H. Onslow 



135 



In the preceding tables the families in which these radiated in- 

 dividuals occur have been indicated by an asterisk. The number of 

 radiated individuals in these families is now given in the following table: 



Fawdlies containing the radiated varieties actinota and leucosticta. 



Imagines 

 Melanic Non-MelaDic 



The broods come from three different types of mating. The figures in 

 brackets against the radiated specimens denote the number of those 

 heavily radiated (var. actinota), the remainder are all var. leucosticta. 

 The most interesting fact to be noted is that all 43 radiated insects are 

 (^ (/ , not a single $ showing any trace of this character. The association 

 of this variation with maleness seems to be complete, for I am informed 

 by Mr Raynor that he has bred 104 specimens of var. actinota in 1920.. 

 and almost as many of var. leucosticta, and they do not include a single 

 female. Moreover, Porritt^ mentions a similar case (see Family 1906 in 

 the second table, p. 125) in which all the (/•(/ were radiated, but not a 

 single $ . Recently, however, this observer has bred fi^om radiated stock 

 a leucosticta $ . 



The greatest number of radiated individuals is found in family '19 E 

 which has 9 actinota ^^ ^ , but the study of the pedigree of this and the 

 other families gives no clue to the type of inheritance followed. When 

 a radiated insect is mated to grossulariata (i.e. family 18 0, see first 



1 Porritt, G. T., Ent. Mo. Mag. London, Vol. xliii. p. 12, 1907. 



