Se NEW YORK STATE MUSEUM 
with eight marginal setae, the six median setae equidistant from 
each other and subequal in size, the outer ones more distant 
and longer, with six discal setae, the distal and median pairs 
almost in a line and subequal in length, the proximal pair long . 
and slender, with two lateral setae placed near to the proximal 
margin of the labrum, and with four sensory pits [pl.26, fig.11]; 
the anterior tergal setae of the mesothorax and metathorax 
divided into three groups, those of the first seven abdominal 
segments continuous but slightly broader at the middle of ab- 
dominal segments two, three and four, the posterior tergal setae 
continuous, those of the seventh abdominal segment extending 
as far as the spiracle; the supraspiracular setae of the first six 
abdominal segments divided transversely, the cephalic group 
being joined to the outer ends of the anterior tergal setae and 
the caudal group triangular in outline and midway between the 
anterior and posterior tergal setae; the infraspiracular setae 
almost as broad as the segment, oblique; the anterior and pos- 
terior sternal setae distinct, the posterior sternal setae of the 
thorax divided longitudinally, the sternal setae of the first six 
abdominal segments distinct and not divided longitudinally, the 
sternal setae of the seventh abdominal segment small and di- 
vided longitudinally into two groups, the lateral margins of the 
sternal setae of the first two atdominal segments slightly co- 
alesced with tthe pedal setae; the pedal setae broad and well 
marked [p1.30, fig.1]. 
Pupa. White; the legs, wing pads, and antennae not closely 
attached to the body; the second and third segments of the 
antennae subequal; pronotum with a well marked median line- 
like grove and a prominent tubercle on each side in front; the 
first ventral abdominal segment as long as the next four. 
Length, 8mm; width, 3mm. 
Cocoon. Dark brownish, oval in outline, attached to the side 
of the roots of Sagittaria and much wider than the roots to 
which they are attached. Length, 8mm; width, 4mm. 
Described from specimens collected on the roots of Sa git- 
taria latifolia and Sagittaria rigida atapaaee 
(es 
Donacia emarginata 
Larva. The mandibles with two median teeth and well marked 
denticulations within, the surface with two or three setae [pl.26, 
fig.18]; the eyes apparently wanting; the three segments of the 
legs with numerous setae [pl.26, fig.16]; the labrum four sided, 
with eight marginal setae, the six median setae adjacent, sub- 
equal in size, and at the bottom of a slight emargination, the 
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