THE OPEN TYPE OF WING-GROWTH 85 



elongate wing-rudiments which extend as far as the seventh 

 segment of the hind-body. This is the characteristic resting- 

 stage in the life-history ; the feelers lie backwards resting on 



FIG. 46. DEVELOPMENT OF BEAN THRIPS (Heliotflrips fastidtus). 



a, egg; b, c, first and second instars ; d, nymph with wing-rudiments ; 

 e, resting nymph ("pupa"), x (a) 40, (b) 70, (c, d, e), 45. After 

 Russell, Ent. Bull., 118, U.S. Dept. Agric. 



the dorsal aspect of the head and prothorax, and the insect 

 remains quiet and motionless until the final moult ushers in 

 the adult winged condition. 



