GENE MUTATIONS 



ble, the majority dying in cocoons. Females 

 were obtained, but were inviable and the stock 

 was discarded. 



POINTED, p (wings). In July, 1931, N. C. Bostian 

 (1931) X-rayed (dosage about 3200 .R units) a 

 wild-type mated female. One of the daughters 

 produced among her progeny twelve males with 

 pointed wings. The tips of the wings of this, 

 mutant type, both primaries and secondaries, 

 are narrowed and wrinkled, the narrowing being 

 especially, noticeable in the radial cell. Fe- 

 males are sterile: they sting caterpillars, 

 feed and lay eggs, living for several days, but 

 the eggs fail to hatch. Pointed males appear 

 in normal numbers from heterozygous mothers. 

 (Discarded) 



TRUNCATED, td (wings). In December, 1931, an 

 orange defective female, X-rayed (dosage about 

 2000 R units) as a five-day larva, was subse- 

 quently mated to a wild-type male. An Fl fe- 

 male produced among her progeny five males with 

 truncated wings. The first radial cell in the 

 primary wings of this mutant type is greatly 

 reduced, the wing is narrowed slightly, and the 

 outer margin assumes a squared appearance. The 

 trait is variable but easily recognized and does 

 not overlap with v/ild-type as does truncate, 

 previously described (P. V/. Whiting, 1932a). 

 Truncated females are weak, failing to sting 

 caterpillars or to oviposit. Truncated males 

 appear in normal numbers from heterozygous 

 mothers. (Discarded) 



47 



