STUDIES IN THE AMERICAN BUPRESTID^ I49 



Form much stouter, convex, subinflated posteriorly, rather dull, blackish with 

 the depressions very obscure asneous above, the under surface very ob- 

 scure asneo-cupreous and black; head densely compresso-rugose, im- 

 pressed along the middle, the eyes smaller and only moderately prom- 

 inent; prothorax strongly, subangularly prominent at the sides just 

 before the middle, thence strongly, arcuately narrowing to the apex, 

 less strongly so with feebly sinuate sides to the base, very nearly twice 

 as wide as long, the surface deeply, obliquely impressed behind the 

 middle sublaterally and also with a deep rounded impression before the 

 middle at each side of the median tumid surface, coarsely, densely and 

 confusedly punctato-rugose laterally; elytra slightly wider than the 

 prothorax, the sides gradually rounding and then rather rapidly con- 

 verging in apical two-fifths, the prolongation narrow, moderate in 

 length but not abruptly formed; surface rugose laterally, coarsely 

 punctato-sulcate thence suturally, the surface sublaterally with the 

 elevations bordering the large areola posteriorly unusually strong, 

 giving a feebly undulated appearance; female with the terminal sinus 

 narrow and as deep as wide, the tooth very small and broadly angulate, 

 not extending posteriad through a fourth of its depth. Length ( 9 ) 

 18.5 mm. ; width 6.2 mm. Ontario severa n. sp. 



21 — Thoracic sulcus narrow and better defined 22 



Thoracic sulcus very broad, much dilated toward the base, less sharply 

 defined at the sides and generally mth a small central callus 24 



22 — ^Elytra with only a series of levigated spaces near the margin. General 

 characters nearly as in knehrosa (!) except that the pronotum has no 

 levigated elevations and the impressions, except the median channel, 

 which is better defined, more obsolete; elytra distinctly furrowed, 

 especially near the suture, the furrows punctured; the attenuated apex 

 of the elytra is longer than in tenehrosa, rather truncated and beneath 

 is of a dark blue; the prosternum is linear and the base of the abdomen 

 scarcely channeled; the teeth of the fifth ventral ( 9 ) are longer than in 

 tenebrosa and of a brilliant ruddy-copper. Length ( 9 ) 15. 5-18.0 mm. 

 British America, (found in latitude 54° and at Cumberland House). 

 [ =Stenuris tenebrica Kirby] tenebrica Kirby 



Elytra with levigated spaces almost throughout as usual 23 



23 — Color gray-metallic, often pruinose [as usual when fresh]; prothorax 

 more than twice as wide as long, the sides anteriorly strongly rounded, 

 posteriorly subsinuate, punctate, canaliculate, at each side behind the 

 middle obliquely and deeply impressed; elytra deeply striate, the inter- 

 vals with more obscure oblong spaces which are smooth and rather 

 elevated, posteriorly obliquely attenuate, prolonged, the apices rounded, 

 scarcelyi divaricate ; beneath sparsely pubescent, axiallysulcateas usual; 

 last ventral of the male tolerably deeply emarginate at apex, sinuate ;( 9 ) 

 with the lateral teeth rounded, the medial acute. Length 19. 2-2 1.2 

 mm. Lake Superior; [also British America] prolongata Lee. 



A — Form more elongate and parallel, the elytra narrowing more rapidly 

 behind in scarcely more than apical third, the prolongation long, 



