68 
Psyche 
[December 
The Maine records cited establish the frequent occurrence of this 
species in the central coastal region and in other parts of that state. 
Another locality is added to the few published New Hampshire rec- 
ords. Rhode Island and Connecticut stations are given for the first 
time. 
Of particular interest is the fact that the specimens from the two 
southernmost New England states suggest that typical Corythucha 
pruni O. and D. and typical C. associata O. and D. may represent 
extreme forms which have differentiated in the recent past from a 
common population. I he latter has not yet been collected in Mas- 
sachusetts nor further north. Until now, C. pruni had not been re- 
ported from southern New England. Both species restrict their feed- 
ing entirely to Prumis serotina Ehrhart. The collections noted above 
were all from this host. Two collections made in Connecticut in 
I95 1 aroused my curiosity. In both, specimens of the two species 
were found on the same host plants. On recent critical examination 
of this material, I found that the Brookfield collections consisted of 
26 specimens. Three of these were, on basis of hood size and form, 
definitely C. pruni (2 males and a female), 22 were C. associata, and 
one was questionably C. associata because the top of the hood was 
missing. Among the associata forms there was some variation in the 
height and width of the hood. The Monroe collection made the 
same day consisted of 38 that were surely C. pruni and a single 
female of C. associata. More recently a collection from Mattatuck 
produced 9 males of C. pruni and one female of C. associata. In 
Shelton one C. pruni male was found on a Prun.us and another host 
plant in that town yielded 100 adults of C. associata. 
Close study of these two species in Connecticut should answer some 
important questions. Except for the marked differences in their hood 
forms and, more significantly, the claspers of the males, they are very 
similar. In size and coloration they are almost identical. Frequent 
collections in several localities in this contact zone throughout one or 
two seasons would give valuable population information and speci- 
mens for careful comparison of structural details. 
As previously mentioned, a similar situation involving the species 
C. bellula Gibson and C. coryli O. and D. whose primary host is 
Cory lus may exist from central Maine and New Hampshire west- 
ward. Again we find two species of similar size with minor mor- 
phological distinctions. Similarly intriguing is the relationship be- 
tween our two New England species whose host is commonly Alnus. 
Here, however, there are greater differences in size in addition to the 
