370 Report of the Department of Entomology of the 



covers or elytra which are held motionless during flight as are the 

 front " wings " of grasshoppers. The true wings are smaller, are 

 used for propelling the insect and are folded under the elytra when 



at rest. The wing covers rest in the posi- 

 tion shown in Fig. 6, covering the insect's 

 body like a- roof. 



The adults are more conspicuous than 

 the nymphs and are especially noticeable 



Fig. 6 — Mature Grape 



Leaf-Hopper. 



(Enlarged.) 



Fig. 8 — Fifth Ntmphal In 

 stab of Grape Leaf- 

 Hopper. 

 (Enlarged.) 



3 4 



Fig. 7 — First Four Nymphal Instars of 



Grape Leaf-Hopper. 



(Enlarged.) 



at the time the grapes are being harvested. 

 They are then very annoying because they 

 get into the mouths, ears and noses of the 

 pickers. At this time they fly about, 

 e; pecially on warm and calm days during 

 the latter part of the season and drift to 

 other vines, or to grass fields, brush land 

 and thickets. In fact, they seek any place 

 that will shelter them during the winter, 

 although many of the insects remain 



many 

 among the fallen leaves in the vineyards. 



The adults are about one-eiglitli of an inch in length and during 

 the summer they appear light yellow in color, but they grow 



