VESPERTILIONID^. CXC. 331 



565. LASIONYCTERIS Peters. (\darios, woolly ; wKTfpts, bat; 

 night- watcher.) 



1091. L. noctivagans (Le Conte). SILVER BLACK BAT. 

 Tragus almost as broad as high, scarcely one-third height of ear ; 

 femoral membrane entirely though scantily furred ; fur long and 

 silky, black, usually with silvery tips to the hairs. L. 3-J-. E. 12. 

 T. H. U. S. generally, migrating south in winter; easily known 

 by its color. (Lat., nox, night; vagans, wandering.) 



566. PIPISTRELLUS Kaup. (Italian pipistrello, vispitrello, 

 dim. of vespertilio. bat.) 



1092. P. subflavus (F. Cuvier). Tragus slender, erect, half the 

 height of the ear; upper incisors about equal in size; femoral 

 membrane one-third furred; yellowish brown, brighter forwards. 

 L. 3. E. 9. T. U. N. Y. to Iowa and Texas ; chiefly southward. 

 Subspec. obscurus Miller. Color duller, less yellow. Lake George,. 

 K Y. 



567. VESPERTILIO Linnaeus. (Lat., bat, from vesper, 

 evening. ) 



1093. V. fuscus Beauvois. BROWN BAT. Tragus never 

 pointed, nearly half as high as ear ; wings naked ; interfemoral 

 membrane furred at base ; ear more or less turned outward ; upper 

 lateral incisors small, scarcely visible. L. 3 to 4. E. 12. T. 1. 

 Is rather smaller than the European V. serotinus. Me. to B. C., 

 S. to Ariz., common. (Lat., dusky.) 



568. NYCTICEIUS Rafinesque. (w, night.) 



1094. N. humeralis Rafinesque. TWILIGHT BAT. Ears small, 

 wide apart; a small wart above eye; fur rather scanty. Dark 

 fawn color above, passing into brownish below. L. 3J. E. 9. 

 T. l. Penn. to Mo. and S. W., common. 



569. LASIURUS Gray. (Xacrtos, woolly; ovpd, tail.) 



1095. L. borealis (Miiller). RED BAT. Fur long and silky, 

 reddish brown, mostly white at tip ; lips and ears not edged with 

 black; a whitish tuft at base of thumb, L. 3f. E. 12. T. If. 

 E. U. S. everywhere, very abundant ; known by its reddish color. 



1095 b. L. cinereus (Beauvois). HOARY BAT. Much larger. 

 Rich chocolate-brown, overlaid with white ; lips and ears marked 

 with black. L, 5. E. 14. T. 2. U. S,, rather northward, mi- 

 grating south in winter, rare. (Lat., ashy.) 



570. CORYNORHINUS Harrison Allen. (Kopvvr), club; piv, 



nose.) 



1096. C. macrotis (Le Conte). BIG-EARED BAT. Known 

 by its large size and very large ears. Blackish; fur soft and 



