CLASSIFICATION OF INSECTS. 



293 



rest, these are folded both in a transverse and longitudinal direction. 

 The anterior wings are of a denser texture, resembling leather or parch- 

 ment. To this order belongs the common House-cricket (Gryllus domes- 

 ticus), of which, as well as of its eggs, larae, and pupa, figures are here 

 given (fig. 145). 



(759.) 3rd Order. Dictyotoptera* . This order comprises the Cock- 

 roaches, in which the wings are four in number when they exist ; but 

 they are generally of equal size, and never folded. 



Fig. 145. 



Gryllus domesticus. 



(760.) II. INSECTA METABOLA. The larva is a worm either with or 

 without legs. The pupa is quiescent ; or if it moves, it does not eat. 



(761.) 4th Order. Neuroptera-f. Insects having four equally large 

 or equally long wings with reticulated nervures, and mouths provided 

 with strong lateral jaws. The most perfect examples of this order are the 

 Dragon-flies (Libellula), the largest of the insect inhabitants of our own 

 country. The perfect insect (fig. 146), equally remarkable for its beau- 

 tiful form, powerful flight, and carnivorous habits, is among the most 

 formidable tyrants of its class ; while the Iarva3, which abound in our 

 ditches and stagnant pools, are eminently destructive to their aquatic 

 companions. The larva (fig. 147, B) possesses six articulated legs ; 

 while the pupa (A), which certainly forms an exception to the general 

 rule given above, is not only furnished with rudimentary wings, but is 

 eminently rapacious, and possesses in the structure of its mouth, to be 



s, reticulated ; Trrepbv, a wing, 

 f I'evpov, a nerve ; 



