THE CANADIAN ENTOMOLOGIST. 233 



e. Inner spur of ^ hind tibiae arcuate and angularly- 

 bent at tip, somewhat sigmoid in form (see fig. 



26) gibbosa, Burm. 



ee. Inner spur of ^ hind tibiae at most slightly curved, 

 f. Antennae 9-jointed. ' 



g. Sutural stria well impressed, the costa of 

 normal convexity. 



Form oblong-oval, last ventral of $ 

 convex, sometimes with a median 



channel implicita, Horn. 



Form elongate, last ventral of $ broadly 

 concave with longitudinal median 

 impression villifrons, Lee. 



gg. Sutural stria indistinct, costa scarcely 



elevated. limiila, Horn. 



ff. Antennae lo-jointed. 



h. Clypeus moderately closely punctate 



only, the sides of the thorax entire, 



disk never very coarsely punctate. 



Ventral ridge of $ long, arcuate, 



overhanging for its full length 



behind dubia, Smith. 



Ventral ridge of $ longer, slightly 

 curved, the ends only overhang- 

 ing behind fj{sca, Froh. 



Ventral ridge of $ nearly straight, 



not overhanging behind...... 



, ..grandis, Smith. 



hh. Clypeus densely punctate. 



i. Thorax broadest at base, margin 

 entire or slightly crenate, disk 

 variably punctured. 



Last ventral of $ vaguely 

 longitudinally impressed 



Tnarginalis, Lee. 



Last ventral of ,$ with cupuli- 

 form fovea, ./raterna, Harr. 



