i8o 



THE BIOLOGY OF INSECTS 



Among the two-winged flies (Diptera) all the larvae are 

 destitute of true legs, and in the house-fly and bluebottle 

 group (Muscoidea) the head-region becomes so much 



Fig. 50. — Larva of Honey Bee (Apis mellifica). A, side view, X 4 ; 

 zv, wing-buds seen through skin ; s, spiracles. B, ventral body- wall 

 with nerve-cord (w) exposed by dissection, X 12; 6, brain ; l^, /g, I3, 

 imaginal buds of legs, /, forewing and //, hind wing buds, in their 

 pouches; g, 8, 9, developing gonapophyses (processes of ovipositor) . 

 After J. A. Nelson {Journ. Agr. Res. U.S.D.A. xxviii, 1924). 



reduced as to be hardly recognisable. The maggot (Fig. 51) 

 of such a fly tapers from the broad tail to the narrow 



