ClCINDELID^ 9 



dilated; copulatory spicule more abruptly bent downward, the apical part 

 more elongate, the posterior outline without the obtuse angulation 

 usually evident in audouini. Female unknown. Length 13.5 mm.; 

 width 5.0 mm. California (Humboldt Co.). 



Readily distinguishable from audouini by the shorter and very 

 slender antennae, smaller size, shorter form and by the structure of 

 the male sexual spicule. 



Omus audouini ssp. aequicornis nov. Male much smaller and more 

 abbreviated than in audouini; head and prothorax nearly similar, the 

 eyes smaller and more convex, the antennae much shorter, nearly as in 

 brevicornis but less slender; labral lobe short, broadly truncate; elytra 

 shorter and less convex than in audouini, the rather irregular punctures 

 not so close, shallower and less well denned, the interspaces more alu- 

 taceous and with distinct fine sparse punctulation; anterior tarsi nearly 

 similar; intromittent spicule gradually curved downward, the narrowed 

 apical part much longer and more slender, much less abruptly deflexed 

 than in brevicornis. Female notably larger than the male, even more 

 obviously so than in audouini, the antennae almost exactly as in the male, 

 the head and prothorax relatively stouter than in that sex. Length (cf) 

 12. o, ( 9 ) 14.0 mm., width (cf ) 4.6, ( 9 ) 4-9 mm. Oregon (Josephine Co.). 



A small and delicate form, strictly of the audouini type, but there 

 is a surprising divergence of structure in the copulatory spicule, 

 even among these obviously related subspecies. 



Omus audouini ssp. tacomae nov.- Body elongate, less ventricose than 

 in audouini; head, prothorax, labrum and antennas nearly similar, but the 

 sculpture of the head throughout is much deeper, the punctures at the 

 middle of the front distinctly coarse, deep and more close-set; elytra 

 narrower and relatively more elongate than in audouini, oval, the punc- 

 tures larger and closer, subconfluent, the general surface rather more 

 alutaceous; supplementary coriaceous abdominal segment of the female 

 more deeply emarginate than in that species. Male unknown. Length 

 14.7 mm.; width 5.3 mm. Washington State (Tacoma). 



The type is piceous, with rufous tarsi, evidently because of im- 

 maturity, though there is no distortion in drying. The species 

 parvulus Csy., belongs immediately after audouini in a systematic 

 arrangement. 



Omus audouini ssp. delicatulus nov. Body slightly smaller, narrower 

 and less ventricose than in audouini and with a very feeble subviolaceous 

 hue on the shining elytra; head moderately rugulose, the two impressions 

 distinct, the front finely, sparsely punctate medially; labrum very broadly 

 rounded and but feebly advanced medially; antennae extending onto the 

 base of the elytra, slender, the fifth joint three times as long as wide; 

 prothorax as in audouini, alutaceous, very feebly rugulose; elytra fully 



