31 Q 



1S73.] 'JJ-i/ [Horn.. 



tures and a faint impression opposite the scutellum. Elytral striae faintly 

 punctured, first dorsal extending three-fourths to apex, second nearly as 

 long-, third and fourth attaining the middle only, the latter arching at 

 hase, joining the sutural which is entire ; external subhumeral very 

 close to the marginal, humeral oblique, internal subhumeral finely im- 

 pressed attaining the tip of the first dorsal, but not joining the humeral 

 at base ; surface very sparsely punctured, punctures extending from the 

 apex two-thirds to base and as closely placed anteriorly as at the apex. 

 Propygidium and pygidium closely, but not densely punctured. Anterior 

 tibiae finely multidenticulate, middle and hind, tibia? finely spinulose. 

 Presternum strongly elevated, stria! short scarcely attaining the middle, 

 parallel. Length .10 inch ; 2.5 mm. 



This species is the only one of the group in which the presternum is 

 acutely elevated. 



One specimen in my cabinet from Florida. 



S. posthumus, Mars. Mon., 55, p. 400, pi. 18, fig. 82. 



Head densely punctulate, supra-orbital stria absent. Thorax sparsely 

 punctured at middle, sides more densely and coarsely, at base with 

 coarser punctures, and in front of scutellum a slight impression. Elytra 

 with first dorsal extending three-fourths to apex, 2-3-4 sub-equal, the 

 latter arching at base, joining the sutural which extends nearly to apex ; 

 strise punctured ; external subhumeral very short, humeral finely im- 

 pressed, external subhumeral formed of disconnected very coarse punc- 

 tures ; surface at apex very coarsely but sparsely punctured, punctures 

 extending from the first stria? to the suture, and anteriorly to the tips of 

 the other stria;, and thence anteriorly becoming rapidly finer and more 

 sparse. Pygidium rather densely and coarsely punctured, propygidium 

 more finely and sparsely punctured. Proscenium very feebly convex, 

 stria? deeply impressed, horizontal and very slightly convergent, extend- 

 ing four-fifths to apex. Anterior tibiae finely denticulate, middle and 

 hind tibia? spinulose. Length .14.-16 inch ; 3.5-4 mm. 



The external subhumeral is so short as to be with some difficulty ob- 

 served. The unusually coarse elytral punctures and the disconnected 

 internal subhumeral will at once distinguish it from any species of the 

 group. 



One specimen from Marseul in Cab. Leconte, and one in my own with- 

 out special designation of locality. I have received a specimen from Mr. 

 F. Blanchard, collected by him in Massachusetts. 



S. pseminosus, Lee. Ann. Lye. V., p. 1G6. 



Head sparsely punctulate. Thorax very sparsely punctulate on the 

 disc, at sides more coarsely but still sparsely, at base more coarsely and 

 opposite the scutellum a slight impression. Elytra with first dorsal ex- 

 tending three-fourths, second and third equal, extending slightly beyond 

 the middle, fourth slightly shorter and arching at base, joining the 

 sutural which is entire ; external subhumeral short but very distinct, in- 



