286 



INSECTS INJURIOUS TO THE GRAPE 



cells is shown with the fly resting on it; also one of th^ 

 chrysalids. 



Occasionally this insect is very destructive, sometimes en- 

 tirely stripping the vines. In such cases the foliage should 

 be sprinkled with hellebore and water, or Paris-green and 

 water, in the proportions given under No. 140. 



No. 157. — The Grape-vine Leaf-hopper. 



Erythroneura vitis (Harris). 



The accompanying figure, 297, represents the insect com- 

 monly known among vine-growers as the " Thrip.^^ The 



insects are shown 

 Fig. 297. . 



magniiied; the 



shorter lines adjoin- 

 ing indicate their 

 natural size. The 

 figure to the left 

 shows the mature in- 

 sect wath its wings 

 expanded, the other 

 the same with its wings closed. It is rather more than one- 

 eighth of an inch long, crossed by two broad, blood-red bands, 

 and a third dusky one at the apex, the anterior band occu- 

 pying the base of the thorax and the base of the wing-covers, 

 the middle one wide above, narrowing towards the margin. 

 Besides vitis, there are half a dozen or more which are sup- 

 posed to be distinct species, all about the same size, and w^ith 

 the same habits, differing only in the markings on the wings. 

 These insects pass the winter in the perfect state, hiber- 

 nating under dead leaves or other rubbish, the survivors be- 

 coming active in spring, when they deposit their eggs on the 

 young leaves of the vine. The larvae are hatched during the 

 month of June, and resemble the perfect insect except in 

 size and in being destitute of wings. During their growth 

 they shed their skins, which are nearly white, several times, 

 and, although exceedingly delicate and gossamer-like, the 



