LIST OF TEXT FIGURES 



FIG. 



1. Head of flesh-fly {S. ca?ymrni), dorsal view 



2. „ „ „ front view 



side view 



Wing of house-fly {Af. domestica) 



Abdomen of female house-fly showing the extended ovipositor 

 'Nymph' of M. domestica dissected out of pupal case . 

 Pupal case (puparium) of M. domestica from which the imago 

 has emerged ........ 



8. Blow-fly (C erytlirocephala) a short time after emerging from 



puparium showing unexpanded wings, and ptilinum pro- 

 truding in front of the head ...... 



9. An anthomyid fly immediately after emerging from the puparium 



showing the greatly distended ptilinum and unexpanded 

 wings .......... 



10 and II. Ventral and side views of the head of the same fly 

 12. Illustrating the effect that underfeeding has on the size of the 

 adult fly {Liicilia ccesar) 



Larva of F. caiiicttlaris ...... 



Part of right middle femur and tibia of F. caiiicutaris 



Larva of F. scalaris ....... 



Part of right middle femur and tibia of F. scalaris 



Eggs of house-fly, greatly enlarged .... 



Full-grown larva of house-fly, greatly enlarged 



Schematic longitudinal section of a fly . 



Side view of a pseudo-tracheal ring .... 



Two consecutive pseudo-tracheal rings 



Part of labellum showing prestomal teeth 



House-fly in the act of regurgitating liquid food . 



Bot, or larva of Gastrophiltis equi .... 



Mite from Stomoxys calcitrans (X50) 



26. Mites attached to abdomen of Lesser house-fly 



27. Chelifer, Chernes ttodosus ...... 



Hc7-petomo7ias calliphorce., Preflagellate stages . 



„ „ Transitional forms . 



„ „ Formation of post-flagellate stages 



Pterovialiis sp. from pupa of blow-fly 

 Braconid from pupa of flesh-fly .... 



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