NORTH AMERICAN COLEOPTERA. VI 



S. aiiiericaiins Muls. — Broadly oval, convex, color variable, thorax usually 

 orange with a central piceous space, elytra narrowly tipped with red. Head and 

 thorax sparsely punctate, the latter narrowed in front with feebly arcuate sides, 

 basal marginal line distinct. Elytra coarsely and moderately closely punctate ; 

 presternum with convergent elevated lines, which are variable in distinctness ; 

 metasternum rather coarsely and closely punctate at the sides, the mesocoxal line 

 arched, joining the suture near the front. Abdomen more or less yellow, mod- 

 erately closely punctate, the metacoxal line arcuate, approaching very close to the 

 first suture. Legs »usually yellow, but varying to black. Length .08 — .12 inch. ; 

 2 — 2.5 mm. 



The abdomen has but five segments, the hist two of the male feebly 

 broadly emarginate. Usually the head is yellow, specimens are not 

 rare black. The thorax may be almost entirely yellow, usually with 

 a median piceous space ; sometimes the angles only are yellow, while 

 several specimens before me are entirely black. The abdomen is 

 usually yellow, piceous at middle and base, but the entire color may 

 be black. The legs vary from yellow to black. 



Hdb. — New York southward to Florida and Texas, westward to 

 Illinois. 



S. caurinus n. sp. — Broadly oval, convex, outline continuous, entirely pi- 

 ceous, sometimes with the head and sides of thorax yellow. Head sparsely punc- 

 tate. Thorax narrower in front, sides feebly arcuate, very finely sparsely punc- 

 tate, basal marginal line not visible. Elytra moderately coarsely, not closely 

 punctate, the lateral elevated lines short ; metasternum at sides closely, roughly 

 punctate, the mesocoxal line joining the suture one-third from the front. Ab- 

 domen black, with five segments, closely punctate, tiie metacoxal line very nearly 

 touching the suture, curving to front and evanescent. Legs red. Length .08 — 

 .10 inch. ; 2 — 2.5 mm. 



This species varies from entirely piceous to those having the head 

 and a variable extent of the sides of the thorax reddish yellow. 

 The entirely black forms resemble tenehrosns, but difier in the form 

 of the metacoxal arc. 



Hab. — Washington, Oregon (Koebele) and Cal. (Owens Valley). 



Group D. 



The metacoxal line in this series forms a complete arc beginning 

 at the inner edge of the posterior coxal cavity, sometimes touching 

 at the apex of the curve the first suture, ending nearly ^ 

 at the anterior angle of the segment. The prosternal 

 lines are well marked and entire in all the species, usually 

 convergent to the front. The mesocoxal arc joins the 

 met-episternal suture near the front angle. The abdomen has five 

 segments, but rarely specimens show the sixth. 



TKANS. AM. ENT. SOC. XXII. (13) MAY, 1895. 



