YOSHIMARO TANAKA 
1915 was almost exclusively done in the Imperial Institute of Sericulture at 
Fukushima. 
I wish to take this opportunity to express my heartiest thanks to Prof. 
Hatta and Prof. Goto for their kindness in looking through the manuscript, 
and giving many valuable advices. My obligations are also due to Prof. Suda 
and Prof. Toyama for the warmest courtesy shown by them in the course of 
the stud) - . 
II. THE GENETIC CONSTITUTION OF THE LARVAL 
PATTERNS: COMPLETE COUPLING OF Q WITH S AND M 
1) Pale-quail, Quail, Plain, Normal, Moricaud and Striped. 
The most common types of the larval pattern in the silkworm are eight, 
viz. 
Striped (striped black), Plain, 
Moricaud, Pale-quail, 
Normal, Zebra, 
Quail, Multilunar. 
The characteristics of these marking types are very distinct in usual cases. 
Of the elementary spots which enter into the markings, the most striking are 
the "eye-spots" or "eyebrows" on the mesothorax (II segment), and the an- 
terior semilunar spots on the V segment ; these spots are invariably present 
in common in the striped, moricaud, normal and quail. Pale-quail has faint 
"scmilunules" but no "eyebrows" ; plain is devoid of both ; multilunar is 
provided with "eyebrows" aud "semilunules" only when it is combined with 
the quail factor, while in zebrine type, the spots under consideration are, even 
in the absence of the quail factor, developed to a certain extent, though the 
spots are made markedly distinct by that factor. 
To the fundamental types just enumerated, a number of new larval forms 
can be added by combination of factors. For instance, striped-quail and 
moricaud-quail are extracted respectively from the offspring of the crosses 
striped x quail and moricaud x quail; likewise zebra-quail and multilunar-quail 
