76 



LOWER PTERYGOTA 



Throughout a large part of the country is found the 

 handsome Libellula lyiichcUa, shown in Fig. 36. It is a 

 large species with pruinose body, and the wings are each 

 conspicuously marked with three black patches. This 

 species is seen very frequently flying over low meadows and 

 in the vicinity of ponds and rivers. Judging by the abun- 

 dance of the adults it must be one of the quite important 

 species as affecting the aquatic life, and the adults must 

 dispose of many troublesome pests. 



Fig. 37. — Leucotermes flavipes: a, adult male; b, terminal abdominal 

 segments of same from below; c, same of female; d, male, side view, some- 

 what inflated by treatment with ammonia; e, abdomen of female, side 

 view; /, tarsus, showing joints and claw; a, d, e, enlarged; b, c, f, greatly 

 enlarged. (After Marlatt, Div. Ent., U. S. Dept. Ag.) 



Order ISOPTERA. 



This order is characterized particularly by the thickly 

 net-veined wings which fold flat upon the back and by the 

 biting mouth parts and incomplete metamorphosis. 



The order includes one family, the Termitida?, in which 

 there is a remarkable separation of habits, the species living 

 in communities and showing much the same kind of adap- 



