Formation of the Imago 123 



the air. A very important change which must take 

 place in the perfect insect after emergence is the 

 growth of the wings. These organs during the 

 stage just finished have been confined within the 

 narrow limits of the wing-rudiments of the pupa or 

 nymph. Quickly after emergence, therefore, the 

 insect makes its way to a place where the wings will 

 have space to attain their full size. A newly-emerged 

 Moth, for instance, usually climbs to some twig where 

 it can rest with 

 the wings hang- 

 ing downwards. 

 Blood and airflow 

 into the wing- 

 nervures,and the 

 organs of flight, 

 at first crumpled 

 and soft, soon 

 assume their 

 proper size and 

 firmness. 



Various devices 

 are necessary to 

 enable insects, 

 emerging from 

 pupae in enclosed 

 spaces, to reach 

 the outer air. 

 The caterpillars of certain Moths feed within the 

 wood of trees, and the pupa lie concealed in the 

 gallery bored in the trunk or branch. The pupa 

 is provided with rows of spines on the segments of 

 the hind-body, and several of these segments being 

 capable of motion, the creature is able to work its 

 way out of the burrow and protrude its head and 

 fore-body into the free air (77)' Pupae which remain 



8i. — Diagram showing position of imaginal 

 buds in larva of Fly. I. II. III. the three 

 thoracic segments of the larva; i. 2. 3. buds of 

 the legs of the imago; h. bud of head-lobes; f. 

 of feeler ; e. of eye ; b. brain. Adapted from 

 Korschelt and Heider, and Lowne. 



