FURTHER STUDIES OF THE BIOECOLOGY 
OF THE NEW ENGLAND TINGIDAE 
(HETEROPTERA) 1 
By Norman S. Bailey 
Bradford Junior College 
I. INTRODUCTION 
A. Terrain and Vegetation 
Seasonal population trends for three species of Corythucha were 
followed by regular observations and timed collections made from 
their respective host plants at selected stations on an undeveloped 
tract of land belonging to Bradford Junior College. A rather full 
description of the vegetation and terrain is included here to serve 
as a reference to the general environmental features of these lace bug 
habitats and their surroundings during the period of these studies. 
The seasonal activities of the lace bugs were followed from April 
until October in 1957, 1958, and i960. 
An estimate made from a plan drawn by the city engineer (Haver- 
hill, Massachusetts) indicates that approximately ten acres are in- 
cluded in the study area. Our college residence is located near the 
southwestern corner of this property, making the area exceptionally 
convenient for these studies. The land is generally low and poorly 
drained, despite a series of open ditches that have obviously been 
neglected for years. More than half of the land lies between 130' 
and 135' elevation, with a low point at 125', where two of the ditches 
converge near the east corner of the tract and a high of 144' above 
sea level on the west corner of our house lot. Because of the poor 
drainage, much of the land is swampy and in spring (or later in wet 
seasons) the water table is at, or even above, the ground surface 
wherever the elevation is below 132'. Within these narrow limits, the 
surface is somewhat irregular with a general east-southeast slope 
which determines the direction of the drainage. 
Northeast of the study area a natural boundary, forty to fifty feet 
wide, is provided by a belt of mature trees. Beyond this narrow stand 
lies the open college athletic field. Roughly half of the field is well- 
cared for turf and the southeastern part supports various grasses 
with a scattered assortment of other herbs. This portion is usually 
cut over once or twice annually. The band of trees consists mostly 
Acknowledgment is gratefully made of a Sigma Xi-Resa Research Fund 
Grant and Grant No. G5477 from the National Science Foundation, which 
made this series of studies possible. 
Manuscript received by the editor October 19, 1963. 
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