118 ARTHKOPODA. 



Wings not folded. 

 Jaws well developed. 



With wingless neuters ISOPTERA. 



No neuters. 



Antennae short, few-jointed ODONATA. 



Antennae longer, many-jointed 



Wings with few veins CORRODENTI A. 



Wings with many veins PLANIPENNIA. 



Jaws rudimentary or obsolete AGNATHI. 



Wings hairy TRICHOPTERA. 



CORRODENTIA. Antennae many- jointed. Wings few-veined. 

 Tarsi 2- to 3-jointed. 



The posterior wings of Psocidae are small or rudimentary, or 

 both pairs may be wanting. They live on dead animal and 

 vegetable matter, and are mostly arboreal in their habits. Atropos 

 pulsatoria is the pest of insect collections. Embiidse have moni- 

 liform antennae. They are vegetable feeders, and construct silken 

 galleries under stones. 



Psocidts. Embiidts. 



Psocus. Embia. 



Atropos = Troctes. Olyntha. 



Caecilius. Oligotoma. 



ISOPTERA. Antennae rather short, many -jointed. Wings very 

 large, equal. Neuters. 



The larvae and pupae resemble the neuters. These insects are 

 social in their habits, building large nests on trees and on the 

 ground, and are very destructive to woodwork. The female of 

 Termes bellicosus is said to lay 80,000 eggs in twenty-four hours. 



TermitidcB. 



Termes (White Ant). 

 Calotermes. 



PLECOPTERA. Antennae long, setaceous, many-jointed. Wings 

 subsimilar, folded longitudinally in repose. Jaws rudimentary. 



The larvae and pupae are aquatic ; the latter, except in wanting 

 wings, resemble the imago. Some species have caudal setae. 



Perlid(B. Isopteryx. 



Nemura. Perla. 



Capnia. Pteronarcys, 



