ARTICULATA. 285 
of wood; the Horned Corydalis (Corydalus), of which 
the male has formidable mandibles twice as long as the 
head; and the White Ants (Zermes) of the tropics. 
2. Orthopters have four wings: the front pair some- 
what thickened, narrow, and overlapping along the back ; 
the hind pair broad, net-veined, and folding up like a fan 
upon the abdomen. The hind legs are usually large, and 
fitted for leaping, all the species being terrestrial, although 
some fly as well as leap. The eyes are small, the mouth 
Fig. 256.—Metamorphosis of a Cricket (Gryllus). 
remarkably developed for cutting and grinding. The lar- 
vee and pupee are active, and resemble the imago. They 
are all vegetarian. Each family produces characteristic 
sounds (stridulation). The representative forms are Crick- 
ets (Gryllus), Locusts (Locusta), Grasshoppers (Acrydium), 
Walking-sticks (Phasma), and Cockroaches (Llatta). 
3. Hemipters, or “ Bugs,” are chiefly characterized by 
a suctorial mouth, which is produced into a long, hard 
