166 JOURNAX. OF ENTOMOLOGY AND ZOOLOGY 



ward in the inside of the head. The two upper ones are the dorsal 

 processes of the cephalo-pharyngeal sclerite, and the two lower ones, 

 the ventral, which consist each of a loop. 



The prothoracic stigmas are chitinous in structure. Each bears 

 five digits, resembling the fingers of a hand; besides the stigma 

 there is a spiracle (Figs. 5, 6, Plate I). 



At the posterior end are two horny stigmal plates. There are 

 three smaller oval plates on each of them. These smaller ones are 

 much thicker, each has a slit across the middle. Close to the large 

 stigmal plate there is a round spiracle (Figs. 8 and 9, Plate I), 



Data on season of transformation, etc. — About 3,300 galls have 

 been examined for studying the transformation of the fly larvs. 

 This study was carried from September, 1913, to the same month 

 of the next year. All the galls examined from the beginning of this 

 work till July, 1914, were the ones formed in the summer of 1913. 

 In June, 1913, the new galls were starting to grow. Since then, 

 they were also opened and examined till September. The trans- 

 formations of the fly larvae at different seasons throughout the year, 

 including all the other occupants, are given in the following table: 



