a few fine punctures at the intersections of the reticulating lines in 



taeniolatus. 



Body red beneath; basal joint of middle tarsus of male as long as 



that of the hind tarsus taeniolatus 



Body beneath in part pale, the metasternum and coxal plates 

 black; basal joint of middle tarsus of male much shorter than 

 that of the hind tarsus disintegrate 



Prothorax piceous with side margins pale, varying to entirely pale; 



body beneath black; meshes of elytra! reticulation larger and as a rule 



each with one or more fine punctures . lineellus 



16. Lower face of hind tibiae without a series of punctures along the 

 inner margin or at most with only a few punctures near the base or in 

 basal half; accessory discal tibial punctures few or lacking (Infusca- 

 tus and some examples of bicolor are exceptions in that they have a 

 loose series of punctures along the inner margin, they however lack 



the intermediate discal punctures * 



Lower face of hind tibiae with a row of punctures along the inner 

 margin, usually extending from base nearly or quite to apex 33 



17. Elytra coarsely reticulate in both sexes 18 



Elytra finely or minutely reticulate in the male, the females more 

 coarsely so in some species 20 



18. Reddish brown, metasternum and coxal plates blackish austini 



Black, elytra brownish or fuscous 19 



Size small (less than 7 mm.) ; form narrowly oval strigulosus 



Size larger (8 mm. or more) ; form more broadly oval. 



Prosternal claws of male slender and elongate, the posterior one 

 feebly sinuate beneath; elytral sculpture not materially different 

 in the sexes, the female usually a little duller ambiguus 



Prosternal claws of male foliately expanded; elytral reticulation 

 strongly longitudinal basally in the female erythropterus 



20. Meshes of elytral reticulation more or less irregular and unequal, at 

 least baso-medially 21 



Meshes of elytral reticulation very minute, more rounded, and every- 

 where nearly equal ...29 



21. Protarsi of male very widely dilated, basal joint scarcely as wide as 

 the second, the third joint fully twice as wide as the fourth; anterior 

 protarsal claw of male dentate 22 



Protarsi of male less widely to very feebly dilated, basal joint wider 

 than the second; male anterior claw not toothed 23 



22. Tooth of anterior protarsal claw in male nearly median in position; 

 meshes of elytral reticulation more unequal. (Vancouver to Southern 

 California.) lutosus 



Tooth of anterior protarsal claw subapical in position, making the 

 claw appear almost bifid; male protarsus extremely broad; meshes of 

 elytral reticulation* rather smaller and more nearly equal. (Wyoming 

 to Nevada ) griseipennis 



6 



