AQUATIC INSECTS IN NEW YORK STATE O20 
as the next four; the elytra usually with the outer angle strongly 
and the inner angle slightly prolonged at apex; the tarsal seg- 
ments of a uniform width. Length, 7mm; width, 4mm. 
Cocoon. Light brownish, oval in outline, and attached to the 
side of the small roots of an aquatic plant!; the cocoons broader 
than the roots.. Length, 6mm; width, 8mm. 
Described from specimens collected at Ithaca N. Y. by the 
writer and by Messrs Hubbard and Schwarz along the Detroit 
and St Clair rivers, Detroit Mich. 
Subfamily GALERUCINAE 
This subfamily includes several genera and species, a ‘single one 
of which is found on the leavesof Nymphaea advena. 
The larvae feed on the epidermis of the leaves, and where this 
plant occurs they are quite abundant. 
Galerucella nymphaeae 
Egg. Oblong or short cylindric with smoothly, obtusely 
rounded ends; yellow, shining. The egg cluster consists of a 
small number (6 to 20) eggs placed closely side by side on end 
on the upper surface of a floating leaf of Nymphaea or Brasenia. 
Larva. Head black; the antennae mere tubercles, three 
jointed; the labrum three sided, the distal and lateral margins 
in the form of a continuous convex curve constituting one side, 
the remaining sides formed by the proximal end of the labrum 
with an angle on the median line, the distal margin with a row 
of comb-like bristles attached to the ental surface, two long 
discal and two long lateral setae, the two groups forming a 
transverse line, and four marginal setae [p1.27, fig.9]; the man- 
dibles tridentate, the two inner teeth subequal, the outer one 
much shorter [p1.27, fig.8]; the thorax and abdomen black above 
except at the sutures and with fine whitish fuscous lines divid- 
ing the black into distinct areas—there is such a line on the 
meson of the notum of the three thoracic segments, and a line 
on each abdominal segment dividing it into two parallel trans- 
verse bands, the posterior being the longer, at the end of each 
of these bands a quadrangular spot, and laterad of each an- 
terior spot another subequal in size which bears the spiracle, 
and laterad of the spiracle a much larger spot as long as the 
a ~~ 
1The European species are found on the roots of Potamogeton 
natans, and LeConte and Horn record the American species from 
Potamogeton; but by an oversight I neglected to record the name of the 
plant on which I found them, 
