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VOL. XVII. DECEMBER, 1910. No. 6 


THE AQUATIC CATERPILLARS OF LAKE 
QUINSIGAMOND. 
By Wm. T. M. Fores. 
Worcester, Mass. 
Lake Quinsigamond is situated in the center of Massachusetts, 
on the boundary between Worcester, Shrewsbury, and Grafton. 
It is long, resembling a river, with a number of shallow inlets, 
especially along the east shore. The main part of the lake is 
clear of vegetation, and most of the inlets have been disturbed 
by man, but beyond the “Stringer Dam,” which cuts off the 
southeast corner, and in Flint’s Pond, which is in all but name 
the south end of the lake, the water is mostly only three or four 
feet deep, and overgrown with the water lilies, Nymphza and 
Castalia, Floating Shield, Floating Heart, Pond-weeds, Bladder- 
worts, Pickerel weed, Elodea, and many other plants. This part 
swarms with Nymphule, of the following species: 
N. maculalis, common especially over waterlilies, but flying freely and often 
found even on shore; also ab. masculinalis. 
N. seminealis, equally common where Limnanthemum (Floating Heart) is dom- 
inant. 
N. obscuralis. A single specimen. 
N. allionealis, rather rare, and found only at a single spot, on the north shore 
of ““Cuba”’ Island. 
N. badiusalis, earlier than the preceding, except perhaps the last, and found 
mostly nearer shore; not very common. 
N. gyralis, common, especially in Flint’s Pond. 
N. icciusalis, quite common. 
‘Pyrausta nelumbialis, not commoni. Jx' " 
Larve were found of four species; maculalis and seminealis in 
large numbers, two of gyralis (?); and one of icciusalis. 
Generic characters of the caterpillar. N.(Nympheella) maculalis 
may be taken as a type, but obscuralis and gyralis (?) were com- 
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