to yellowish 
gray. Nycteris borealis teliotis 
10’. General color blackish chocolate. Lasionycteris noctivagans 
8’. Dorsal surface of interfemoral membrane naked except for scat- 
tering hairs, or furred only at extreme base. 
11. Height of ear from crown more than 25 millimeters. 
12. Tragus broadly rounded at tip; back blackish with three 
white patches (see pl. 16, fig. 9). Euderma maculatum 3: 
12’. Tragus slender, pointed at tip (see text-fig. S); color not 
blackish and no white markings present. 
13. General color wood brown; habitat the arid portions of 
the Upper and Lower Sonoran zones in southern 
California. Corynorhinus rafinesquii pallescens 
13’. General color, natal brown; habitat the Upper Sonoran 
zone in western California. 
Corynorhinus rafinesquii intermedius : 
11’. Height of ear from crown less than 25 millimeters. 
14. Tragus short, blunt, and curved forwards (see text-fig. L). 
15. General aspect of fur pale grayish; habitat Sonoran zones 
east of the desert divides. 
' Pipistrellus hesperus hesperus 
15’. General aspect of fur pale brownish; habitat Sonoran 
zones west of the desert divides. 
Pipistrellus hesperus merriami 
14’. Tragus not curved forwards, slender. 
16. Total length more than 105 millimeters. Eptesicus fuscus 
16’. Total length less than 105 millimeters. 
17. Ear when laid forward extending 7 to 10 millimeters 
beyond nostril. Myotis evotis 
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300 
os 
a 
340 
305 
311 
314 
291 
