1880.J 181 [Horn. 



S. breviusculus, n. sp. Oval, slightly oblong, fades robust, piceous, 

 legs pale, surface feebly shining with distinct bronze lustre. Head punc- 

 tulate, rugulose at the sides above the eyes. Thorax broad, apex and base 

 equal, sides rather strongly arcuate, basal angles broadly rounded, base 

 feebly emarginate at middle, disc convex, sides slightly depressed pos- 

 teriorly, atmiddle more shining, finely transversely wrinkled, in front finely 

 punctulate, at base and sides denselj^ punctate and opaque. Elytra not 

 wider than the thorax, scarcely one third longer than wide, sides moder- 

 ately arcuate, apex scarcely at all sinuate, moderately deeply but finely 

 striate, intervals flat and irregularly but finely biseriately punctulate and 

 pubescent, serial punctures very fine and indistinct, eighth stria distant 

 from the margin. Body beneath feebly shining, abdomen sparsely punc- 

 tate and with short pubescence. Legs testaceous, middle and posterior 

 tibiae slightly arcuate. Length .26 inch ; 6.5 mm. 



This species is evidentlj^ allied to crassiusculus, eurmpes and arcuahi$, 

 which Putzeys unfortunately omits from his synoptic table. It is very dis- 

 tinct from any other in our fauna in its general aspect as well as by the 

 characters above given. 



One specimen in my cabinet from Fort Cobb, Indian Territory, collected 

 by Dr. Edw. Palmer, another in Mr. Ulke's cabinet. 



S. opalinus Lee. Oblong, black, surface rather brilliantly iridescent. 

 Head smooth, a foveate puncture more or less distinct on each side of the 

 vertex. Thorax broader than long, base as wide as apex or a little wider, 

 sides feebly arcuate, margin narrowly depressed and translucent, discfeeblj' 

 convex, surface sparsely indistinctly punctulate along the base, hind angles 

 distinct but obtuse. Elytra a little wider than the thorax, sides parallel rj* 

 or slightly arcuate ^, apex feebly sinuate, surface rather deeply striate, 

 intervals slightlj^ convex, more so at apex and sparsely indistinctly punctu- 

 late, serial punctures distinct but not large, outer interval very distinctly 

 punctate but not pubescent. Body beneath shining, abdomen sparsely in- 

 distinctlj^ punctulate. Legs rufo-testaceous. Length .36 — .40 inch ; 9 — 10 

 mm. 



This is our largest species of the iridescent series. 



Occurs from Wisconsin and Michigan to Florida and thence westward to 

 the Peninsula of California. 



S. gagatinus Dej . More slender and parallel than opalinus as well as 

 more convex. The surface is also less iridescent, the thoracic margin ex- 

 tremely narrow and not translucent. The punctures of the elytral intervals 

 are scarcely visible, while the marginal interval is absolutely smooth. 

 Femora piceous, tibiae and tarsi paler. Length .30 inch ; 7.5 mm. 



To this species I refer some specimens collected by me in early Spring in 

 Arizona which are probably immature. The head and thorax are rufo- 

 piceous and the elytra more finely striate than in the normal form. I am 

 unwilling to separate them until more mature specimens are seen. 



Putzeys states in error that the prosternum is margined in this species. 



Occurs from Massachusetts to Texas. 



