1964] 
Bailey — Tingidae 
71 
the lace bugs were active into early October. In i960, however, 
emergence was about a week earlier and temperature changes were 
less marked, especially after early July. Although collections were 
attempted through October 2nd, no specimens were taken on Juglans 
A after September nth. That fall the fringe of a hurricane brought 
strong winds and 4^2 inches of rain in a storm that started on the nth 
and lasted until the following evening. The night of the 17th there 
was a light frost. Most of the large butternut leaves were stripped 
off or badly tattered. The severe storm followed so soon by a frosty 
night sent most C. juglandis into hibernation nearly a month earlier 
than in 1958. 
Lace bug numbers on Juglans B have been consistently small as 
Figures III and IV indicate. Somehow the collection for June 8, 
1958 was misplaced or passed over when the data were being tabu- 
lated. This explains the break in the Figure III graphs. The storm and 
frost that drove the insects from Juglans A after September 11, i960 
did not as completely eliminate them from Juglans B which is some- 
what more protected by the surrounding trees. On the basis of the 
few differences noted, it is difficult to understand why the popula- 
tions on these two host plants should vary so much. 
This species emerges from hibernation by early or mid-May, 
depending on host leaf development. By late June or early July the 
first brood is maturing and a second appears by mid-August or early 
September. In favorable seasons they may remain active into early 
October, but such a combination of weather conditions as occurred in 
early September i960 may send most of them into hibernation a 
month earlier. Two annual broods are apparently usual in north- 
eastern Massachusetts. In 1958 the second brood produced the 
greatest population concentration (see Figure I) while in i960 the 
greatest population peak was produced by the emergence of over- 
wintering adults (see Figure II). 
It is also evident (Figures I and II) that males of this species are 
somewhat more numerous than the females at the beginning of the 
season. This was also true in 1957. 
Literature Cited 
N. B. The names of cultivated and native plants mentioned in this paper 
are those used by L. H. Bailey and M. L. Fernald respectively. 
The distribution and biology of Corythuca juglandis (Fitch) is fully re- 
viewed and detailed references are given in my 1951 paper on the Tingoidea 
of New England. 
