( 22 ) 



elusion is inevitable that a large proportion of such companies 

 is the normal occurrence. On the other hand, the figures 

 suggest that all-male companies are not normally produced. 

 Males, however, were more numerous than females in all the 

 bisexual batches except Company 6 and Family 3 ; and the 

 males often emerged earlier than the females. The common 

 occurrence of the unisexual companies obviously promotes 

 interbreeding, and the advantages of interbreeding, acting as 

 selective criteria, may have increased the tendency to produce 

 nothing but females as scon as it appeared. 



These results have been submitted to Mr. L. Doncaster, 

 who agrees with Prof. Poulton in thinking it probable that the 

 lyoia form, although far commoner in the district, is recessive. 

 Mr. Doncaster wrote, September 26: "On the data available I 

 am inclined to think encedon is dominant. The Family 2 from 

 parents t x Company 1 is hardly explicable on any other view, 

 and, as you say, the existence of several pure h/cia broods 

 lvi] 

 Suggests it Btrongly. The arguments fur the dominai 



lyoia appear to be th«- brood from Company 7 (but out of a total 



of .sixteen ii 18 not very unusual to get such departures 

 from the expected 1 : 1 ratio), and the tact that lytia is the 

 common form in the locality. This, however, is not of great 



weight ." 



Mr. Doncaster baa suggested, and Prof. Poulton lias for- 

 warded to Mr. Lamborn the lines of future experiments, which 



it is hoped will throw more light on the Mendelian relation- 

 ship-, and, above all, on the unisexual broods of this 

 interesting Aerasa. 



Tm: Proof bi Breeding thai A.craea aurivillii, Staud., 

 is im: Female or A. aloiopb, Nkw.— Prof. Poulton ex- 

 hibited a scrie> of eight -I. cUciop* and five -I. mtri ciilii hied 



in the preaenl year by Dr. <;. I >. II. Carpenter from thirteen 



small larvae found on a single leaf of the food-plant on 

 Damba Island, in the Victoria Nyanza to the east of Entebbe. 

 The result entirely confirmed the conclusions of Mr. Bltring- 

 ham and Dr. Jordan, as published in the Proceedings for 

 November 17, 1909 (pp. lxvii lxix). 



