BY T. HARVEY JOHNSTON AND M. J. BAN( ROFT. 



21 



out into a ])hint projection (fig. 1) varying somewhat in 

 length. This point is not obvious in the uterine egg (fig. 

 2). The h\rva on hatching is a tiny white segmented 

 creature which appHes its nioutli to tlie surface of the fly 

 pupa and gradually increases in size at the latters expense. 

 When the chalcid larva pupates, it assumes the form of the 

 adult, the structures being, however, soft and white and 

 surrounded by a clear envelope. During the pupation, 

 stage the hard chitinous cuticle of tlie hnago is developed.. 



Text-figures — camera lucida dra■^\ings. all to the same- 

 scale. 



Spalangia muscidarum : fig. 1, egg from fly jjupa? ; 2, 

 egg from uterus ; 3, 4, fore and hind wing of female : 5, 

 antenna of male ; 6, antenna of female : 7, third leg of 

 male. 



