182 



ENTOMOLOGY 



FIG. 223. 



.-an 



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enings of the peripodal membrane which spread over the lar- 

 val hypodermis, while the 

 latter is gradually being 

 broken down by the leuco- 

 cytes ; in the head and abdo- 

 men the process is essen- 

 tially the same as in the 

 thorax, the new hypodermis 

 arising from imaginal buds. 



Most of the larval mus- 

 cles, excepting the three 

 pairs of respiratory muscles, 

 undergo dissolution. The 

 imaginal muscles have been 

 traced back to mesodermal 

 cells such as are always as- 

 sociated with imaginal buds, 



Hymenoptera and Lepi- 

 doptera. The internal 

 transformation in Hymen- 

 optera, according to Bugn- 

 ion, is less profound than 

 in Muscidse and more ex- 

 tensive than in Coleoptera 

 and Lepidoptera. The in- 

 ternal metamorphosis in 

 Lepidoptera resembles in 

 many respects that of Corc- 

 thra. In both these orders 

 the dorsal pair of protho- 

 racic buds is absent. In a 

 full-grown caterpillar the 

 fundaments of the imaginal 

 legs and wings (Fig. 221) 

 may be seen, the wings in a 

 frontal section of the larva appearing as in Fig. 222. Many 



Internal transformations of Sphinx ligus- 

 tri. A, larva; B, pupa; C, moth; a, aorta; 

 an, antenna; b, brain; f, fore intestine; 

 fr, food reservoir; h, hind intestine; ht, 

 heart; m, mid intestine; tnt, Malpighian 

 tubes; p, proboscis; s, suboesophageal gang- 

 lion; t, testis; tg, thoracic ganglia; v, ven- 

 tral nerve cord. After NEWPORT. 



