SQUASH-BUG FAMILY. 81 
oil upon the bugs upon sidewalks or other places is also a good 
way of reducing their numbers; of course the oil should in no 
case be thrown upon the trunks of trees for that would be apt 
to kill them. In fact the bugs should be killed whenever and 
wherever seen, since otherwise they will increase still more, and 
to the great injury of the box elder. 
The illustration on Plate II shows this insect in its different 
stages; the adult, shown both enlarged and in natural size, is a 
bright-colored insect. All the parts shown black in the illustra- 
tion are of that color in the insect, while the light colored parts 
are a bright red. In other words this bright color forms three 
broad lines over the black thorax, whence the latin name ¢trivit- 
Fic. 72.—Corizus hyalinus Fic. 73.—Harmostes. retlex- Fic. 74.—Alydus 5- 
Fab. After Riley. Div. of ulus Stal. Enlarged and spinosus Say. After 
Entomology, Dep. of Ag- naturalsize. After Glover. Glover. 
riculture. 
tatus, or three-banded. The harder parts of the wings are edged 
with red, and all the veins are of the same but more dingy color. 
The earlier stages of this insect are distinguished by the same 
color, which, being even brighter red than in the adult insect, 
enables us to readily detect it. 
The sub-family Rhopalina contains a number of very com- 
mon bugs, two of which are shown. They are of little economic 
importance, although Corizus hyalinus Fab. (Fig. 72) 1s known 
as an enemy to the cottony cushion-scale; it is similar to our 
C. lateralis Say. Related species: as Harmostes reflexulus Stal. 
(Fig. 73) are also common. The latter belongs to another divis- 
ion of the Coreidz, but is closely allied to the one under discussion. 
