THE GENETICS OF HABROBRACON JUGLANDIS ASHMEAD 



sembling those of normal males. Sclerotization 

 of the abdomen is progressively heavier anteri- 

 orly, approximating the condition found in the 

 female. Gynoid females are indistinguishable 

 from wild-type. The trait acts as a recessive 

 in heterozygous diploid males (P. W. V/hiting, 

 1943b). This mutant is highly fertile and vi- 

 able in both sexes. 



SHORT, sh (antennae). In the summer of 1934, 

 in the offspring of an X-rayed wild-type female 

 (dosage about 4500 R units), a male was found 

 with reduced antennal length. The mutant short 

 resembles tapering, but the antennae are very 

 much smaller. Both sexes are fertile and of 

 normal viability. (Discarded) 



STUBBY, sb (antennae). Males with antennae 

 seven to nine segments long v/ere observed in 

 the offspring of an X-rayed wild-type female 

 (dosage about 3500 R units). This mutant first 

 appeared in the summer of 1934. The homozygous 

 females for the mutant have antennae with five 

 to seven segments. These few segments may be 

 fused together giving the appearance of one or 

 two large segments forming the antennae (Fig. 

 8). Both sexes are fertile with males of nor- 

 mal viability. : 



STUBBY-ABNORMAL, sba (antennae). Males with ab- 

 normally long stubby antennae were observed in 

 a homozygous stubby stock. Breeding tests have 

 shown that stubby and stubby-abnormal are allel- 

 ic. Both males and females are fully fertile 

 with normal viability. 



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