66 Gerald F. Hill : 



Seurat, L. G., 1915. — " Sur la niorphologie de rovijecteur de 



quelijues nematodes." Paris, C. R., Soc, Biol. Vol. 



LXXII., pp. 778-781. 

 Seuiat, L .G., 1915. — ** Sur les premiers stades evolutifs des Spir- 



opteres." (Mi. Soc. Biol. Vol. LXXVll., No. 17, pp. 561- 



565. 

 Seurat, L. G., 1916. — '* Contribution a I'etude des formes larvaires 



des nematodes parasites, Heteioxenes." Bull, sclent, de 



la France et de la Belg. ; Par. and Lond., 7.s., Vol. XLIX. 



(4), pp. 297-377. 



DESCRIPTION OF PLATES. 



Platk II. — Habhonkma muscae. 

 1. — Egg and embryos from female. , 



Fig 

 Fig 



Fig 

 Fig 

 Fig. 



2. — Embryos from faeces of horse. 

 3. — Embryo after six days' incubation in faeces. 

 4. — Embyio from a Musca domestica larva. 

 5-12 (inclusive). — Larvae from Muscae domestica pupae. 



Fig. 13. — Larva (anterior end) from a Musca domestica pupa. 



PlATI<: III. H. MUSCAK. 



Fig. 13a. — The* above (posterior end). 

 Fig 14. — Larva (anterior end) from Musca domestica fly. 

 Fig. 15. — Larva (anterior end), from Musca domestica fly. 

 Fig. 16. — The above (posterioi- end). 



Fig. 17. — Proboscis of House Fly (Musca domestica), showing two 

 larvae of Habronema muscae. 



All Figures, excepting 17, outlined by camera lucida. 



Figures 1-9 and ll-13a inclusive from life. 



Figures 10, 14, 15 and 16 from specimens fixed in alcohol and 

 mounted in glycerine jelly. 



Fig. 17, Photomicrograph. 



Plate TV.— H. microstoma. 



Fig. 18. — Egg and embryos from female. 



Fig. 19. — Embryo after five days' incubation in faeces. 



Fig. 20. — Embryo from a Stomoxys calcitrans larva. 



Figs. 21-23 (inclusive). — Larvae from Stomoxys calcitrans pupae. 



Fig. 24. — Larva from Stomoxys calcitrans pupa. 



Fig. 25. — The above in reduced scale. 



Fig. 26. — Larva from a Musca domestica fly. 



