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414 0. GORDON HEWITT. 



EXPLANATION OF PLATE 22, 



Illustrating Dr. C. Gordon Hewitt's paper on " The Structure, 

 Development, and Bionomics of the House-fly, Musca 

 domestica, Linn. Part III. The Bionomics, Allies, 

 Parasites, and the Relations of M. domestica to 

 Human Disease." 



Fig. 1. Mature larva of Homalomyia canicularis, L. X 17. 

 a.sp. Anterior spiracular processes, p.sp. Posterior spiracular apertures. 



Fig. 2. Posterior end of mature larva of Antliomyia r adieu m 

 Mg. an. Anus. 



Fig. 3. Anterior spiracular process of mature larva of A. radicum. 



Fig. 4. Head of Stomoxys calcitrans, L. ; left lateral aspect. 



Fig. 5. Posterior end of mature larva of S. calcitrans. 



Fig. 6. Posterior spiracle of the same, enlarged. 



Fig. 7. Posterior spiracle of mature larva of Musca domestica. 



Fig. 8. Posterior spiracles of first larval stage of Calliphora 

 ery throcephala, Mg. 



Fig. 9. Posterior spiracles of second larval stage of C. ery thro- 

 cephala. 



Fig. 10. Posterior spiracle of mature larva of C. ery throcephala. 



Fig. 11. Anterior spiracular process of mature larva of C. ery thro- 

 cephala. 



Fig. 12. Posterior end of mature larva of C. ery throcephala. 



Fig. 13. Chernes nodosus, Schr. X 30. 



Fig. 14. Thoraco-abdominal region of Homalomyia canicu- 

 ] aris, ? . showing Gamasids attached to the ventral side of the abdomen. 



Fig. 15. Longitudinal (sagittal) section of abdomen of M. domestica, 

 which has been killed by Em pus a muscse, showing the feltwork of 

 fungal hyphae filling the inside of the abdominal cavity and the pro- 

 duction of conidia in the intersegmental regions. X 12. c. Conidio- 

 phores producing conidia. /. Fungal hyphse. 



Fig. 16. Four conidiophores showing the formation of conidia (c.). 

 X 100 (approx.). 



Fig. 17. Conidium of Empusa muscse. X 400. o.g. Oil globule. 



Fig. 18. Habronema muscoe (Carter). Adult but immature 

 specimen, x 85. g.a. Genito-anal aperture. 



Fig. 19. Caudal end of Habronema muscse. X 360. 



Fig. 20. Tarsal joints of one of posterior pair of legs of Musca 

 domestica. Lateral aspect, to show densely setaceous character. 



