BATS 61 



to emerge and drop into the net at the rate of about four per minute. As 

 darkness came on the animals came out faster and faster. The net was 

 taken down at 8:00 o'clock after which still more were seen to emerge 

 from the w^all, circle about a bit, and then fly away. The gable of the 

 church which harbored the bats also housed a swarm of bees and a Red- 

 shafted Flicker. 



Fig. 7. Pacific Pallid Bat; from fi'eshly collected specimen, natural size. Snelling, 

 May 26, 191.5. 



Of the bats captured, 1 male and 19 females were saved as specimens. 

 The male was not in breeding condition. Fifteen of the females contained 

 2 embryos each, 3 had 1 embryo and 1 none. Many of the embryos were 

 of such large size as to indicate that they would have been born very soon. 



Mexican Free-tailed Bat, Nyctinomus mexicanus (Saussure) 



Field characters. — Size medium, more than twice size of Little California Bat, de- 

 cidedly smaller than Large Brown Bat. (See fig. 8 and pi. 21.) Total length about 

 4 inches (97-103 mm.), tail about ly^ inches (32-40 mm.), hind foot less than i/^ inch 

 (7-12 mm.), ear about Mi inch (13-14 mm.), spread of wings 111/2 to 12 inches. Color- 

 ation dull dark brown above, paler on under surface; flight membrane, ears, and muzzle 

 blackish. The terminal half of the tail projects behind the edge of the flight membrane 

 (fig. 8), a character not shared with any other species of bat in the Yosemite region. 

 Musty odor characteristic. 



