224 GENETIC STUDIES ON THE SILKWORM 
are usually of very nearly the same colour intensity, while the posterior 
"semilunules" are less conspicuous both as regards size and tint, and are often 
absent in lighter normal. 
In certain strains, however, the "eye-spots" and anterior "semilunules" 
are unequally developed, either the former or the latter being more intensely 
pigmented than the other. This peculiarity is transmissible. 
From the summer culture of 1914, I selected a number of normal-pattern- 
ed larvae with "eye-spots" of pQ- subtype and anterior "semilunules" of PQ 1 
and mated them among themselves. The normal offspring produced by these 
matings were 257 in number in A 141 '15, and 243 in A 145'! 5 and all bred 
true in having the "eye-spots" darker than the anterior "semilunules". Simi- 
lar result was obtained with the lots A 147' 1 5, A 373' 1 5 and A442'i5 (Figs. 
63. 64). 
On the contrary, there are some strains in which the "eye-spots" are 
markedly lighter than the anterior "semilunules". For instance, the quails 
(55 in number) in A 674'! 5 were as regards the "eye-spots", but q 2 in re- 
spect of "semilunules". A Japanese race Arayahime is plain or lightest 
normal so far as the "eye-spots" are concerned, but traces of "semilunules" are 
always present and darker in colour than the "eye-spots". The said family 
A 674'! 5 was, in fact, the offspring of a crossing of Arayahime and pale-quail. 
A 142'! 5 and A 372' 1 5 belong also to this category (Figs. 65, 66). 
In various strains of normal, there is occasionally met with a peculiar 
type which is provided with third semilunular spots on segment IX, as large 
as the second (posterior "semilunules") (Fig. 62). In the summer of 19 14, I 
separated the larvae of this type from those of the ordinary type in the fami- 
lies C 29— i,2,3,4'i4 and mated them among themselves, with the following 
results. Two matings of the ordinary type gave 564 individuals (A 6d'i 5), of 
which 460 were normal, 54 quail, and 50 plain and pale-quail not a single larva 
being provided with the third "semilunules". A mating of the individuals 
with "semilunules" on segment IX, gave 223 offspring in all, of which 161 indi- 
viduals were normal, and 62 plain (A 59'! 5). Not only all the normal of this 
