Coleoj)terological Notices, VI. 657 



Group I. 



ProHofum not tumid near the base. 



Elyti'a dark, with a pale transverse fascia behind the base; antennaj stout and 



short, the tenth joint not at all longer than wide 1. pinalicus 



Elytra unicolorous, or with the entire .basal region paler; antennae long, fili- 

 form, freqxiently distinctly and very gradually incrassate. 



Elytra distinctly transversely impressed near the base 2 



Elytra not impressed near the base, or very indistinctly so, smaller and more 



delicate species, the eyes moderate or small in size, 6 



■2 — Anterior lobe of the prothorax almost evenly rounded at the sides, widest 



at about the middle 3 



Anterior lobe unevenly rounded, more strongly so and widest near the base, 

 the constriction more abrupt; posterior lobe gradually and moderately 

 expanded to the base; head strongly, asperately punctate and compara- 

 tively small. California 5 



3 — Body and legs testaceous, the abdomen and posterior parts of the elytra 



generally black or piceous 4 



Body and legs black throughout 2. obscurus 



4 — Head asperately and more closely punctate. 



Anterior lobe of the prothorax subglobular; antennae very slender. 



3. Tigilans 

 Anterior lobe distinctly transverse, the antenntc a little shorter and thicker, 



with the joints distinctly less elongate 4. cursor 



Head minutely, remotely and not asperately punctate. 



Elytra slightly or not at all narrowed at base; posterior lobe of the pro- 

 thorax gi'adually expanded to the basal margin. 

 Antennae slender, the joints greatly elongate and subcylindrical. 



Elytra gradually narrowed behind the middle 5. alacer 



Elytra parallel, more abruptly and broadly rounded at apex. 



6. nubilatus 

 Antennae shorter and stout, strongly incrassate, the joints obconical. 



7. livid US 

 Elytra strongly narrowed at base, the posterior lobe of the prothorax cylin- 

 drical with the sides i^arallel; antennae rather stout and strongly incras- 



ate, [elegans \\ Laf.) 8. sturiui 



-5 — Body completely black, the legs sometimes feebly picescent; antennae 



moderately slender 9. nitidulus 



Body rufo-testaceous, the abdomen and posterior parts of the elytra black. 

 Antennal joints moderately elongate, obconical, much thicker toward apex. 



10. asperulus 

 Antennal joints greatly elongate, subcylindrical, only slightlj' thicker to- 

 ward apex 11. canonicus 



6 — Elytra pale at base 7 



El.vtra unicolorous 8 



^ — Elytra very feebly impressed, slightly dilated behind the middle. 



Eyes moderate, prominent; body black, the elytra pale only very near the 

 base; antennae long 12. oriiatellus 



