44 



EXPERIMENTS WITH CERTAIX DIPTERA. 



Larvae in different stages of development may be 

 observed in the same fly. In some cases the discrepancy 

 in sizes was so marked — large forms being found in the head 

 and very small ones encysted in the fat body — as to suggest 

 that the smaller forms belonged to a subsequent infection. 



DETAILS OF INFECTION. 



No. of 

 Date. I days 

 in 

 cap'ty. 



No. of worms counted 

 from 



Head. Thor'xiAMo. 



Remarks. 



26/11/18 



12/12/18 



4/12/18 

 30/12/18 

 29/3/19 



2/4/19 



2/4/19 



S/4/19 



3/4/19 

 7/4/19 

 7/4/19 



15/10/19 

 9/1/20 



30 



14 



2 



1 



1 

 2 



2 

 6 



16/4/19 1 

 6/4/19 4 



aH regions 



I 

 94 

 infected 



1 



all regions 



all regions 



all regions 



all regions 



— i 8 



heavil y in- 

 fested] 



116 I 24 

 — • i infect. 



infecteid 



— linfect. 



— - infect. 



— ! infect, 

 infect ed 



infect' ed. 



i 

 infect. 



infect. 



infect. 



heaTil 

 fectr 



infect. 



y in- 

 ed. 



infect. 



2 small. 7 fully developed 

 larvae. 



all larvae fully developed 



larva full}- developed. 



total 234, all fully developed 



larvae in head fully developed 

 small and encysted in 

 abdomen. 



full}- developed. 



fully developed. 



very small encysted, Stage 1. 



small ency.sted, Stage 2. 

 small encysted, Stage 2. 

 fulh' developed in head and 



thorax, some small stages 



in abdomen. 



do. 



do. 



fairly large larvae, encysted. 

 Stage 3. 



very small larvae, encysted, 

 infection not heavy, iStage 1 



small, encysted, heavy iutec- 

 tiou, Stage 2. 



do. do. Stage 2. 



fully developed. 



Heavy infection, number* 

 fully developed, but must; 

 were small and encvoted. 



