LEISLER'S BAT 



87 



premolar is relatively larger, and the lower incisors, being smaller, are less 

 crowded and do not usually overlap (Figs. 7, p. 86, and 16, No. i, p. 174). 



No material exists upon which to base any account of either the 

 individual or exceptional variation of this species, but Moffat informs 

 me that there are two melanic examples in the Dublin Museum. 



Geographical variation, as in N. noctula, shows itself mainly in 

 regard to size and cranial characters, especially in the relative 

 development of the crests (for particulars, see above, p. 54). I have 

 carefully compared the Irish and English specimens in the British 

 Museum, but cannot distinguish them. 



* 111 inches in the flesh, fide B. Patterson, corroborated Independently by Whitaker, who gives the 

 average wing-expanse of six Yorkshire females as 304 {Natwralist, 1907, 386). 



