444 C. GORDON HEWITT. 



1862. ScHlNER, J. R. — ' Fauna Aust,riaca : die Fliegen.' 2 vols., Wien. 

 1895. Sharp, D.— " Insects," part ii, ' Cambridge Nat. History,' London. 

 1906. TuLLOCii, F. — "The Internal Anatomy of Stonioxys," 'Proc. Hoy. 



Soc.' (Ser. B.), vol. Ixxvii, pp. 523—531, 5 figs. 

 1906. Wescue, W. — "The Genitalia of both Sexes in the Diptera, and 



their relation to the Armature of the Mouth," 'Trans. Linn. Soc.,' 



vol. ix, pp. 339—386, 8 pis. 



TuE University, 



Mancuester. 



EXPLA.NATION OF PLATES 22— 2G, 



Illustrating Mr. C. Gordon Hewitt's paper on " The Structure^ 

 Development, and Bionomics of the House-fly (Musca 

 domestic a, Linn.). Part I. Anatomy of the Ply." 



PLATE 22. 



Fig. 1. — Musca domestica. Female. 



Fig. 2. — Anthomyia radicum. Female. 



Fig. 3. — Honialomyia canioularis. Male. 



j^iG. 4. — Stomoxys calcitrans. Female. The halters of this species 

 have been drawn too far back, and in this and the other species the nervurcs 

 of the wings have been made thicker than they naturally are. 



These figures are not drawn to the same scale. 



PLATE 23. 



Fig 1. — Interior of the head of M. domestica. In this figure the left 

 side of the head capsule and of the proboscis have been removed and the 

 compound eye of the same side, leaving the optic ganglion (pcriopticon). All 

 the tracheal structures have been omitted. 



ax. Anterior cornu of fulcrum, a.f.h. Accessory flexor muscles of hau- 

 stelluni. ap. Apodcme of labrum. an.n. Antennal nerve. C.G. Cc|ilialic 

 ganglion. cU.l. Dilator muscles of labium hypopliarynx. d.ph. Dilator 

 muscles of pharynx, d.s. Discal sclerite. ex.h. Extensor muscle of hau- 

 stellum. F. Fulcrum. /. Furca. f.c. Fat-cells, f.h. Flexor muscle of 

 haustellum. //. Flexor muscle of labrum-epipharynx. (/.p. Gustatory 

 papillaj of oral lobes, k. Hyoid sclerite of pharynx. Ib.u. Labial nerve. 

 Ib.sl. Labial salivary gland, l.hp. Labium-hypopharynx. l.cp. Labrum- 

 epipharynx. mxp. Maxillary palp. ccs. Gisophagus. ocji. Ocellar nerve. 

 ph.7i. Pharyngeal nerve, p.c. Posterior cornu of fulcrum. P.O. Periopticon. 

 ps. Pseudotrachca. PI. Ptiliuium. r.d.s. lletractor muscles of the discal 



