THE HIDDEN TYPE OF WING-GROWTH 131 



only legless, like many of the larvae hitherto considered, but 

 has no definite head-capsule, so that it represents the extreme 

 of specialized degradation. The cuticle, soft and flexible, 

 allows the internal white fatty tissue to show through, so that 

 the maggot presents a pale creamy appearance. Its form is 

 tapering, the front end being narrow and the tail broad (Fig. 

 75, a, b). The mouth opens at the extremity of the cylindrical 

 anterior region which can be protruded and withdrawn as the 

 larva moves and feeds. Just above the mouth a pair of little 



FIG. 75. MAGGOT OF GREENBOTTtE FLY (Lucttid SericatO,) . 



a, sidejview ; b, dorsal view. x?4. c, front end (side view) 

 (as, anterior spiracle) ; d, mouth-hooks (side view) ; e, tail- 

 region, dorsal aspect ; /, tail region, ventral aspect, with 

 anal prolegs protracted. x 10. g, right tail-spiracle. x 20. 

 After Carpenter, Econ. Proc. R. Dublin Soc. I. 



sensory processes are situated, and from the mouth-opening 

 project the extremities of a pair of sharp, curved mouth-hooks 

 (Fig- 75> c d) which serve the maggot for tearing up its food. 

 These hooks are jointed to short, stout hypostomial sclerites 

 which at their hinder ends articulate with the large winged 

 pharyngeal sclerites on either side of the pharynx. Behind 

 the narrow mouth-bearing region eleven body-segments can 

 be distinguished, increasing in size towards the tail-end. 

 Most of these have rather prominently outstanding ridges on 



