LVIII. 



Northern Red-bat or Tree-bat, 



Lasturus borealis (Muller). 

 (Gr. lasios, hairy; oura, tail; L. borealis, of the North.) 



Vespertilio borealis MuLLER, 1776, Natur. Syst., Suppl., p. 21. 



Lasiurus borealis MiLLER, 1897, N. Am. Fauna, No. 13, p. 105. 



Type Locality. — New York. 



French Canadian, la Chauve-souns rouge. 



In addition to the Family and sub-family characters, the 

 genus Lasiurus (Gray, 1831) has the tail densely hairy above, 

 continuous with the back furring; the ear broad, low, and 

 round-topped; mammae, 4; teeth: 



T i-i i-i 2-2 , ^-x 



Inc. ; can. ; prem. ; mol. =^2 



3-Z I -I 2-2 ^-T, 



Total length, 4 to 4I inches (102 to in mm.); tail, about size 

 2 inches (about 51 mm.); forearm, i\ to if inches (38 to 41 

 mm.); tibia, about | inch (about 19 mm.); spread, about 12 

 inches (305 mm.). 



In size it is much like the Silver-haired Bat (see Fig. 

 264). 



The colour of the Red-bat is usually described as a bright colour 

 rufous or dull orange. This, however, conveys no idea of the 

 exquisite tints that go to make up the general tone of red. The 

 Manitoba specimen before me is, first, all over of a delicate, pale 



1183 



