240 HANDBOOK OF INVERTEBRATE ZOOLOGY. 



the second whig with a pair of forceps and extend it with 

 a gentle pull outwards and forwards. It is then seen to' 

 be a thin parchment-like membrane, with a stiff anterior 

 edge, which is nearly straight, while the rounded outer 

 and posterior margins are thin and flexible. When the 

 wing is fully extended its upper surface is convex, and 

 its anterior margin is rendered still more rigid by being 

 overlapped by the internal margin of the wing-cover. 



The numerous radiating veins are 

 so arranged that their elasticity causes 

 the wing to fold upon itself like a 

 fan as soon as its margin is released. 



FIG. 129. Front view of head of grass- 

 hopper (Acridium Americanum). (Drawn 

 from nature by W. K. Brooks.) 



o. Antenme. 6. Ocelli, c. Eyes, d, d, d. The 



.,_^.._ = _. frontal portion of the epicranium. e. Clypeus. 



' in / Suture across the clypeus. y, y. Labmm. 

 h. Suture across labrum. /. Gena. k. Tips of 

 maxillae. I. Tips of ligulue. m. Maxillary 

 palpus, n. Labial palpus, o. Mandibles. 



5. The Legs. Remove and examine the large leaping- 

 leg of the side from which the wing-cover was taken. It 

 consists of five regions : 



a. The coxa, or basal division (Figs. 130, 8, and 

 132, cZ, cZ', cZ"), which is joined to the thorax. 



b. A small division, the trochanter (Fig. 132, e, e', e"), 

 immovably joined to the distal dorsal portion of the 

 coxa. 



In this species the trochanter is quite small and imper- 

 fectly separated from the coxa. In most other insects it 

 is more conspicuous, and it should be examined in a man- 

 tis, or in a beetle, for comparison with the grasshopper. 



