320 NEW YORK STATE MUSEUM 
fig.17]; the anterior tergal setae of the mesothorax and meta- 
thorax divided into three groups, those of the first six abdominal 
segments continuous and connected with the supraspiracular 
setae, those of the seventh segment continuous, but with their - 
lateral extensions widely separated from the supraspiracular 
setae, the posterior tergal setae of the mesothorax distinct from 
all the other groups, those of the metathorax with their outer 
ends curving cephalad and slightly coalescing with the anterior 
tergal setae, those of the first five abdominal segments continu- 
ous and straight and of about the same length as the anterior 
tergal setae, those of the sixth abdominal segment only slightly 
separated from the supraspiracular setae, which in this seg- 
ment extends much farther caudad than in the others, those of 
the seventh abdominal segment curved and extending from one 
spiracle to the other; the supraspiracular setae broad, well — 
marked, those of the seventh segment small, consisting of only 
a few setae; the infraspiracular setae of medium size and ob- 
lique, those of the seventh segment behind the spiracle and near 
the apex of the posterior tergal setae; the anterior and posterior 
sternal setae of the thorax distinctly separated and divided lon- 
gitudinally into two groups, the sternal setae of the first five 
abdominal segments square in outline and continuous, those of 
the sixth and seventh segments divided longitudinally into two 
groups; the pedal setae well marked and not joined to the ster- 
nal setae [p1.29, fig.3]. 
Pupa. White; legs, wing pads, and antennae not closely at- 
tached to the body; the second and third segments of the an- 
tennae subequal; the pronotum not with an impressed line nor 
tuberculate on the side in front; the first ventral abdominal 
Segment as long as the next four. Length, 9mm; width, 5mm. 
Cocoon. Brownish; oval in outline; and attached along the 
middle line of the leaf of a sedge. Length, 10mm; width, 5mm. 
Described from numerous specimens loaned by the United 
States National Museum and probably collected by Messrs Hub- 
bard and Schwarz on rushes along the Detroit and St Clair 
rivers in August 1873. 
Donacia porosicollis 
Kgg. 15mm in length; opaque white in color; each end bluntly 
rounded, the sides subparallel, naked, not surrounded by a gel- 
atinous covering; laid in a single row along the edge of the 
leaves of a sedge under water, and attached by one side [pl.21, 
fig.2; pl.24, fig.3, 4]. 
Larva. Mandibles distinctly medially bidentate with well 
marked teeth within [p1.26, fig.1]; eyes present, five in number, 
