IO2 MEMOIRS ON THE COLEOPTERA 



outer very feeble, sometimes represented by a small isolated rounded 

 impression; elytra oblong, three-fifths longer than wide, the parallel 

 sides feebly arcuate, the humeri only very minutely denticulate; 

 stride fine, impunctate, rather -well impressed, the intervals feebly 

 convex inwardly, strongly so laterally; hind femora (cf) obtusely 

 and subangularly swollen beneath a little beyond the middle, the 

 tibiae feebly bent, the inner crenelures of the male very long, feeble 

 and wave-like, the tarsi only slightly stout, the outer groove of the 

 basal joint not attaining the apex. Length (cf) 11.8-12.5, (9) 

 10.0-11.7 mm.; width (cf) 4.2-4.6, (9) 3.9-4.25 mm. British 



Columbia (Metlakatla) to Alaska amethystinus Dej. 



A Similar to the preceding but still narrower and with notably less 

 brilliant violaceous elytral lustre, the elytra nearly two-thirds 

 longer than wide, with still finer and less impressed striae, the inter- 

 vals usually nearly flat throughout the width, the hind legs similar, 

 except that the tarsal joints are slightly more constricted basally. 

 Length (cf) 10.3-12.0, (9) 9.5-11.2; width (cf) 3-65-4-3, (?) 

 3.5-4.15 mm. Northern California to Vancouver Island. 



novellus n. subsp. 



B Similar to amethystinus but much smaller and more slender, with 

 the prothorax not about as long as wide but distinctly wider than 

 long and with more strongly arcuate sides, the fine line diverging 

 from the margin posteriorly and approaching the inner impression, 

 then abruptly turning outward to the extreme tip of the basal 

 angles, more distinct and sharply defined than it ever is in 

 amethystinus; elytra narrower, sometimes barely as wide as the 

 prothorax; hind tarsi more slender, with the joints less cordiform 

 but not so slender or with so rectilinearly triangular joints as 

 injejumis. Length ( 9 ) 8.7-9.8 mm.; width 3.15-3.6 mm. British 



Columbia (Metlakatla), Keen metlakatlae n. subsp. 



Elytra without trace of violaceous lustre 7 



7 Form more broadly oblong, parallel, depressed, deep black and 

 strongly shining; head as in the preceding, the palpi testaceous, the 

 antennae and labrum piceous; impressions distinct, arcuate and very 

 strongly diverging posteriorly; prothorax almost as long as wide, the 

 sides broadly arcuate, obliquely and feebly converging posteriorly, 

 becoming not distinctly subsinuate basally, the angles finely, sub- 

 denticularly prominent; base and impressions as in the preceding, 

 except that the longitudinal impression is much shallower; elytra 

 much shorter, barely one-half longer than wide, the parallel sides 

 feebly arcuate, the striae rather fine but very deeply impressed 

 throughout, impunctate, the intervals all strongly and subequally 

 convex; legs short, the posterior (cf ) with the femora only feebly, 

 obtusely swollen beneath, the tibiae straight, strongly but obtusely 

 crenulate within except basally, the tarsi short and unusually stout, 

 the basal joint not quite twice as long as wide, with the external 

 groove very feebly impressed though entire. Length (cf ) 11.5-12.5 

 mm.; width 4.2-4.65 mm. California (Monterey), Dunn. 



obsidianus n. sp. 

 Form more elongate, nearly as in amethystinus but with longer elytra 



