182 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 3, NO. 4. 
detached. However, as the two instances of two young and two 
of those having three young were founded on embryological evi- 
dence we must find that this species may give birth to as small a 
number as two offspring. 
The average number of young of this as well as of other 
species of Lasiurus, which, with Dasypterus, as pointed out by 
Mr. Lyon, are distinguished from other bats by the possession of 
four mammae and the birth of more than the usual one or two 
young, is still a matter of doubt. 
