50 



NATURAL HISTORY OF INSECTS. 



and are more or less concealed beneath the anterior pair. 

 In a few species one or more pair of wings are wanting. 

 The mouth-parts are fitted for biting. The transformations 



Fig. 142. 



are incomplete, the pupa being active. With the exception 

 of those belonging to the same family as the Mantis (Fig. 

 142), all the insects of this Order are more or less injurious. 



Fig. 143. 



In the Earwig family (Fig. 41) the anterior wings meet in a 

 Straight line on the back, as in the Rove-beetles (Fig. 249), 



