ON THE LIFE HISTORY OF UGIMYA. O 



ment of the maggot into the matura insect, and on the manner in which 

 the maggot becomes parasitic on the silkworm. And as the result of 

 these investigations I also venture to suggest various measures which, 

 it is hoped, will prove efficient in protecting the silkworm from this 

 most destructive parasite. I am much indebted to Mr. Zengo Tsuge, 

 Vice-principal of Komaba Agricultural College who has allowed me to 

 use every instrument necessary for the present investigation. My 

 thanks are especially due to Dr. Kakichi Mitsukuri, Professor in the 

 Imperial University of Tokyo, who has helped me in various ways. 



I. 



External Characters and Habits of the Adult Fly. 



The mature insect of Ugimya Sericaria, Rondani (^fig. 1, fiij. 1 a 

 fig. 2 ) has a large stout body covered with black stiff hairs. The 

 length of the body and the expansion of the Avings differ with sex ; 

 thus, the measurement of twelve large males gives an average of 15 

 mm. for length, and of 30 mm. for the expansion of the wings, while 

 in an equal number of females the averages of the same dimensions are 

 14 mm. and 28 mm. respectively. 



The head is nearly triangular in shape. The large compound eyes 

 which it bears, are placed somewhat apart from each other so as to leave 

 a space between them on the dorsal aspect of the head. In this space, 

 three small simple eyes are situated. The antennae ( Fl. J, fig. à ) are 

 club-shaped and consist of three joints, of which the terminal is by far 

 the largest. A little distal to the junction of the terminal with the 

 middle joint is attached a long stiff black bristle {fig. é a) about twice as 

 long as the antenna itself. This consists of two joints: the proximal is 



