Horn.J 0_-± [June 20, 



Var. distinguendus, Mars. Sutural stria as in the preceding. Punc- 

 tures of the elytra extending along the hist and second interatrial spaces 

 to base. Canada, Wisconsin. 



Var. sejunctus, Mars, (oregonensis, % Mars.) Sutural stria interrupted 

 near the base. Elytral punctures not extending forward between the 

 striae. New Mexico, Utah, Wyoming. 



The series before me being very much larger than those seen by Mar- 

 seul, I find myself compelled to unite all the above under one name. 

 The latter variety may seem distinct by the characters given, but the ex- 

 tent of punctuation varies in all the forms to such a degree as to be of 

 no value whatever in the separation of species. The interruption of the 

 union between the fourth dorsal and sutural striae, has caused Marseulto 

 place distinguendus and sejunctus in separate groups. I have specimens 

 which are true sejunctus in punctuation with the arc entire, and others 

 even with the sutural interrupted on one side and entire on the other, in 

 fact every conceivable variation between distinguendus, the most densely 

 punctured form, and sejunctus on the other extreme. 



This is an abundant species, occurring from Arizona to Oregon, and 

 along the eastern base of the Rocky Mountains, and eastwardly to 

 Canada. 



S. impressus, Lee. Bost. Journ. V., p. 74, pi. 5, fig. 10. 



Black, shining, legs piceous. Head very sparsely punctulate, frontal 

 stria interrupted at mi idle. Thorax at anterior angles slightly im- 

 pressed, disc smooth, sides coarsely punctured to the extreme margin, 

 base coarsely punctured and slightly impressed opposite the scutellum. 

 Elytra sparsely punctured at apex, punctures sparsely extending to base 

 along the first interstria, which is also wrinkled near the base ; external 

 subhumeral short, humeral oblique, finely impressed, joining the internal 

 subhumeral, which is slightly longer than the first dorsal ; the latter 

 extending two-thirds to apex, and equal to the third, second slightly 

 longer, fourth shorter than the third and arching at base, joining the 

 sutural which is entire. Propygidium and pygidium coarsely and rather 

 densely punctured, the latter more sparsely at apex. Presternum moder- 

 ately broad, stria? slightly divergent at apex and not ascending. An- 

 terior tibiae minutely denticulate, middle and hind tibia? finely biseriately 

 spinulose. Length .14 inch; 3.5mm. 



Two specimens, Georgia. 



S. infaustus, Lee. Proc. Acad., 1852, p. 40 ; piceus, || Lee. Bost. 

 Journ. V., p. 73. pi. 5, fig. 8. 



Piceous, shining. Head sparsely punctate, frontal stria wanting. 

 Thorax smooth at middle, sparsely punctured at sides and base, and 

 slightly impressed at the anterior angles. Elytra sparsely punctured at 

 apical half, punctures sparsely extending to base of first interstria ; ex- 

 ternal subhumeral scarcely evident, oblique humeral very fine, widely 

 separated from the internal subhumeral, which is strongly impressed and 

 longer than the first dorsal, the latter extending three-fourths to apex, 



