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CAHPEN'i'Eii & Hewitt — Genitalia and Larva of the Warhle-fltj. 289 



PLATE XXV. Hypoderma lineakmi. Male. 

 Fig. 



26. Terminal abdominal segments and Genital Armature. Lateral view, x 50. The 



ejaculatory sac. (S.e.) presenting its dorsal aspect. 



26a. Tip of tenth abdominal tergum. Lateral view, x 50. 



27. Theca of Penis with Gonapophyses. Postero-ventral view, x 50. 



28. Terminal abdominal segments and Genital Armature. Ventral view, x 50. 



29. The same. Dorsal view, x 50. 



30. The Penis and associated structures. Lateral view, x 50 (Most of the pre- 



genital Sternum (St. 8) has been removed). 



In figures 26-30, the lettering corresponds with that of figs. 22-25. See 

 Explanation of Plate XXIV. 



PLATE XXVI. Hypoderma bovis. First-stage Larva and Egg-shell. 

 Fig. 



31. First-stage Larva. Lateral view, x 125. 



32. The same. Ventral view, x 125. The tail-end of the maggot is directed 



ventralwards. 



33. The pharyngeal sclerites (Ph.), mouth-hooks (H), and median spine (M). 



Ventral view. To the right the median spine (M) from the dorsal aspect, 

 showing its origin from the union of paired parastomal sclerites (pa), x 325. 



34. Terminal segment, with hinder spiracles (P. Sp.), surmounted by strong 



hook-like spines, x 325. 



35. Front end of Larva. Lateral view, x 325. The hodywall has been partly 



removed to expose the pharyngeal sclerites and mouth-hooks, x 325. 

 In figures 31-35, M., median spine; pa., parastomal sclerites; H., mouth- 

 hook; Ph., pharnyngeal sclerites; A. Sp., anterior spiracles; P. Sp., 

 posterior spiracles ; Tr., tracheal air-tubes ; A., anus. 



36. Anterior spiracle. Side view, x 560. 



37. Empty egg-shells after hatching of larvae ; two views showing slit at anterior 



pole. X 55. 



SCIENT, PKOC. R.D.S., VOL. XIV., NO, XIX. 2 Z 



