290 INSECTS INJURIOUS TO THE GRAPE. 



Tree-bugs. 



There are also several species of tree-bugs which infest the 

 vine and suck its juices. 



No. 161. The large green Tree-bug, Rhaphig aster Penn- 

 sylvanieus De Geer (Fig. 301), is from six to seven tenths of 

 an inch long, flattened in form, of a grass- 

 FIG. 301. green color, margined with a light-yellow line, 

 which is interrupted at each joint of the abdo- 

 men with a small black spot. The antennae 

 are black, with some yellow on the basal and 

 terminal joints. It occurs on grape-vines, 

 chiefly in September, and is also found on 

 hickory and willow trees. 



No. 162. The Bound Tree-bug, Pentatoma 

 ligata Say, is a large green bug closely resembling the species 

 last described, but is more broadly edged all around, except 

 upon its head, with pale red, and has a pale-red spot upon 

 the middle of its back. The antennae are green, except the 

 three last segments, which are black. This species is a little 

 more than half an inch long, and occurs also on the hazel. 



No. 163. The Modest Tree-bug, Arma modesta Dallas, is 

 smaller, being from four to four and a half tenths of an 

 inch long, of a tawny yellowish-gray color, thickly dotted 

 with brown. The wing-cases are commonly red at their tips, 

 and the under glassy wings have a brown spot at their ex- 

 tremities. The under side is whitish, with a row of black 

 dots along the middle of the abdomen, and another on each 

 side. This insect is one of the commonest tree-bugs, and is 

 found in the autumn on a number of different trees and 

 shrubs. 



No. 164. The Grape-vine Aphis. 



Siphonophora viticola Thomas. 



This species of plant-louse, which is destructive to the 

 leaves and young shoots of the grape-vine, is of a dusky- 



