292 



INSECTS INJURIOUS TO THE GRAPE. 



of a dark slate-color, about oue-eiglitli of an inch long, and 

 not more than one-tliird of this in diameter. They are laid 

 in two contio^uous rows alono- a twig or cane, tiie bark of 

 which is previously shaved off or made rough with the piercer. 

 The rows are placed somewhat obliquely, overlapping each 

 other a little, and are firmly fastened with a gummy substance. 

 These singular-looking rows of eggs are frequently found on 

 the canes of grape-vines, and always excite curiosity and in- 

 quiry, and for that reason they are referred to ; they do no 

 particular injury to the vine. The young katydids when 

 hatched, which usually occurs in the following spring, eat 

 almost any tender succulent leaves, and have never been 

 recorded as injurious. 



Another and a very similar species is the Oblong-wingeil 

 Katydid, Phi/Uoptera ohlongifolia De Geer, which is also said 

 to deposit eggs in a similar manner on grape-twigs. 



Fig. 303. 



No. 166.— The Trumpet Grape-gall. 



Vitis viticola Osten Sacken. 



These are curious, elongated, conical galls, about one-third 



of an inch long, of 

 a reddish or red- 

 dish-crimson color, 

 sometimes inclin- 

 T^J^^^ ing to green , grow- 



ing in considerable 

 numbers on the 



< ^ . ^— s 



^^ leaves of the vine. 



(See Fig. 303.) 

 Though usually 

 found only on the 

 upper surface, they 

 are occasionally 

 seen on the under 

 side also. They are 

 produced by a gall-gnat, an undetermined species of Cecido- 



