128 MR. L. DOXCASTER AXU UEV. G. H. RAYNOR OX [Feb. 20, 



Table VI. — Plain sordiata X prunaria. 



No. of Exp. $ PAHENT. 



(? PAEENT. 



Oppspeing. 



04.20 

 34 



28 



I speck. sorcJ. $. speck, .wri^. ? 

 ? pi. sord. ex 03.3 X S prim, ex 03.4 j 8 5 



? prun. ex 03.4 X <? pi. sord. ex 03.3 

 Total 



11 



11 



Table VII. — Speckled sordiata x plain sordiata. 



No. of Exp. 



? PARENT. S PAEENT. 



Offspring. 



i 



104.23 



33 



35 



? spec, ex 03.3 X <? plain ex 03.3 

 „ X 



„ ., X „ 



plain 



sord. S . 



2 



5 



4 



plain speck. 

 sord. 5 . .sord. ,$ . 



•2 6 

 1 



speck. 

 sord. ? . 



3 



1 



Total 



11 



2 7 



i 

 4 1 



From these tables I think it is sufficiently clear that the 

 banding of the sordiata is dominant over its absence in pruna7-ia, 

 but that the speckling of prunaria is at the same time dominant 

 over the plain orange of the pui-e sordiata, giving a heterozygote 

 which is both banded and speckled {PI. VIII. fig. 2). The plain 

 S07'diata, however, may have some specks along the wing-rays, 

 so that an exact determination of the numbers of " plain " and 

 " speckled " is not possible. The numbers of these two classes 

 in the tables ai-e therefoi-e appi-oximate. 



The numbers are not sufficiently large to show whether the 

 different types occur in the proportions demanded by Mendel's 

 Law, with the exception of those in Table III. Here thei-e ai-e 

 148 prunai'ia to 110 sordiata, where eqviality is expected; but 

 the mortality is so great among the yoinig larvae, and also during 

 hibei-nation, that a veiy small differential moi'tality will account 

 for this. 



The work was partly midertaken to find out whether there 

 was any tendency for a correlation of either of the types with one 

 or other of the sexes, but no evidence whatever of this has 

 appeared. 



It is important to notice that no intemnediates occuired ; in 

 fact the darkest prunaria bred were from two pi-nnaria parents, 

 and the lightest sordiata from sordiata parents. 



