28 



C. SASAKI. 



spindle-shaped body on the cord of the 2nd and 3rd pair, tlie former 

 ( PL V, fig. 5f) seems to correspond to the " untere prothoracalscheibe" 

 and the latter {VI. P", fig. 5g)to the "untere mesothoracalscheibe " 

 which Weismann has described in the same larva. 



All the pairs following are directed posteriorly. The first 

 {Fl. F, fig . 5 4: ^ of these pairs which is really the 4th nervous cord, 

 lying far apart from the rest which follow it, passes into the fourth 

 segment, while each of the remaining pairs which are regularly 

 arranged on( 

 respectively. 



VI. 



The Pupa and its Development into the Mature Insect. 



As the maggot makes its exit from the cocoon of a silkworm, it 

 immediately searches for dark places, especially for moist ground by 

 getting down through some cracks or fissures in the floor of the house 

 where it comes out. When it has gained a suitable locality, it bores 

 into it with the aid of its hooked jaw. Having reached the depth of 

 two or three inches or even more beneath the surface, it begins to 

 contract in length and then changes into a cylindrical puparium tinged 

 light yellow ( Fl. V, fig. 7 ). It is slightly smaller at the anterior 

 than at the posterior end. The puparium, which is really formed 

 out of the larval skin, gradually hardens, and loses the wrinkles which 

 were previously visible. We can still, however, distinguish the seg- 

 ments of the maggot. 



This newly formed puparium of light yellow, has its color 

 soon changed into crimson red, which deepens gradually until at 



