Goleopterological Notices, VIZ. 289 



4 — Labrum bisinuate at apex,, the median lobe broadly rounded and mod- 

 erately advanced edvi'ardsi Cr. 



Labrum more deeply bisinuate, the median lobe more prominent, with its 

 apex transversely truncate ; elytra narrower, more elongate and more 



parallel montauus n. sp. 



5 — The marginal bead attaining the base, though frequently more or less im- 

 perfectly so, either as a specific or individual peculiarity 6 



The marginal bead obliterated well before the base 12 



€ — Sides of the prothorax very feebly convergent from apex to base and nearly 

 straight ; elytra short and stroDgly rounded at the sides ; general form 



very stout ( hornianum W. Horn, fide G. H. Horn) liorni Lee. 



Sides of the prothorax distinctly convergent from the apex 7 



■y — The sides nearly straight or at most feebly arcuate behind the middle ...8 



The sides strongly rounded behind the middle 11 



S — Labrum bisinuate, the median lobe more prominent than the sides 9 



Labrum nearly truncate ; pronotal sculpture moderately feeble 10 



9 — Elytral punctures separated throughout the greater part of the surface. 

 Pronotum smoother, the vermiculate sculpture more obliterated. 

 Antennse normal. 



Base of the prothorax nearly % as wide as the apex ; body rather stout. 



lugubris n. sp. 

 Base slightly more than % as wide as the apex ; body smaller and 



narrower |ilinctifroiis n. sp. 



Antennae decidedly stouter ; form nearly as in lecontei, but with the elytra 



widest at or behind the middle ailiMgUllS Schpp. 



Pronotum and head more or less deeply vermiculato-rugose, the rugosity 



variable in coarseness californiciis Esch. 



Elytral punctures close-set and confluent nearly throughout. 



confluens n. sp. 

 XO — Elytra widest before the middle, more pointed toward apex ; body mode- 

 rately slender , lecontei Horn 



11 — Labrum nearly truncate, the median lobe very feeble and broadly rounded; 

 sculpture of the head and pronotum deep and vermiculate as in califor- 



nicus sculptilis n. sp. 



Labrum deeply bisinuate, the median lobe more adAanced ; sculpture of the 

 pronotum feebler and more obliterated. 



Form stout. Southern Sierras §equoiaruiu Cr. 



Form slender. Sea-coast regions of California eloiigatu§ n. sp. 



12 — Body rather slender, the pronotum feebly sculptured and with the con- 

 verging sides nearly straight toward base audouini Kche. 



13 — Elytra broader posteriorly, the form nearly parallel ; side margin of the 



pronotum not attaining the base suljmetallicus Horn 



14 — Elytra regularly oval in form ; body rather stout ; side margin of the 

 pronotum attaining the base laeTiS Horn 



In being strictly peculiar to the Pacific coast regions west of 

 the crests of the Sierras, Omus is as characteristic in the Cicin- 



