RACES AND CHARACTERISTICS 7 



ness in transmission (in pure matings) were the important matters of 

 silkworm differentiation rather than the geographical or historical or 

 commercial relations of the various races. Therefore no list of the 

 races with their particular characters will be given, but instead will be 

 given a catalogue and description of the various characteristics of 

 eggs, larvae, cocoons and adults. These descriptions can be made brief 

 because of the careful illustrations (see Plates I and II) which will 

 readily give a clear understanding of the character conditions. 



Egg characters. 



Adhesive (i. e., sticking, when oviposited, tightly to the object on 

 which they are deposited). Characteristic of all races used except 

 the Bagdad race. 



Non-adhesive (i. e., eggs loose, unattached to the paper of the 

 mating box). Characteristic of the Bagdad race. 



No other egg characters have so far been made use of in my 

 studies. 



Larval characters (last larval instar). 



White without darker pattern. Characteristic of several races, 

 as Chinese White, and others, (PI. I, figs, i, 7; PI. Ill, figs, i, 5.) 



White with certain regular but few markings, as Bagdad, etc. 



(PI. I, fig. 3-) 



White with well marked darker pattern. Characteristic of Jap- 

 anese White and others, (PI. I, fig. 4; PI. Ill, figs. 3, 7,) 



Tiger-banded (i. e., black or black-brown transverse segmental 

 bands). Characteristic of a sub-race of Italian Salmon race. (PI. I, 

 fig. 2; PI. Ill, fig. 2.) 



Moricaud (i. e., a close pattern of black-brown lines all over the 

 body so as to make the whole larva a "darky"), A sport which has 

 appeared in several races in our laboratory, as Italian Yellow, Bagdad, 

 etc., and which has been established in our laboratory as a nearly pure 

 sub-race of Bagdad. (PI. Ill, figs. 4, 8.) 



Cocoon characters. 



White; characteristic of Bagdad, Japanese White, Chinese White 

 and other races, (PI. IV, figs, i, 2, 3, 4,) 



Yellow, of various shades from lemon to golden; characteristic 

 of Istrian, Italian Yellow, and other races, (PI. IV, figs. 8, 9.) 



Salmon, or pale yellowish pink; characteristic of Italian Salmon 

 race. (PI. IV, figs. 13, 14, 15.) 



Green; characteristic of Japanese Green race. (PI. IV, fig. 7.) 



