292 



INSECTS INJURIOUS TO THE GRAPE. 



thrust into crevices and soft substances. The eggs are of 

 a dark slate color, very flat, pointed at both ends and the 

 edges bevelled : they are about one-eighth of an inch long, 

 and not more than one-third of this in diameter. When in 

 confinement this katydid is said to insert its eggs freely into 

 pieces of cork and other soft substances. The young katy- 

 dids when hatched, which usually occurs in the following 

 spring, eat almost any tender succulent leaves, and have never 

 been recorded as very injurious. The males are furnished 

 with a pair of musical organs, which they use vigorously as 

 night approaches, and their sharp, shrill notes can be heard 

 at a long distance. 



Another and a very similar species is the Oblong-winged 

 Katydid, Phylloptera oblongifolia De Geer, which is also said 

 to deposit eggs on grape-twigs. 



No. 166. The Trumpet Grape-gall. 



Vitis viticola Osten Sacken. 



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



FIG. 303. of an inch lon g> of 



a reddish or red- 

 dish-crimson color, 

 sometimes inclin- 

 ing to green, grow- 

 ing in considerable 

 numbers on the 

 i 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 Ceddo- 



