AMERICAN COLEOPTERA. 241 



S. raniosa Say. — Oblong-oval, depressed, black, elytra varying from opaqiio 

 black to slightly bronze, without pubescence. Head oval, very little narrowed 

 behind the eyes, which are feebly prominent, surface densely punctured, 

 smoother in front. Labrum deeply emarginate. Antennae with an elongate- 

 oval club of four joints, the last three pubescent, the terminal longer. Thorax 

 about one-half wider than long, sides arcuate and gradually narrowing to the 

 front, the margin with asinootli narrow thickened edge, apex feebly emarginate, 

 the angles obtuse, base bisinuate with obtuse angles, disc feebly convex, very 

 densely and evenly punctured. Scutellum densely punctured. Elytra as wide 

 as the thorax, sides parallel or feebly arcuate, the margin reflexeil but of variable 

 width, apices conjointly rounded in tlie male or slightly obliquely prolonged 

 in the female, disc regularly convex, sides not declivous, surface with three 

 smooth irregular costae, feebly elevated with anastotiiosiiig branches from one 

 to the other, the intervals opaque from an extremely fine granulation and with 

 punctures moderately densely placed; epipleural fold moderately wide, con- 

 cave. Body beneath sparsely punctate and with short, sparse, brown hair. 

 Length .48— .70 inch; 12—18 mm. 



Id the male the anterior and middle tarsi are both dilated the 

 former a little more broadly. In the female the tarsi are slender and 

 the elytra a little more prolonged. 



In the wide extent of country over which this species is distributed 

 there is a certain amount of variation of form and surface lustre. 

 This has already been noticed by Dr. Leconte, (Proc. Acad. 1853, 

 p. 279), and requires no further mention here than to state that more 

 broadly oval forms occur with the margin more widely reflexed, these 

 are usually more opaque. The more oblong forms with the mai-gin 

 less widely reflexed are more shining and have often a distinct aeneous 

 surface lustre. 



Occurs from Wisconsin westward to Oregon and California, and 

 southwesterly to Nebraska, New Mexico and Arizona. 



S. opaoa Linn. — Oblong-oval, blackish, opaque, sparsely clothed with short 

 yellowish hair. Head short, a little broader behind the eyes then slightly 

 narrowed without occipital impression, surface densely punctured, clypeua 

 short, antennal fovea intermediate between the frontal margin and the eye. 

 Labrum deeply triangularly emarginate. Antennae black, not thick, the four 

 joints of the club not very much wider, the terminal conical at tip as long as 

 the two preceding together. Thorax very nearly twice as wide as long, slightly 

 narrowed in front, sides rather broadly arcuate, base broadly lobed at middle 

 on each side sinuate, disc at middle slightly more convex and somewhat irregu- 

 lar, at sides somewhat flattened surface densely punctured often with some 

 smoother spaces at middle. Scutellum flat, densely punctured. Elytra not 

 wider than the thorax, a little more than twice as wide as long, sides very little 

 arcuate, the margin narrowly reflexed, apices conjointly rounded in both sexes, 

 surface moderately densely punctate, each puncture with a short yellowish 

 hair, disc flat at middle, declivous at the sides with three costse, the outer more 

 elevated terminating posteriorly in a well-marked tuberosity, the middle nearly 



TRAXS. AMER. ENT. SOC. VIII. (31) AVGCST, 1880. 



