414 
C. GORDON HEWITT. 
EXPLANATION OE PLATE 22, 
Illustrating- Dr. C. (Jordon Hewitt’s paper on “The Structure, 
Development, and Hionoinics of the House-fly, Mu sea 
doniestica, Linn. Part III. The Bionomics, Allies, 
Parasites, and the Pelations of M. dornestica to 
Human Disease.” 
Fig-l. — Mature larva of Homalomyia canicularis, L. X 17. 
Anterior spiracular processes. Posterior spiracular apertures. 
Fig. 2. — Posterior end of mature larva of Antliomyia radicum 
Mg. an. Anus. 
Fig. 3.— Anterior spiracular process of mature larva of A. radicum. 
Fig. 4. — Head of Stonioxys caleitrans, L. ; left lateral aspect. 
Fig. 5. — Posterior end of mature larva of S. caleitrans. 
Fig. (5. — Posterior spiracle of the same, enlarged. 
Fig. 7. — Posterior spii-acle of mature larva of Mu sea dornestica. 
Fig. 8 . — Posterior spiracles of first larval stage of CalliiDhora 
ery tlirocepliala. Mg. 
Fig. 9. — Posterior spiracles of second larval stage of C. erythro- 
cephala. 
Fig. 10. — Posterior spiracle of mature larva of C. ery tlirocepliala. 
Fig. 11.— Anterior spiracular process of mature larva of C. erythro- 
cepliala. 
Fig. 12. — Posterior end of mature larva of C. ery tlirocepliala. 
Fig. 13. — Che rues nodosus, Schr. X 30. 
Fig. 14. — Thoraco-ahdominal region of Homalomyia canicu- 
lar is, $ . showing Gamasids attached to the ventral side of the ahdoiiien. 
Fig.l.'i. — Longitudinal (sagittal) section of ahdonien of M. dornestica. 
which has hcen killed liy Enipusa niuscai, showing the feltwork of 
fungal hyplia; filling the inside of the ahdomiiial cavity and the pro- 
duction of conidia in the intersegniental regions, x 12. c. Coiiidio- 
phores producing conidia. /. Fungal liypluc. 
Fig. 10. — Four conidioiihoies showing the formation of conidia (c.). 
X PlO (approx.). 
Fig. 17.— Conidium of Empusa muscai. X 400. o.y. Oil glohule. 
Fig. 18. — Hahronema miiscai (Carter). Adult hut immature 
specimen. X 85. f/.a. Genito-aiial aperture. 
Fig. 19. — Caudal end of Hahronema miiscai. X 360. 
Fig. 20.— Tarsal joints of one of posterior pair of legs of Musca 
dornestica. Lateral aspect, to show densely setaceous character. 
