234 



THE SCIENCE OF LIFE. 



Order 2. Orthoptera ; (prthos, straight; pteron, wing,) 

 embraces the Crickets, (Achetina^) Grasshoppers, (Gryl- 

 lina,) (Fig. 138,) Locusts, (Locustina,) and Cockroaches, 



FIG. 138. i. Dragon-fly, (Libellulina dejressa.) 2. Grasshopper, (Gryllus.) 3. Bee, 

 (Afzs mellijica.) 4. Fly, (Musca domestica.) 5. Butterfly, (Pontia brassica.) 6. Musk- 

 beetle, {Cerambyx moschatus.) 



(Blattina.} . Mouth masticatory. Wings four, or want- 

 ing ; anterior pair small, thickened, and overlapping 

 along the back ; the hinder pair broad, net-veined, and 

 folding like a fan. Legs various, being powerful jump- 

 ing organs in grasshoppers, raptorial (raptor, a plun- 

 derer) in Mantis ; cursorial (ciirro, to run) in Locusts. 

 Each family produces sounds which are characteristic, 

 and which are supposed to be produced by the rapid 

 friction of the long hind legs against the wing. The 

 sound of the Grasshopper is said to be the highest 

 known musical note. 



