2 



C. SASAKI. 



was Adams, (i) and more recently Rondani, (2) Guerin Meneville, (^) 

 Coronalia, (*) have published notes on the subject. liaberlandt also 

 gives a few facts in his book " Der Seidenspinner." Pryer in his 

 catalogue of Lepidoptera of Japan says under the heading of Bombyx 

 mori, " I have noticed that the Uji, a diptera which is parasitical 

 upon it and causes an, immense amount of damage, deposits its eggs 

 about the larva on the leaves, and not on the insect." 



In 1873, my father Mr. N. Sasaki attempted to study the maggot 

 and finding it in the main tracheal trunk of the silkworm directly 

 beneath a stigma, concluded that the maggot gains this place by enter- 

 ing the stigma from outside, and is introduced into the breeding room 

 by means of the eggs which are deposited on mulberry leaves. 



In the Japan Times of May 4th 1878, Mr. G. A. Greeven makes 

 the following statement: — "My experiments have now shown me 

 that the hatching of the Uji takes place in the stomach of the cater- 

 pillar, and that it immediately forces its way through the membrane of 

 the stomach, and makes a path for itself to a stigma * * *." 



On account of the immense loss sustained every year by the sericul- 

 turist from the ravages of this parasite, the Principal of Komaba Agri- 

 cultural College suggested to me the idea of making a thorough stud}'' of 

 the habits and life-history of the fly, with the purpose of discovering, if 

 possible, some means of protecting the silkworm from it. 



My investigations on this subject were begun in 1883 and con- 

 tinued during two following years, and are principally on the develop- 



(1) Adams — Deuxième rapport sur la sericulture au Japon — V. Eevue universelle de 

 sericulture Lyons, No. 36, Avril 1870. 



(2) Eondani Prof. Camillo— L'Ugi ; estrattodel Bolletino delComizio Agrario del mese 

 di Aprile 1870, No. 4. 



(3) Guerin Meneville F. E. — Observations sur la nature de I'Oudji, parasite des vers 

 à soie au Japon, présentés a l'académie des science dans sa Seance du 18 Avril 1370. V. 

 Comptes-Rendus et revue universelle de sericulture. No. 3, Avril 1S70. 



(4) Dott. E. Coronalia-L'Ugi o il Parasita del filugello al Giappone. 



