314 NEW YORK STATE MUSEUM 



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 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 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 wanting Haemonia 



Pupa 



Tarsal segments expanded at either side; the elytra usually truncate at 



apex 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 Donacia 



Tarsi not dilated, narrow, glabrous; the fifth segment of the tarsi dis- 

 tinctly longer than the second and third together Haemonia 



DOXACIA 



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: 



Eggs 



a Eggs large, 5mm long cincticornis 



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 leaf palmata 



66 Eggs not covered with a gelatinous secretion, and laid in a single row 

 along the margin of a sedge leaf 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 baud of 

 setae 



