10 



BOARD OF AGEieULTURE. 



YI. OrtJioptera (straight-wings). This order includes the 

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

 Fig. 14. 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 larvae 

 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 ^ig- 1^. 



fflies, 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 maxillae 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 szic. Color 

 bright green. From Packard's Guide. 



Figure 15. — The Lacc-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 [Aplds), which the larva3, when hatched, destroy. 

 From Packard's Guide. 



