616 D. KEILIN 
The calcospherites are already present in very young larvae, 
but not in the embryo or in those just hatched ; they seem to 
TrExt-Fiq. 2. 
Agromyza sp., full-grown larva, slightly compressed, showing 
by transparency 120 calcospherites disseminated throughout the 
body. 
TEXT-FIG. 3. 
0 
so 
6° 
G5 boo 
dp92395, 
SE ee 
02mm. 
Agromyza larva, a portion of the fat body, /, showing the 
calcospherites, c. 
appear only after a short period of feeding. The existence of 
calcospherites in larvae belonging to the families Phytomy- 
zinae and Agromyzinae seems to be so general that this character 
