182 



ENTOMOLOGY 



FIG. 223. 



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 Muscidae 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 



Internal transformations of Sphinx ligus- tllC dorsal pair of prOtllO- 

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



an, antenna; b, brain; f, fore intestine; raC1C DUOS IS abSCllt. Ill a 



fr, food reservoir; h, hind intestine; lit, full-grOWll caterpillar the 

 heart; m, mid intestine; mt, Malpighian 



tubes; p, proboscis; s, suboesophageal gang- flllldamentS of tllC imaginal 



lion; t, testis; tg, thoracic ganglia; -v, ven- i i /T" 



tral nerve cord.-After NEWPORT. le g S aild mgS ( Fl ' 22 



may be seen, the wings, in a 

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



