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pressed alon.a; the whole base, sinuate on .the sides, tip strongly 

 constricted and tubular; pubescence not golden; elytra rounded 

 and margined at tip; mouth and gence rather stout. 



Elytra testaceous, with a large blotch behind the middle, extending to the 

 margin, but not the suture, and tip black; markings sometimes 

 faint matthewsii. 



Entirely black, more coarsely punctured grossa. 



Ae. 



Prothora.x coarsely, elytra very coarsely punctured, truncate and spinose; 

 antennce 9 short, thickened externally .... brevicornis. 



Prothorax densely and coarsely punctured; antennae slender; elytra sharply 

 truncate at tip nigrella. 



Prothorax sparsely punctured; antennae slender; elytra feebly truncate at tip. 



carbonata. 

 B. 



B a. — Antennae annulated with yellow, nth joint distinctly divided; elytra 

 narrowed from the base, tip truncate and dentate; fj' antennie 

 serrate, and 5th ventral flattened triangularly, emarginate and 

 bidentate (canadensis to circumdata) 



B b. — Antennre annulated or nearly black, subserrate in (J", with the nth 

 joint feebly appendiculate; elytra narrowed from the base, very 

 dehiscent at tip, which is nearly rounded and indistinctly mar- 

 gined; form short and very stout . . (vagans and dehisceus) 



Be. — Antemice not annulated, nth joint scarcely appendiculate; elytra 

 slightly narrowed from the base, sharply truncate at tip; pro- 

 thorax scarcely constricted behind . . (sangainea to dolorosa) 



B d. — Antennae not annulated, nth joint scarcely appendiculate; elytra 

 slightly narrowed from the base c?, almost parallel 9, elevated 

 at the base, elongate, scarcely truncate, not densely, but very 

 finely pubescent; yellow with black spots or bands; prothorax 

 bell shaped, transversely depressed at base, which is more 

 deeply sinuate than usual .... (crassipes to octonotata) 



B c. — Antenna; annulated, nth joint not appendiculate; elytra parallel, 

 elongate, npt elevated at base, truncate at tip; prothorax bell 

 shaped, constricted strongly at tip, and less strongly at base; 

 hind angles of head obtuse, genae moderate, front with a trans- 

 verse impression (pedalis) 



Ba. 

 Elytra rj' and 9 truncate-emarginate at tip; prothorax more deeply con- 

 stricted behind; antennae strongly appendiculate, rj' strongly 

 serrate almost entirely black, 9 feebly serrate, joints 4-11 an- 

 nulate with yellow; black, elytra more or less red . canadensis. 

 Elytra truncate at tip. rf sometimes feebly emarginate; prothorax feebly 

 constricted behind. 

 Elytra entirely red; antennae ■J' and 9 with joints 1-5 black, nth joint 

 feebly appendiculate; c? antennae serrate, abdomen red, 9 an- 

 tennae nearly filiform, abdomen black rubrica. 



Elytra pale, side margin and tip black; small species . . . circumdata. 



