ORTHOPTERA. 119 



III. WALKERS. (Orthoptcra ambulaloria.) 



To this division belong various insects, mostly found in warm 

 climates, and displaying the most extraordinary forms. Some of 

 them are furnished with wings, which, by their shape, and the 

 branching veins with which they are covered, exactly represent 

 leaves, either green, or dry and withered ; such are the walking- 

 leaves, as they are called, (Phy Ilium pulchrifolium, si cci folium, 

 &c). Others are wingless, of a long and cylindrical shape, re- 

 sembling a stick with the bark on it, while the slender legs, stand- 

 ing out on each side, give to these insects almost precisely the 

 appearance of a little branching twig, whence is derived the name 

 of walking-sticks, generally applied to them. The South Amer- 

 ican Bacteria arumatia, rubispinosa, and phyllina, and two spe- 

 cies of Diapheromera 9 described and figured in Say's "American 

 Entomology," under the names of Spectrum femoratum and bi- 

 vittatum, are of the latter description. These insects are very 

 sluggish and inactive, are found among trees and bushes, on 

 which they often remain motionless for a long time, or walk slowly 

 over the leaves and young shoots, which are their appropriate food. 

 The American species are not so numerous, and have not 

 proved so injurious as particularly to attract attention. 



IV. JUMPERS. [Orthoptera sallatoria.) 



These are by far the most abundant and prolific, and the most 

 destructive of the Orthopterous insects. They were all included 

 by Linnaeus in his great genus Gryllus, in separate divisions, how- 

 ever, three of which correspond to the families Jlchetadas,* 

 Grylliadm,] and Locustiadaz,^ in my "Catalogue of the Insects 

 of Massachusetts," and may retain the synonymous English 

 names of Crickets, Grasshoppers, and Locusts. These three 

 families may thus be distinguished from each other. 



1. Crickets (Achetad^e) ; with the wing-covers horizontal, and 

 furnished with a narrow, deflexed outer border ; antennas long and 



* Gryllus Jlcheta, Linnaeus. t Gryllus Tettigonia, L. 



t Gryllus Locusta, L. 



