PHYLUM ARTHROPODA 



335 



without a metamorphosis. The APTERA (p. 337, Fig. 259) are 

 ametabolous. 



The heterometabolous insects hatch from the egg and develop 

 into adults without passing through a true pupal period. In the 

 grasshopper, for example (Fig. 258), the young resembles the 



Ads 



FIG. 256. Alimentary 

 canal and glandular ap- 

 pendages of a beetle, Cara- 

 bus. Ad, anal glands with 

 vesicle; Chd, chylific ven- 

 tricle; Jn, crop; Mg, mal- 

 pighian tubule; Oe, oesoph- 

 agus ; Pv, proventriculus ; 

 R, rectum. (From Sedg- 

 wick's Zoology, after Du- 

 four.) 



FIG. 257. Longitudinal sec- 

 tion through the body of a moth, 

 Sphinx ligustri, showing the ali- 

 mentary canal of a sucking insect. 

 A, anus; At, antenna; E, rectum; 

 G, testis; Gi, subcesophageal 

 ganglion; Gs, brain; H, heart; 

 M, mesenteron ; MX, maxillae 

 forming proboscis ; N, thoracic 

 and abdominal ganglia; /, palp; 

 V, oesophagus ; V 1 , suctorial 

 stomach; Vm, malpighian tubules. 

 (From Sedgwick's Zoology, after 

 Newport.) 



