GYNANDROMORPHS IN HABROBRACON. 115 



The evidence does not prove although it is consistent with 

 the theory that male parts are from one ootid, female parts 

 from a fusion of another ootid and the male pronucleus. 



Intersexes. 



The fundamental distinction between gynandromorphs and 

 intersexes is that the former are genetic mosaics while in the 

 latter all parts of the body are presumed to be of similar genetic 

 constitution. Male and female parts of gynandromorphs occur 

 in distinct regions while intersexes are either male with a greater 

 or less female tendency or female with a greater or less male 

 tendency. 



Intersex, freak 193, occurred in a male brood, hence in all 

 probability from an unfertilized egg. It is therefore to be 

 considered as an intersexual male. 



Intersexes, freaks 273, 274, 275, occurring in one culture, 

 differ from a gynandromorph in that the male and female regions 

 are not definitely defined. They are considered to be male 

 intersexes although their short antennae may indicate that they 

 are gynandromorphs with female heads. 



Freak 271, a sib to freaks 273, 274, and 275, with male head, 

 male responses and female abdomen should be regarded as a 

 gynandromorph. Its irregular sternites and relationship to inter- 

 sexual males may indicate that it is also intersexual. 



Behavior of Gynandromorphs. 



Responses of mosaic males and of impaternate females do not 

 differ from responses of normal males and females respectively. 



The fourteen gynandromorphs and one intersex of Habrobracon 

 tested may be grouped with respect to responses as follows: 



(i) Typically male. Juglandis freaks 246, 247, 248, 249, and 

 267 were definitely and strongly male. Juglandis freak 255 was 

 definitely male but failed to mount females. This failure may 

 be due to injury of antennas by ether. Juglandis freak 250 and 

 brevicornis freak 269 were strongly male but each of these was 

 seen to pierce the cotton plug with its sting, a reaction charac- 

 teristic of females. The meaning of this reaction is not clear as 

 it is not known what males would do if they had stings. Brevi- 



