248 THE CANADIAN ENTOMOLOGIST. 



A. Tarsi with fourth joint about equal to third, flanks of thorax con- 

 tinuous with disk. Middle coxae moderately distant (except in 

 Hydiiocera). 



b. Tarsi distinctly 5-jointed, first joint not shorter than second ; 

 antennae i i-jointed, serrate; eyes coarsely granulate. Cymaiodera. 

 bb. Tarsi apparently 4-jointed, the first joint small, usually visible 

 only from below. 

 c. Eyes moderate in size and emarginate in front. 



d. Antennas serrate, eyes strongly granulated Priocera. 



dd. Antenna; usually distinctly clavate, eyes finely granulated. 



e. Last joint of maxillary palpi broader than the preceding ; 



thorax and legs blue, shining ; elytra blue or violet 



with red bands or the reverse Trichodes. 



ee. Last joint of maxillary palpi slender. 



Posterior tarsi rather broadly dilated Clerus. 



Posterior tarsi longer and slender Thanashnus. 



cc. Eyes not emarginate, often very large and prominent. 



Antennw stout, club 3-jointed, not abrupt. . . Thatieroderus. 



Antennfe slender, club sub-globose Hydnocera. 



AA. Tarsi with the fourth joint very small, forming merely an enlargement 

 at the base of the fifth ; flanks of prothorax separated from the disk 

 (except in Ichnea) by a more or less distinctly elevated margin. 

 Middle coxae contiguous or slightly separate. 

 f. Antennae with outer joints flattened, and triangular or inwardly 

 prolonged, 

 g. Eyes with an internal emargination. 



Club of antenna; 3-jointed, not longer than the other 



portion Phyllobcewis. 



Club 3-jointed, each joint as long as basal portion. . .IcJmea. 

 gg. Eyes with a frontal emargination. 



First joint of tarsus equal to second, anterior tibiae serrate 



externally '. Chariessa. 



First joint of tarsus small, inferior ; eyes coarsely 



gi'anulate Orthopleura. 



ff Antennae with a small compact club. 



Smaller ; above reddish to blackish Laricohius. 



Larger ; above bright blue, with or without reddish 



markings Necrobia. 



