THE CANADIAN ENTOMOLOGIST. 169 



Third antennal joint about as long as joints 4-5 united, or nearly 

 thrice as long as the pedicel or second joint ; abdomen shining, 

 but minutely or microscopically punctate, the punctures of 



first segment a little larger Pseudocrabro, Ashm., n. g. 



[Type C. chrysarginus, Lepel.] 

 Third antennal joint much shorter than joints 4-5 united. 



Abdomen, or at least the basal segment, highly polished, 

 impunctate, or at most sparsely microscopically punctate ; 

 pygidial area much narrowed, deeply excavate and fully 

 twice as long as wide at base ; first joint of flagelluni 

 twice as long as the pedicel . . , .Xestocrabro, Ashm., n. g. 



[Type C. 6-maculatus, Say.] 



Abdomen distinctly, minutely (somewhat sparsely) punctate ] 



pygidial area more nearly triangular, and not twice as 



long as wide at base ; first joint of flagellum only a little 



longer than the pedicel Xylocrabro, Ashm., n. g. 



[Type C. stirpicola, Pack.] 



7. Ocelli in an obtuse triangle . * ., the lateral ocelli being about twice 



as wide from each other as to the front ocellus, or nearly ; third 

 antennal joint not especially long; thorax sculptured as in Solenius; 

 abdomen smooth, impunctate or at most feebly microscopically 



punctate Metacrabro, Ashm., n. g. 



[Type C. Kollari, Dahlb.] 

 Ocelli in an equilateral triangle _ " , or nearly, the lateral ocelli being 

 not or very little farther from each other than to the front ocellus ; 

 superorbital foveas wanting, never sharply defined, at most represented 

 by a slight glabrous streak near the eye margin ; thorax finely 

 closely punctate, opaque, the meso- and metapleura striated ; 

 abdomen smooth, impunctate or at most microscopically coriace- 

 ously sculptured; third antennal joint elongate, as long or longer 



than joints 4-5 united Clytochrysus, Morawitz. 



[Type C. sexcinctus, H. Schf] 



8. Mandibles with a tooth within near the middle or towards the base. 



Superorbital foveje very distinct, sharply defined, elongate or linear, 

 dull at bottom g, 



Superorbital fovete wanting or at most indicated only by a slight, 

 scarcely perceptible glabrous depression or streak ; third antennal 

 joint long, about as long as joints 4-5 united or a little longer; 



