34 



CESTRUS OYis, Linn. 

 Flats I. 



Fig. 1. Larva in the first stage. Dorsal view. 



Fig. 2. Larva in the first stage. Ventral view. 



Fig. 3. Head of larva in the first stage : a,, hooks hy which the parasite attacheg 



Itself to the mucous membrane. 

 Fig. 4. Tail of larva in the first stage : a, the stigmata or breathing pores. 

 Fig. 5. Hooks of well-developed larva. 

 Fig. 6. Hooks of very young larva. 

 Fig. 7. Larva) in various stages of growth ; natural size : a, a, a, fully developed 



larvae in the third stage ; 6, three-fourths developed ; candd, yet younger 



larvsB, possibly in the second stage ; c, the youngest found, and those from 



which figures from 1 to 4 were taken. 

 Fig. 8. Cephalic end of full grown larva (Brauer). 

 Fig. 9. Dorsal view of full grown larva (Brauer). 



Fig. 10. Caudal end of full grown larva (Brauer) : a, stigmata or breathing pores. 

 Fig. 11. Adult female fly with line indicating natural length (Brauer). 

 Fig. 12. Front view of head of the above (Brauer). 

 Fig. 13. Ventral view of full grown larva, showing the spines which enable the para7 



site to push itself along the smooth, soft mucous membrane. 

 Fig. 14. Pupa case dissected to show the Imago or young fly within (Eaillet). 

 Fig. 15. Eggs taken from fly (Eaillet), ' 



