38 



C. SASAKI. 



well as number and arrangements of tubercles on the segments, arc also very 

 similar to those of the wild silkworm; hut there are no colored symmetrical 

 markings on the body (tig. !)). 



The mature domestic silkworm is long cylindrical, and the length of the 

 body of our largest variety measures about <>•"> mm. The so called Kumako race 

 (race of two breeds) has a close resemblance to the wild silkworm both in its 

 coloration and the form and arrangement of its patches. Although this race 

 shows various modifications in color and markings, most of the individuals are 

 greyish brown, with a light greenish shade. Ihe first body segment is tinged 

 greyish yellow in its posterior half, just like the wild silkworm; 2nd has dor- 

 sally a central dark greyish brown patch with blackish lateral rims, and 2 lateral 

 blackish patches. The intervening line between the central and lateral mark- 

 ings is white, with a faint reddish shade. The 5th to 10th segments bear each 

 a -* shaped light greyish yellow marking ; but the latter is in most cases not so 

 well defined as in the wild silkworm (fig. 10, a, b, c). 



The 5th and 8th body segments bear a pair of imperfect oval patches which 

 are also found in the wild silkworm. That on the 5th segment is light dull 

 brown, and one end of a black line which does not completely surround the patch, 

 runs in towards the middle of the patch, thus dividing it into two portions, in one 

 of which lie 4 or 5 dull purplish dots, while in the other a few white dots. The 

 patch on the 8th segment is elongated oval or more or less so. It is also light 

 dull brown, and is sorrounded by a blackish line. In this patch lies a variable 

 number of dull purplish dots arranged in a single scries. 



In the race AkabiLi (a largely cultivated race of a single breed), the body is 

 white, and the posterior half of the 1st body segment is tinged yellow. The 

 markings of the 2nd as well as of the 5th and 8th segments are also distinctly 

 seen, but those on the latter two segments are more or less modified in different 

 individuals (tig. 11, a & b). 



In the race Kimai (race of greenish cocoon), the body is also white, the 

 marking on the 1st body segment is light. The central marking on the 2nd 

 segment is light greenish yellow, while the two lateral markings on the same are 

 represented each by a simple greyish dot. Each marking on the 5th segment 

 which is oval and light greenish in color, contains a hook shaped, light greenish, 

 curved line instead of dull purplish dots. That on the 8th segment is either oval or 



