3° 



TETTIGID.E OF NORTH AMERICA 



dinarily modified in front, and is separated from the meta- 

 sternum by a convexed and rather deep furrow, the convexity 

 being directed forward. 



The small squamous elytra are more or less oval, cov- 

 ering a small portion of the base of the wings; the wings are 

 not infrequently well developed, extending to the posterior 

 extremity of the pronotum or beyond it. The anterior 



Sen 



Fig. 8. Hind wing of Paratettix cucullatus. More reduced figure below. 

 Tracheseoccupy the veins represented by solid lines of anal area. 

 The basal origin of the trachea; designated at the left. 



border, being the exposed portion when folded up at the 

 sides, is chitinous in the apical half and more or less opaque. 

 In recent specimens, which have just undergone the last exuvi- 



FiG. 9. Hind wing of Tettigidea parvipennis pentiata. The media shown 

 at M is free at the distal portion and divided into three sub- 

 branches. Original. 



ation, it is quite hyaline, and it is at this stage the tracheation 

 can best be observed. The anal field is traversed by many 

 transverse nervules, which form square and rectangular spaces. 

 The narrowing of the wing proper, the part before the 

 anal furrow, has had the effect of bringing together the veins. 



