594 
LITTLE BROWN BAT. 
Myotis luctfugus (Le Conte). 
Vespertilio luctfugus Le Conte, McMurtrie’s Ed. Cuvier’s Animal Kingdom, I., 
App:, 183i, p. 431. 
The httle brown bat is found throughout the whole of North 
America north of the southern boundary of the United States and 
between the Atlantic Ocean and the Rocky Mountains. 
Dental toramila 67, /o-G 4), yl, 3) .cetame) 
The length is 3.15—3.55 in. (80-90 mm.); fore arm, 1.50-1.54 in. 
(36-40 mm.). The wing-membranes are entirely naked except a 
narrow line close to the body. The ears are short for a bat, reach- 
ing barely to the tip of the nose when laid forward. 
The hairs are everywhere blackish slate at base. 
The general color is dull brown, varying from wood- 
brown to sepia, with a distinct gloss in certain 
lights. The under parts are lighter. 
The little brown bat and Say’s bat closely re- 
semble each other, but may be distinguished by 
the ears. The ears of the former (Fig. 6) when 
tte LOE ot bent forward do not reach the tip of thesm@ses 
(Miller.) ~" while those of Say’s bat (Fig. 5) reach beyond the 
tip, and its tragus is more slender than that of the 
little brown bat, and is also different in shape. 
Several bats of this species are preserved in a jar in’ the 
Laboratory collections, evidently having been found together some- 
where in the state, but collection data are wanting. The species 
has been reported from Cook county and from Cairo, in Alexander 
county, and is undoubtedly not uncommon throughout the state. 
SILVER-HAIRED BAT. 
Lastonycterts noctivagans (Le Conte). 
Vespertilio noctivagans Le Conte, McMurtrie’s Ed. Cuvier’s Animal Kingdom, I., 
iesxsjil jo), Sil. 
This species ranges throughout the United States and north to 
the Peace River at least. 
Dentalitormulat 722/026, 2/1 pit. =).69n. °/.. 
Ears (Fig. 7) short, nearly as broad as long, when laid forward 
reaching barely to nostril, basal lobe very large. Tragus short, 
