INSECTA. 233 



the transformations, as well as the principal forms, to which allu- 

 sion will be made in subsequent pages. 



I. INSECTA AMETABOLA. The larva resembles the perfect 

 insect, but is without wings. The pupae of such species as have 

 wings in their imago state possess rudiments of those organs. 

 The pupa runs about and eats. 



a. With sucking mouths composed of four fine setae lying in 

 a sheath. 



1st Order. Hemiptera* In such insects of this order as pos- 

 sess wings, which when present are always four in number, the 

 anterior or upper pair are generally coriaceous in their texture for 

 one half of their extent, while the posterior portion is thin and 

 membranous ; a circumstance from which the name of the order is 

 derived. The Notonecta or water boatman, {fig' 101) is a 



Fig. 101. 



familiar example ; c and D represent immature, and F mature 

 larvae. The pupa, G, H, differs little in outward form from the 

 perfect insect E, but possesses only the rudiments of wings. 



/3. Having mouths furnished with jaws, or distinct mandibles 

 and maxillae. 



2nd Order. Orthoptera."^ In this order the perfect insect pos- 

 sesses four wings, the posterior pair being the largest ; and, when 

 at rest, these are folded both in a transverse and longitudinal 



* wfjuffus, half ; frtgov, a wing, t O^of, straight, 



