118 
Y. TANAKA. 
a) Common or normal yellow. The larva is normal or common- 
patterned and yellow-blooded, i. e. yellow cocooner. 
b) Normal white. All characteristics are the same with those of the 
first named, except that this is white-(colourless) blooded. 
c) Striped yellow. The full-grown larva is generally black, but with 
segmental white stripes; the blood is yellow. 
d) Moricaud yellow. The whole body of the larva shows a moricaud 
or darky appearance. Yellow-blooded. 
e) Plain yellow. The larva is destitute of distinct markings and is 
yellow-blooded. 
IVIendelian Factors Concerned in the 
Present Research. 
The Mendelian characters which are dealt with in the present experi- 
ments are as follows : 
S, Striped black. 
Zebra-patterned . 
Moricaud. 
Normal or common 
patterned. 
Yellow blooded, viz. 
yellow cocoon colour. 
Absence of S ; plain coat. 
” ” Z ; plain. 
” ” M ; plain. 
” ” N ; plain. 
” ” Y ; 
white cocoon. 
white blooded or 
Of the above-mentioned, the “presence” characters are, of course, dominant 
to the “absence” characters. Of the dominant factors, N is always hypostatic 
to S, Z and M. The inter-relations of the factors, S, Z and M are not 
yet fully tested, but I am inclined to think that these characters are nearly 
equipotent in their dominancy. 
All the characters given above are known tobe inherited independently 
of one another in normal cases. For instance, the yellow-cocoon (yellow blood) 
character and each marking character being due to the totally different genes, 
the latter can be found connected with or separated from the former. 
