THE TWILKJHT BAT. 



649 



NYCTICEH'S IIUMKHALIS (Rnfinesque). 

 THE RAFINESQUE BAT ; TWILIGHT BAT. 



Vesperfilw humeralis Rafinesque, Amer. Monthly Mag., Vol 3, 

 p. 445, 1818. 



Xifcficeius humeralis Rafinesque, Journ. cle Physique, Vol. 88, 

 p. 417, 1819. 



Evermajin and Butler. Proc. Ind. Acad. Sci. for 1893, 

 p. 139, 1894. 



:\Iiller. X. Am. Fauna, No. 13, p. 118, 1897. 



Drscripfio)!. — Color dull brown, the hairs being plumbeous at 

 the base but the basal color shades gradually into that of the tip. 

 Under parts somewhat lighter than the back. The ears are small 

 and very thick and leathery ; wide at the base and tapering sharply 

 near the middle of the posterior edge; tragus short, blunt, and 

 much ])ent forward. 



The dentition readily distinguishes this species from all other 

 bats of this region. It has but one tooth on each side in front of 

 the large canine (but one incisor) and but one upper premolar. 

 In other respects the skull bears a rather close resemblance to that 

 of the red bat. The occipital crest is less elevated, however, and 

 the skull, on the Avhole, is less angular. 



The present species has never been reported from Indiana. It 

 was originally described from Kentucky, however, and is common 

 in the southern states as far north as Tennessee and central Ken- 

 tuck}'. In external appearance it bears a close resemblance to the 

 two species of Myotis found in this region and might easily be over- 

 looked among a large number of them. Unless its range is more 

 definitely restricted than that of most other species of bats, it will 

 certainly be taken in southern Indiana sooner or later. 



In addition to the characters given above, it may be distin- 

 guished from all of our species except the large brown bat, by the 

 tail extending distinctly beyond the interfemoral membrane. 



