10 



BOARD OF AGRICULTURE. 



VI. Orfhoptera (straight-wings). This order includes the 

 grasshoppers, true locusts, katydid, crickets, cockroaches, etc. 



Fig. u. The front wings are generally 



long and straight, somewhat 

 thickened, and in the male often 

 have some sort of musical ap- 

 paratus, as in crickets, katydids, 

 etc. The hind wings are broad, 

 fan shaped, and can be folded 

 up like a fan beneath the front 

 wings, which when folded gen- 

 erally lie lengthwise of the body, 

 forming a sort of roof. 



The mandibles and maxillae 

 are chewing organs. The larva& 

 have nearly the same form as the 

 adults, but lack wings ; they have 

 similar habits; the pupae are also active. Most of these 

 insects, except the Mantis, are injurious to vegetation by eat- 

 ing the leaves. 



VII. Neuroptera (nerve-winged). The dragon-flies, lace- 

 winged flies (Figure 15), May Kg. is. 



flies, Lepisma (Figure 3), and 

 white ants, belong to this order. 

 The wings, when present, are 

 thin, membranous, and subdivided by very numerous rods or 

 nervures into small spaces, which are often squarish. The 

 mandibles and maxilla are chewing organs. The abdomen 

 is generally long. The larvae are of many forms, often 

 aquatic, generally carnivorous and predacious in habits, and 

 usually undergo a complete metamorphosis ; the pupae are 

 mostly inactive. Most insects of this order, excepting the 



Figure 14. Katydid ( Cyrtophyllum concavum Say), male, natural szie. Color 

 bright green. From Packard's Guide. 



Figure 15. The Lace-wing Fly (Chrysopa oculata Say), natural size, with the 

 eggs attached to the tips of slender pedicels. Body light green. This insect 

 lays its eggs among plant-lice (Aphis), which the larvae, when hatched, destroy. 

 From Packard's Guide. 



