﻿LASIONYCTERIS. 



85 



others made no attempt to escape, except to crawl up the trunks of the trees, where 

 they remained until dark. Some of the young ones failed to find their way back to 

 the building, and remained about^the spot for several days. 



Genus LASIONYCTERIS Peters. 



1864. Scotophiliis'H. Allen^ Monogr. N, Am. Bats, p. 27 (part, not Scoto2}hilus heach, 1821). 



1865. Lasionycteris Peters, Monatsber, K. Akad. Wiss. 



Berlin, p. 648. Type J'esjyerttlio noctiragans 

 Le Conte. 



1870. CnephmopMlus'FityAngQ.T, Sitzungsber. K. Akad. 

 Wissensch., Wien, LXII, Abth., I, p. 8 (part). 

 Vesperkles Coucs in Coues' and Yarrow's Zool- 

 ogy of Wheeler's Exped., p. 83. Type Ves- 

 pertilio noctivagans Le Conte. 

 Vesperngo Dobson, Catal. Chiroptera Brit. Mus., 

 p. 183 (part). 



1893. Lasionycteris H. Allen, Monogr. Bats N. Am., p. 

 104. 



1875. 



1878. 



Fia, 18. — Skiill of Lasionycteris noc- 

 tii-agans (X2.) 



Tyve species. — Lasionycteris noctivagans (Le 

 Conte). 



Geographic distribution. — The range of the 

 genus Lasionycteris is the same as that of the type and only known 

 species. 



. 1 X. ,.2-2 1-1 2-2 3-3 

 Generic characters. — Dental formula : 3 3 ? ^7 j P'^^^j 3 3 ? 3 3""^^* 



Skull (fig. 18), flattened; rostrum very broad in proportion to brain 

 case, strongly concave on each side back of the nasal aperture; dorsal 

 profile of skull nearly straight and sloping gradually from external 

 nares to occiput, which is scarcely angular, and always without sagittal 

 crest. Ears short, nearly as broad as long; when laid forward, reaching 

 barely to nostril; basal lobe very large. Tragus short, straight, and 

 bluntly rounded at tip, width much more than half length of anterior 



margin. Back of in- 

 terfemoral mem- 

 brane furred on basal 

 half. Mammae, 2. 



General remarks. — 

 Among the Ameri- 

 can Vespertilionidw 

 the genus Lasionyc- 

 teris is readily distin- 

 guished by its dental formula, combined with its short, broad ears, 

 broad tragus, and partially furred uropatagium. 



The genus Lasionycteris is peculiar to North America, where it is 

 represented by one widely distributed species whose characters are 

 remarkably constant throughout its range. 



Fig. 19.— Teeth of Lasionycteris noctivagans (X5). 



