THE GENETICS OF HABROBRACON JUGLANDIS ASHMEAD 



at the end of the fifth tarsal segment involv- 

 ing lack of claws (Fig. 9). Wings of footless 

 tend to be more or less wrinkled. Footless 

 males appear in good numbers from heterozygous 

 mothers. The females drink honey, but cannot 

 ■feed on caterpillars or lay eggs. The males 

 mate readily but experience much difficulty in 

 walking and are unable to climb. A recurrence 

 of this mutant is described by P. W, Whiting 

 (1935b). This mutation again appeared in the 

 summer of 1945 in the progeny of an X-rayed 

 female, 



LUMPY, Ip (legs). In the summer of 1934 a sin- 

 gle male, with legs resembling beaded, appeared 

 in the offspring of a wild-type female that had 

 been X-rayed (dosage about 4000 R units). The 

 mutant was discarded soon after its appearance. 



WOOZY, wz (legs). A wild-type female X-rayed 

 (dosage about 4500 R units) in the summer of 

 1934 produced in her offspring several males 

 with leg segments abnormally dark. Some of the 

 male offspring on the other hand were noticed 

 to have leg segments practically without pig- 

 ment. The wings in most cases were cupped over 

 the body. This mutant type was found to be in- 

 viable at 30° C. and to overlap with normal 

 wild-type at room temperature. Both sexes were 

 fertile and of normal viability. (Discarded) 



Many of the foregoing mutations, such as 

 fused, are semi-lethal and would be lethal ex- 

 cept for laboratory care in feeding and mating. 

 However, a number of mutations have occurred 

 which have their effect at a time or to such a 

 degree that their possessor cannot eclose or 



66 



