426 p. W. WHITING 



b. Defective palpi. Defects in the palpi are likewise heredi- 

 tary, but irregular in appearance. 



A pair of moths both of which had defective palpi produced 

 48 moths with normal palpi. 



A pairing of a normal male with a female having both palpi 

 small and a pairing of a male having both palpi small with a 

 normal female produced 189 normal and 12 cleft. No defects 

 in palpi appeared. 



A cleft male paired with a normal female produced 142 normal, 

 77 males and 65 females; 5 cleft, 2 males (1 with defective geni- 

 talia) and 3 females ; 6 with defective palpi (3 of which had both 

 short), 4 males and 2 females, and 6 with tongue cleft to base 

 and palpi both short, 3 males and 3 females. There were 5 with 

 cleft tongue but normal palpi, 6 with normal tongue but defective 

 palpi, and 6 with cleft tongue and defective palpi. The corre- 

 lation of defects in palpi with defects in tongue is unusual. More- 

 over, the shortening of both palpi rather than asymmetry is not 

 the usual condition, but is here seen in 9, at least, of the 12 

 individuals with defective palpi. 



Many large fraternities bred from normal had a very few moths 

 with defective palpi, while many others showed none at all. The 

 heredity of defects in palpi appears to be rather complicated. It 

 has as yet been impossible to correlate the condition with any 

 environmental effect. 



C. Tests for linkage of cleft, black, and sooty 



Two black females with deeply cleft tongue were selected from 

 the black-producing cultures. One was paired with a gray nor- 

 mal male from the same culture from which she was taken. 

 There were produced 95 gray normal. The pair was recorded 

 as (105). The other black cleft female was paired with a gray 

 sooty moth with normal tongue from the Calvert stock. There 

 were produced 89 gray normal. Records were not kept in 

 reference to sooty. The pair was recorded as (109). 



The data given in the remainder of this paper deals ^ with the 

 descendants of pairs (105) (type male by black cleft female) 

 and (109) (sooty male by black cleft female). 



