AN INTRODUCTION TO ZOOLOGY. 



ferences. The Mole-cricket, GryUotalpa vulgaris, is 

 so called because it digs subterranean passages to its 



4 I I 



Fig. 68. — Mole-cricket {Gryllotalpa vulgaris) and Nest, 



nest. This and the other Gryllidce destroy roots and 

 do much mischief. 



Fig. 69.— House-cricket (Grj/ilus domesticvs). 



A sub-order is called Pseudo-neuroptera, because 



