AMERICAN COLEOPTERA. 239 



lu some specimens the two inner costoe of the elytra are interrupted 

 near their apices and reappear near the apical margin as small oblong 

 tubercles, these two with the usual tuberosity gave to Kirby the 

 specific name. This species is the smallest in our fauna and resembles 

 a miniature inscqualia, but is more elongate and with the base of the 

 thorax emarginate at middle. It also resembles opaca, but the differ- 

 ences are still more important as will be seen under that species. 



Occurs in the Hudson's Bay region. 



S. iiiteqiialis Fabr. — Oval, slightly oblong, depressed, black, opaque. 

 Head gradually narrowed behind the eyes, occiput slightly transversely im- 

 pressed, surface moderately densely punctured. Labrum broadly emarginate. 

 Antennae black, rather short, club gradually formed of four joints the terminal 

 longer. Thorax twice as wide as long, narrowed in front, apex emarginate, 

 sides moderately arcuate, hind angles obtuse, base with a broad truncate lobe 

 at middle on each side sinuate, disc at middle with feebly elevated longitudinal 

 costse, the two at middle nearly straight, the outer t's^o sinuate, surface more 

 daknsely punctured at middle than at the sides. Scutelluin broad acute at tip, 

 ■densely punctured. Elytra as wide as the thorax, very little longer than wide 

 conjointly, sides moderately arcuate, margin broad and rather widely reflexed, 

 apices conjointly rounded in the male, slightly obliquely prolonged in the 

 female, disc flat at middle, obliquely declivous at the sides, with three costse, 

 the outer stronger and terminating one-third from apex in a slight tuberosity, 

 the two inner costae very feebly elevated, attaining the apical margin, intervals 

 obsoletely sparsely punctate. Epipleural fold broad, its inner portion vertical. 

 Body beneath more shining than above, sparsely punctate and pubescent. 

 Length .40 — .56 inch; 10 — 14 mm. 



In this species the anterior tarsi of the male are but feebly 

 dilated, the tips of the elytra conjointly rounded. In the female 

 the elytra are obliquely prolonged and the margin slightly sinuate 

 near the tip. 



This species could hardly be mistaken for any other species except- 

 ing possibly trituherculata, which is however more elongate, the lobe 

 of the thorax emarginate and the anterior tarsi of the male very dis- 

 tinctly dilated. Immature specimens at times resemble marginalis, 

 but this species is always more elongate and the elytra more coarsely 

 punctured. 



Widely distributed over the Atlantic region east of the Rocky Mts. 



S. noveboraceiisis Forst. — Oval, slightly oblong, beneath nearly black, 

 thorax piceous broadly margined with yellow, elytra brownish to piceous. 

 Head moderately densely punctate, occiput feebly transversely impressed. 

 Labrum moderately deeply emarginate. Antennae with four-jointed, elongate- 

 oval club, the terminal joint longer. Thorax about one-half wider than long, 

 narrowed in front, apex emarginate, sides moderately arcuate, the extreme 

 margin slightly thickened, base truncate at middle, sinuate each side, disc 

 moderately convex, sides broadly flattened, the former with slightly irregular 



