312 Hereditji of MeJanhiii in Lep'uloptera 



experiment preventing me fmtn giving sufficient attention to the larvae, 

 and the sj^^^cial liability to disease from which this species suflers in con- 

 finement, and the usually fatal results which follow inbreeding, militated 

 against very full results. 



I have preserved all the specimens, however, and give a table of 

 results, as I fail to find a record of even this measure of success by 

 others in the continuous breeding and inbreeding of this species. 



The male parent of family 10.2 was raelanic and is recorded to have 

 been douhledayaria. The female parent is type. Of the offspring all 

 the 36 males and many of the females are undoubtedly intermediates. 

 Five of the females are so nearly black that it is difficult to place them. 



The offspring of 7 pairings from this femily were safely reared and 

 emerged June, 1912 (see table), and one pairing from these was successful, 

 and the resultant moths appeared June 1913. Pairings have been 

 again obtained and at the present moment a few descendants survive as 

 pupae. 



It is worthy of note that in the four families, each the offspring of 

 two intermediate parents, the type sjieciraens total 14 and the melanic 

 44 (approximately 1:3); and in the four families, each the offspring of one 

 type and one intermediate parent, the type and the melanic siiecimens 

 appear in about equal numbers (45 and 48). 



Totals ... 110 

 * Jl/= Melanic, but not ueceasaiily true black (doitbledai/aria}. 



Apparently, therefore, the M factor is not completely dominant but 

 seems to give either partial or complete blackening and the cause of 

 this difference between full melanism and intermediate must be left 

 open, but one point is clearly shown, namely, that clean Mendelian 

 segregation occurs (vide 12.2, ll.S, 11.20, 11.29 and 11.34). 



