NO. 2 



DRAGONFLY LARVA — SNODGRASS 



33 



amounts to a remarkable degree of metamorphosis in an insect com- 

 monly said to be "hemimetabolous." 



The terminal structures of the larval abdomen and their adult equiv- 



FiG. II. — Terminal structures of odonate larvae. 



A Archilestes grandis (Rambur), end segments and gills B, Agrion virgo 

 L., end segments and apical lobes. C, same, base of apical lobe D, Cora sp, 

 abdomen of larva with vesicular apical lobes, ventral (from Calvert, 1911). 

 E, abdomen of young larva of Cahpteryx sp dorsal (from Heymons, 1904). 

 F Anax Junius (Drury), end segments and apical lobes G, same, end ot 

 abdomen with apical lobes spread.apart, showing three small ^>^^umanal valves 



Ayi, anus; Ccr, cercus ("cercoid") ; dl, dorsal gill, lobe; Eppt, epiproct, //, 

 lateral gill lobe; n, base of apical lobe of Agrion znrgo; Papt, paraproct; b, 

 sternum. T, tergum. 



alents are of interest because of the different interpretations of their 

 homologies that have been given to them. The three tapering horny 

 lobes that enclose the anus of the anisopterous larva (fig. 11 F) ap- 

 pear superficially to correspond with the epiproct and paraprocts of 



