TYPICAL BATS. 35 



in separate colonies of males and females ; such, at least, being 

 the experience of Mr. J. Gurney, who further states that the 

 number of females is greater than that of the males. Mr. 

 Harting mentions, however, that he knew of an instance where 

 a solitary pair of Noctules, taken from a hollow tree in the 

 Bishop of London's park at Fulham, proved to be male and 

 female. The same observer also draws attention to the cir- 

 cumstance that during repose, while the tail of the Horse-shoe 

 Bat is carried bent upwards and forwards over the back, in the 

 NocLule it is carried bent downwards and backwards between 

 the legs. 



IV. THE HAIRY-ARMED BAT. VESiPERUGO LEISLERI. 



Vespertilio leisleri^ Kuhl, Deutsch. Flederm. p. 38 (181 7). 

 Scotophilus leisleri^ Gray, Mag. Zool. vol. ii. p. 497 (1838); 



Bell, British Quadrupeds 2nd ed. p. 26 (1874). 

 Vesperugo leisleri, Keyserling and Blasius, Wirbelthiere Europ. 



p. 46 (1840); Dobson, Cat. Chiroptera Brit. Mus. p. 



215 (1878). 

 Characters. — Closely resembling in external form a small in- 

 dividual of the preceding species, the Hairy-armed Bat may be 

 distinguished by the following characters. Thus, whereas in 

 V. noctula the outermost pair of upper incisor teeth have their 

 basal transverse diameters equal to only half those of the outer- 

 most lower incisors, in the present species the two dimensions 

 are equal. Moreover, in the present species the lower incisor 

 teeth are arranged in a regular semi-circle, with scarcely any 

 overlapping of one over another, in place of being closely 

 crowded. Length of head and body about 2| inches; of tail, 

 if inch. 



In common with the Noctule, the present species has a band 

 of fine short hair running down the under side of the fore-arm 



D 2 



