8 THE CANADIAN ENTOMOLOGIST. 



A. Anterior coxal cavities open behind, 

 b. Claws simple or bifid. 



c. Tibite without terminal spurs ; epipleura of elytra extend- 

 ing nearly to apices. 

 d. Antennte longer than one half the body ; claws deeply bifid. 

 Third antennal joint shorter than fourth ; large 



species Trirhabda. 



Third joint longer than fourth ; small 



species Galerucella. 



dd. Antennae less than half as long as body ; claws simple or 

 narrowly bifid Monoxia. 



cc. Tibiae (middle and posterior) with terminal spurs, outer edge 

 more or less carinate Diabrotica. 



bb. Claws appendiculate {i. <?, with broad dilatation at base). 



Epipleura not distinct, tibias without spurs Phyllobrotica. 



Epipleura distinct, all the tibia? with spurs Liiperodes. 



AA. Anterior coxal cavities closed behind. 



Large species, tarsal claws bifid, tibiae without spurs . . . Galeruca. 

 Smaller species, claws appendiculate, tibiae with spurs . . Cerotoma. 



I have omitted Scelolyperus from the above table, although the 

 Southern Californian 6'. tnacuiicollis, Lee, is in the Society list. The 

 genus belongs in the group with open anterior coxal cavities, appen- 

 diculate claws and well-defined epipleura. In the scheme it would 

 precede Liiperodes, from which it differs in having no tibial spurs. The 

 species above mentioned is about one-fourth of an inch in length, head 

 and under surface blacic, thorax either yellow with three dark spots or 

 entirely black, elytra bluish or greenish. Antennae two-thirds as long as 

 the body, piceous, with three basal joints pale beneath. 



Trirhabda, Lee. 



Large insects, of rather elongate-oblong form, usually of somewhat 

 opaque surface, the thorax in most cases spotted, the elytra bluish, 

 greenish, or brownish, with yellowish stripes. They are to be taken 

 during the summer months by sweeping rank herbage in lanes and 

 meadows, and may often be taken in numbers on the golden-rod. Dr. 

 Horn has thus separated our species : 

 A. Surface of body without any trace of metallic lustre in the markings, 

 these being opaque or brownish. 



