346 MOTIONS or INSECTS. 



wings, and the female glow-worms neither wings nor 

 elytra. 



Many persons are not aware that the insects of the 

 next order, the Dermaptera, can fly : but earwigs (For- 

 ficula\ their size considered, are furnished with very 

 ample and curious wings, the principal nervures of 

 which are so many radii, diverging from a common 

 point near the anterior margin. Between these are 

 others which, proceeding from the opposite margin, 

 terminate in the middle of the wing a . These organs, 

 when at rest, are more than once folded both trans- 

 versely and longitudinally. 



Wings equally ample, forming the quadrant of a cir- 

 cle, and with five or six nervures diverging from their 

 base, distinguish the strepsipterous tribe. When unem- 

 ployed, these are folded longitudinally b . 



Probably in the next order (Orthoptera), the Teg- 

 mina, or wing-covers since they are usually of a much 

 thinner substance than elytra assist them in flying. 

 They are however quite covered by irregular reticula- 

 tions, produced by various nervures sent forth by the 

 longitudinal ones, and running in all directions. When 

 at rest, the inner part of one laps over that of the other : 

 but in different genera there is a singular variation in 

 this circumstance. Thus in Blatta, Phasma, and male 

 Acridce, and generally speaking, but not invariably, in 

 Locusta and Truxalis, the left elytrum laps over the 



PLATE X. FIG. 5. b PLATE II. FIG. 1. It has been 



ascertained that the spurious elytra of these insects are serviceable 

 in their flight. As M. Latreille now allows this, he ought to have 

 restored its original name, which he had altered, to this order. 



c PLATE X. FIG. 2. 



