ON THE LIFE HISTOEY OF UGIMYA. 



11) 



and when it licas become 2 to 5 mm. long or even larger in size, it gets 

 free and passes into the body cavity of the silkAvorm. After travel- 

 ling through the mass of fat which occupies the greater portion of this 

 cavity, it directly searches for the portions of the tracheal system of its 

 host, where the stigmata open. On reaching one of these places, it 

 forces its way into the chamber directly inside the stigma, and forms a 

 sort of a cup ( PL III, fig. 10 h) for the reception of its body by heap- 

 ing up the fats and muscular fibres of its host round the opening made 

 on enterino- and stickin«' them too;ether with its saliva. The mouth of 

 this cup ( PL III, fig. 10 e ; fig. 11. ) is directed toward the body cavity, 

 while its bottom opens into the stigma ( PL III, fig. 10 c ) of its host. 



The maggot ( PL III, fig. 10 a) which rests in the newly-formed 

 cup, projects its anterior end into the body- cavity from the mouth of the 

 cup, while its posterior end ( PL III, fig. 10 d ) is directed towards the 

 bottom of it. In this position, the maggot anteriorly consumes fat as 

 its food, and posteriorly respires with the air which enters through tha 

 stigma. 



The cup which the maggot thus inhabits has a dark brown color 

 partly produced by the action of the saliva upon the fats and muscles 

 which build up the cup, and partly by the faeces which the maggot voids. 



When a cup thus colored is formed inside a stigma, there appears 

 a dark brown or brownish-black patch around the stigma ( PL III, fig, 

 12 a; fig. 13 a; fig. 14 a); so that the presence of the patch is a conclusive 

 evidence of the fact that the silkworm is infested by this parasite. The 

 similar marking which occurs on the body of a pupa enclosed in a 

 cocoon is also due to the same cause ( PL III, fig. 15 ). 



As the maggot grows in size, the cup is able to enlarge in propor- 

 tion, and the maggot remains in this abode until it attains its full 

 maturity, no matter whether the silkworm meanwhile turns into a 

 pupa or not 



