13 
ually destructive during the season. But there was no serious in- 
jury to fields in which Paris green was promptly applied to check 
the attack. In gardens near large potato fields some damage 
to tomatoes and egg-plants was done late in the season, after 
the potatoes ripened, by beetles migrating from the fields. 
At Durham some injury to cabbage and related plants was 
done by the Zebra caterpillar,* an insect at once distin- 
guished from other larvae feeding upon cabbage, by the brilliant 
yellow and black markings upon its body. It hatches from small 
spherical eggs, laid in clusters upon the cabbage leaves, by a 
handsome purplish brown moth (Fig. 2) that appears in early 
summer. At first the larvae are very dark, and feed together 
gregariously, but as they develop they become lighter colored 
Fig. 2. The Zebra Caterpillar : a, larva; b, moth. (After Riley.) 
and disperse over the plant. When disturbed they roll up and 
drop to the ground. They become full-grown (a) in three or 
four weeks, when they are about two inches long, with a wide 
longitudinal, velvet black stripe upon the middle of the back, 
and two bright yellow stripes upon each side, which are connected 
by fine yellow transverse lines. The caterpillars now construct, 
slightly beneath the soil surface, loose cocoons composed of 
particles of earth, fastened together by silken threads in which 
*Ceranica picta. 
