240 GEO. H. HORN, M. D. 



surface, punctuation moderately dense but not deeply impressed. Scutellura 

 flat, densely punctured. Elytra as broad as the thorax, sides slightly arcuate, 

 margin moderately wide and reflexed, apices conjointly rounded in the male 

 and slightly prolonged in the female, surface very distinctly and moderately 

 densely punctate, a slight tuberosity posteriorly through which two of the 

 costse pass, the inner costa is fine and entire extending from base to apical 

 margin, the middle is obliterated at its basal third but attains the apex, the 

 outer and stronger costa extends from the humeral umbone and after passing 

 through the tuberosity joins the second costa. Epipleural fold moderately 

 wide, concave. Body beneath moderately densely punctate and clothed with 

 short brownish hair. Length .52 inch; 13 mm. 



The males have the anterior tarsi very little broader than the female. 

 In both sesea the posterior tibiae are ai-cuate, more distinctly in the 

 male. The junction of the outer and second costa is not always abso- 

 lute, although in the vast majority there is a much closer approximation 

 than in any other of our species. 



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



S. americana Linn. — Broadly oval, depressed, beneath black, thorax 

 yellow with discal black space, elytra brownish with the elevations darker. 

 Head gradually narrowed behind the eyes, occiput transversely impressed, 

 surface moderately densely punctured, sparsely pubescent. Antennae rather 

 short, club gradually formed of five joints the last three pubescent, the terminal 

 longer. Labrum deeply emarginate. Thorax nearly twice as wide as long, 

 much narrowed in front, apex emarginate, sides feebly arcuate, hind angles 

 obtuse, base broadly lobed at middle, sinuate each side, surface densely and 

 equally punctured. Scutellum broad, densely punctured. Elytra a little wider 

 than the thorax, in some specitneus wider conjointly than long, sides moder- 

 ately arcuate, margin broad, apices variable in the sexes, disc feebly convex 

 with three very indistinct costse between which are anastomosing elevations, 

 the intervals moderately densely punctate. Epipleural fold broad, its inner 

 portion vertical. Body beneath black, moderately densely punctate. Length 

 .C4— .80 inch; 16—20 mm. 



In the males the anterior and middle tarsi are moderately and 

 similarly dilated, the elytra are always shorter and more obtuse at 

 tip, the sutural angle is slightly retracted but acute. In the female 

 the tarsi are not dilated, the elytra more obliquely prolonged and the 

 suture more distinctly retracted. 



Occurs everywhere from Hudson's Bay to Texas, and to the east- 

 ward of that line. 



I have adopted the Linnean name for this species in preference to 

 that of Catesby, whose name was published in 1731, prior to any of 

 the dates accepted as the starting point of our nomenclature and as 

 stated by Crotch the use of a binomial designation, for this species 

 was merely accidental, as Catesby had at that time no idea of the 

 binomial system subsequently proposed by Linnaeus. 



