468 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
throughout the northern, middle and coast districts of New Jersey and 
occasionally in the pine barrens where it is introduced. In several 
localities we found plants which were heavily infested by the insects, 
but hardly any noticeable injury was observed. In a few cases, a 
slight discoloration of the foliage was noted together with some dis¬ 
figuration of the upper leaf surfaces due to the numerous third stage 
nymphs which had collected there. 
Adults appear about the middle of May in the southern part of the 
State and about a week later northward and can be found in diminish¬ 
ing numbers up to about the first week of July. For the vicinity of 
Washington, D. C., McAtee (Ent. News, Vol. XXIX, p. 222) states 
that they are abundant from May 4 to June 29. After copulation, 
egg laying takes place, the foliage on the tips of the twigs usually being 
selected for this purpose. 
The eggs are light, lemon yellow when first laid and later become 
brownish or brownish black. They are fastened singly to the leaf 
by means of a short peduncle which is inserted in the tissue. The 
edges of young leaves are favorite places for egg deposition, from two 
to forty eggs being found on a single small leaflet. The edge of the 
winged blade of the stem of the compound leaf is also a favorite place 
for the eggs and in some instances, eggs were found on the upper and 
lower leaf surfaces, usually close to or on the midrib. The incubation 
period is from two to three weeks, the first stage nymphs appearing 
about the middle or last part of June. The insect passes through four 
nymphal stages, each one of the first three requiring about a month 
to mature. 
By the middle and last week of September practically all of the 
nymphs are in the third and fourth stages and have sought hibernation 
quarters on the woody stems. The first two nymphal stages can be 
found as a rule on the under sides of the leaflets and blades of the stem, 
many of them feeding with their heads close to the midribs. 
After reaching the third stage they appear to migrate to the upper 
sides of the leaves and especially the upper sides of the blade-like ex¬ 
tensions of the stem, where they rest with their heads close to the stem. 
Most of the fourth stage nymphs and many of the third stage are found 
on the hairy twigs of the plant, close to the lenticels or crowded as far 
as possible under the buds in which places they hibernate during the 
winter. This method of hibernation was noted by Schwarz. 
Individuals of the first two nymphal stages are very flat and light 
yellowish in color. Those of the third and fourth stages are convex, 
dark in color and covered with globular tubercles of varying sizes ar¬ 
ranged in a symmetrical pattern. The color of the last two stages re¬ 
sembles closely the bark of the twigs on which they hibernate. All 
