ON THE LIFE HISTORY OF DGIMYA. 



21 



contents. This is mostly due to the presence of the injurious Uji. The 

 parasites in such diseased silkworms die with their host, and never 

 undergo their complete development. 



3rd. Sometimes the silkworm contracts its body before spinning 

 a cocoon, or if it begins one, gives it up and begins another afresh. 

 The silkworm thus atfected is called " Jijii," and harbours the Uji in 

 its interior. It will die after a longer or shorter struggle, ( PL III, 

 fig. 14 ). 



4th. Most of the silkworms which are able to spin only thin co- 

 coons are infested by the parasite, 



oth. Most of the silkw^orms which are dull and inactive before 

 spinning a cocoon harbour this parasite. 



6th. Those silkworms, one or more of whose segments are ex- 

 traordinarily dilated either before or after spinning a cocoon, contain 

 the maggot in the ganglia of the dilated segments. 



7th. Those silkworms which die while changing into pupa, or 

 those Avhich die after they have changed into pupa, have also the 

 parasite. 



8th. Those larvas or pupas which exhibit dark brown patches 

 around their stigma have the parasite just beneath that stigma (P/. 

 Ill, figs. 12-15). 



An interesting fact which is worthy of mention is that, if rainy 

 weather prevails during the fourth stage of the development of the 

 silkworm, the number affected by the parasite is large, while if fair 

 and dry weather prevails during the same period the number of the 

 parasites is much less. It is evident then that moisture is favorable 

 and warm dry air unfavorable to the development of the maggot. 



