1893.] Entomology. 753 
would involve periodical outbreaks. I believe with Professor Fernald 
that the extermination of the pest is possible, “ provided the work be 
continued for several years with mithat, appropriations to keep the 
entire territory under careful supervision. 
Through the kindness of the Committee the NATURALIST is able to 
present the accompenying colored plate showing the various stages of 
the Gypsy Moth. The adult females are represented at Figs. 1 and 2; 
the adult males at 3 and 4; the pupa, (slightly magnified) at 5; the 
caterpillars at 6 and 7; the egg cluster at 8, and eggs magnified at 9 
and 10. 
Mr. Forbush has summarized the habits of this caterpillar as follows ; 
“The gypsy moth feeds only when in the larva or caterpillar state. 
The length of larval life varies somewhat according to circumstances, 
but probably averages ten weeks. When the caterpillars are first 
hatched from the eggs they are light in color and covered with whitish 
hairs. In afew hours they assume a dark hue. They usually remain 
on or near the egg cluster until they change in color, and, should the 
weather be cold, they sometimes remain for several days in a semi-torpid 
condition upon the egg clusters. If the temperature is favorable they 
will search for food before they are twenty-four hours old. If a 
leaf be dropped upon a table on which some of the caterpillars have 
been placed, they will all move towards it and climb upon it. During 
the first few weeks of their existence they remain most of the time on 
the leaves, feeding usually on the under side. Their feeding habits are 
so uncertain that no rule can be given which will apply to all individ- 
uals, but as a rule when about half grown they begin to manifest their 
gregarious instincts. At that time and for the rest of their existence as 
caterpillars they spend a large part of the day clustered in sheltered 
situations, and feed principally at night, going up the trees and out on 
the branches after dark, and returning before daybreak. Where they 
are so abundant that the food supply is insufficient, they evince much 
restlessness, and feed in numbers during all hours of the day and night- 
They may be seen hastening to and fro, both up and down the trees. 
Those which have fed sufficiently are at once replaced by hungry new- 
comers, and the destruction of the foliage goes on incessantly. 
“At such times the trunks and lower branches of the trees are covered 
with a moving mass of caterpillars. Hurrying throngs are passing and 
repassing, and nearly every leaf or denuded stem bears up one or more 
of the feeding insects. The rustling caused by their movements and 
the continual dropping of excrements is plainly audible. On tall trees 
the larger caterpillars appear to crawl to the higher limbs, and they 
