238 GEO. H. HORN, M. D. 



This species is easily known by its very black velvety aspect with 

 the elytra feebly sculptured and squarely truncate at apes. 

 Occurs in Kansas, New Mexico and Arizona. 



S. lapponica Herbst. — Oval, slightly oblong, depressed, black opaque, 

 head and thorax pubescent. Head densely punctured with short erect yellow 

 hairs. Labrum broadly etnarginate. Eyes oval, oblique, not prominent. An- 

 tennae black with an oval club of four joints, the first glabrous, the terminal 

 longer. Thorax nearly twice as wide as long, sides arcuate and gradually 

 narrowed to the front, apical and basal angles obtuse, base feebly emarginate 

 at middle, on each side sinuate, disc irregular with vague tuberosities clothed 

 with darker pubescence, surface densely punctured and clothed with short 

 3'ellowish pubescence. Scutellum densely punctured. Elytra as wide as the 

 thorax, sides nearly parallel or very feebly arcuate, the margin moderately 

 reflexed, apex sinuately truncate, more prolonged in the female, disc flat, sides 

 declivous, surface tricostate, the outer shorter but more elevated terminating 

 at a tuberosity, second and third feebler but gradually longer, the intervals 

 with a row of moderately large tubercles between which the surface is obso- 

 letely punctate and with very short hairs; epipleural fold moderately wide, 

 concave. Body beneath moderately densely punctate and clothed with brownish 

 hairs. Length .48 inch; 12 mm. 



In the male the first four joints of the anterior tarsi are moderately 

 dilated. In the female the sutural angle of the elytra is much more 

 prolonged than in the male. 



The species varies in length a little larger or smaller from the 

 above measurement. It is an easily known species. 



Occurs from western Canada to x\laska, thence southward through 

 Oregon and California to Mexico, also in the region of the Plains. 

 I have not seen it from the region east of the Mississippi. 



S. tritwberculata Kby. — Oblong-oval, black, sparsely clothed with very 

 short hair. Head moderately narrowed behind the eyes, occipital impression 

 rather deep, surface densely punctate. Labrum short, broadly emarginate. 

 Antennse black, with four-jointed club, the terminal joint nearly as long as the 

 preceding two. Thorax about one and a half times as broad as long, narrowed 

 in front, sides moderately arcuate, base emarginate at middle, sinuate each 

 side, disc moderately convex with somewhat irregular surface, the sides slightly 

 flattened, surface densely punctured and with short pubescence. Scutellum 

 flat moderately densely punctate. Elytra as wide as the thorax and twice as 

 long, sides nearly straight, margin narrowly reflexed, apices in male conjointly 

 rounded, in female slightly sinuate and prolonged, surface coarsely but not 

 densely punctate, each puncture with a short recumbent hair, disc flat at sides 

 rather suddenly declivous and with three distinct costse, the outer more elevated 

 terminating at the tuberosity, the middle passing through the tuberosity and 

 often reaching the apex very nearly, the inner nearly reaching the apex. 

 Body beneath black, shining, moderately densely punctate. Length .36 — .44 

 inch; 9 — 11 mm. 



The anterior tarsi of the male are moderately dilated, the posterior 

 tibiae straight. 



