TREE-HOPPERS. sig tl 
rather general feeders and are—in the adult stage—too active 
and quick of flight. But it is possible and equally necessary 
to have orchards and nurseries in such a clean condition that no 
foreign vegetation can be found, which will of course starve out 
the intruders. But the best and only certain remedy besides 
cleanliness is in autumn or winter to cut off all twigs showing 
the presence of such eggs. The larve can also be greatly re- 
duced in numbers by repeated applications of kerosene and soap 
emulsion, or by the use of strong tobacco extracts. 
Fic. 101a.—a, twig showing rows of Fic. 102.—Thelia crategi Fitch. Front 
egg slits, natural size; b, one egg slit and side view. Original. 
enlarged, showing egg; c, larva; d, 
nymph—last two enlarged. After 
Riley. Div. of Entomology, Dep. of 
Agriculture. i 
Thelia crategi Fitch. (The Thorn-bush Tree-hopper). 
This insect has habits similar to those of the Buffalo Tree- 
hopper and during July and August is quite common on apple 
trees and the thorn bushes, where it may be seen resting upon 
the small limbs, sucking the sap. But it is a wide awake insect 
which upon approach is apt to leap away with a sudden spring 
and is then lost to view. 
As the illustration Fig. 102 shows, it is a very peculiar look- 
ing object, with a three-sided body, black, varied with chestnut 
brown, with a large white spot on each side, which, extending 
forwards, forms a band across the front. Another white band 
extends across the hind part of the back; the protuberance on 
the front part of the body is large and peculiar, giving to the 
