314 NEW YORK STATE MUSEUM 
KEY TO GENERA OF DONACIINAE 
Larva 
Sixth and seventh abdominal tergites each with a double row of setae of - 
the same length as those found on the other tergites; the supraspiracular 
setae always present......... Hp Faas bi Stiac 208 "a's ‘ol e) ove ote hehe ae Donacia 
Sixth and seventh abdominal tergites each with a double row of setae, 
most of which are twice as long as those found on the other tergites; 
the supraspiracular setae “WantMNe. ....:.. 226 2s eee eee Haemonia 
Pupa 
Tarsal segments expanded at either side; the elytra usually truncate at 
IE. |. obs Sate! Sank eis wea hee wie emis alae keke Be Os peer Donacia 
Tarsal segments of a uniform width; the elytra usually excised with the 
outer angle strongly and the inner angle slightly prolonged at apex.... 
Haemonia 
Imago 
Tarsi dilated, spongy beneath; the fifth segment of the tarsi subequal to 
or shorter than the second and third together....«........... Doenpaera 
Tarsi not dilated, narrow, glabrous; the fifth segment of the tarsi dis- 
tinctly longer than the second and third together......... Haemonia 
DONACIA 
The beetles of this genus are known as the long-horned leaf 
beetles because of their great resemblance to the species of the 
family Cerambycidae. ‘They are elongate in form and of a green- 
ish, bronze or purplish metallic color. The antennae are long 
and slender; the underside of the body is clothed with fine hair, 
giving them a silvery metallic appearance. 
Species of Donacia are found in all parts of the United States 
and Canada, but they are more abundant in the northern, east- 
ern and middle portions. Twenty species have been recognized 
which can be separated, so far as they are known, by means of 
the following tables: 
a Degs: large; om done 6 eG oe ee ts ee eee ee cinctie®@erirs 
aa Eggs small, not over 2mm long 
b Eggs covered with a gelatinous secretion, laid in a double row around 
a circular: opening in’ a) leat. 4 1. re bikie vee eee palmata 
bb Eggs not covered with a gelatinous secretion, and laid in a single row 
along the margin of a sedge lgaf..............05: porosicollis 
Larva 
a Supraspiracular setae of the first four abdominal segments not extend- 
ing caudad as far as the front margin of the posterior tergal band of 
setae 1 
