CICINDELIM; 1 1 



Omus thoracicus n. sp. Form moderately ventricose, rather strongly 

 convex, moderately shining; head barely perceptibly narrower than the 

 prothorax, rugose, the front smooth medially, with small sparse punctures; 

 labral lobe broadly rounded and but slightly prominent; antennae slender, 

 moderate in length; prothorax peculiar, only very little wider than long, 

 the slightly rounded sides very moderately oblique posteriorly and, 

 near the anterior angles, feebly sinuate, the reflexed edge not attaining 

 the base; surface more strongly and uniformly vermiculato-rugulose 

 than in the other species of this group, resembling the sequoiarum 

 group in that respect; elytra elongate-oval, wholly devoid of humeri, 

 the punctures large but shallow, contiguous but irregularly crumpled 

 in outline; male tarsi of the audouini type. Female unknown. Length 

 14.0 mm.; width 5.6 mm. Oregon (Klamath Co.). 



This species has a very distinct appearance, owing to the ex- 

 ceptional form and sculpture of the prothorax and the irregularly 

 crumpled shallow elytral punctures. 



The following species and its several subordinate forms are dis- 

 tinguishable from audouini by the longer, slender antennae and 

 smoother prothorax, the lateral parts of the disk of which are less 

 rapidly declivous; the rapidly declivous side surface is very dis- 

 tinctive of audouini and its subspecies : 



Omus shastanicus n. sp. Male but slightly ventricose, somewhat 

 slender, dull in lustre, the elytra more shining; head moderate, very dis- 

 tinctly narrower than the prothorax, the vertex finely and feebly rugulose, 

 the middle of the front finely and rather closely punctate; four supra- 

 orbital setae very long, the eyes strongly convex; labral lobe broadly 

 rounded; antennae slender; prothorax distinctly wider than long, the 

 sides broadly, evenly rounded, oblique basally, the margin attaining 

 the fine basal furrow; surface nearly smooth, feebly rugulose anteriorly 

 and basally; elytra elongate-oval, without trace of humeri, strongly, 

 subevenly and moderately closely punctate; anterior tarsi of the audouini 

 type. Female broader and more ventricose than the male but otherwise 

 nearly similar, the surface lustre rather less dull, the antennae but little 

 shorter. Length 14.0-14.7 mm.; width 5.4-5.7 mm. California (Shasta 

 Co.). 



To be known readily by the moderate head, semi-opaque surface, 

 nearly smooth pronotum and almost regularly and rather deeply 

 punctured elytra. 



Omus shastanicus ssp. cephalicus nov. Body larger and more elongate 

 than in shastanicus, moderately stout, dull in lustre; head larger, finely 

 and feebly rugulose, the front finely punctate, the impressions shallower; 

 labral lobe prominent and transversely truncate medially; antennas 

 slender and rather long; eyes larger but less convex; prothorax similar in 

 form but larger and more opaque, with obsolescent fine vermiculate 



