INSECTS AND OTHER ORGANISMS 403 



M 



Fig. 83. — ^A, First-stage Larva of Hypoderma bovis, X lOo. B, C, 

 pharyngeal sclerites {Ph), mouth-hooks {H) and median spine (M) 

 formed by union of parastomal sclerites (pa), X 250. D, hinder 

 region of larva, P.Sp., posterior spiracles ; Tr, air-trunks. X 250. 

 After Carpenter and Hewitt (Sci. Proc. R. Dublin Soc. 191 3, xiv). E, 

 mouth armature of fourth-stage (penultimate) larva, X 50 ; F, of fifth- 

 stage (final) larva, X 25 ; i/, mouth-hooks; M, median spine; h, hypo- 

 stomal sclerites; g, gullet; s, salivary duct. After G. B. Phibbs {Irish 

 Nat. xxxi, 1922). 



