LOOPERS, OR MEASURING WORMS 179 
moves with a looping gait. On 
each side of its body is a row of 
dark dots or rings. Hibernation 
takes place as a half-grown cater- 
pillar. There are three broods 
annually. The pest may be 
checked by the use of arsenicals, 
preferably Paris green and lime, 
which can be washed from the 
leaves when the stalks are ready Fre. 209.—Adult of the Celery Looper. 
Original. 
to use. 
The Northern Grass Worm (Drasteria erechtea Cramer) 
Clover and grasses sometimes are damaged by a fairly large ‘ meas- 
uring worm,” which eats the leaves. When full grown the worm is 
+ inches long, striped with 
gray and brown, and has 
the habit of moving with a 
Fic. 210.— The Northern Grass Fig. 211.— Adult of the Northern Grass 
Worm. Original. Worm. Original. 
looping gait. It transforms in a nest made by drawing leaves to- 
gether with silk. There are several generations in the course of a 
summer. The best means of control in periods of excessive abun- 
dance is fall plowing. 
The Hop Snout-moth (Hypena humuli Harr.) 
The foliage of hops is attacked by green caterpillars an inch long 
when full grown. The body is dotted with black, there is a dark stripe 
