NORTH AMERICAN COLEOPTERA. 29 



Tibife sulcate on the outer edge. 



Setigerous punctures of the alternate intervals numerous ; tibise sulcate nearly 



their entire length pluripiiuetata. 



Setigerous punctures few, mostly on the third interval ; tibise sulcate lielow 



apical half only siibiiitida. 



Tibiffi rounded on the outer edge, not sulcate. 



Setigerous punctures numerous on first, third, fifth and seventh intervals. 



opacicollis. 

 Setigerous punctures entirely absent from first interval. 

 Thorax bright orange-red. 



Legs piceous respleiitleuiii. 



Legs pale yellow croceicollis. 



Thorax more or less piceous, body concolorous above. 



Thorax polished, the punctures fine, but distinct; legs piceous, the basal 

 half of femora and coxsB pale yellow bafsialiiii. 



The first three species occur iu Arizona and Lower California, and 

 are without metallic lustre, the others belong to the Atlantic region, 

 and have more or less metallic lustre. 



S. pluripiiuetata n. sp. — Body beneath and legs reddish brown, abdo- 

 men and elytra piceous, surface opaque, without metallic lustre. Antennfe half 

 as long as the body, brown or piceo-testaceous. Head scabrous, always darker 

 in color in the male. Thorax longer than wide, sides feebly arcuate, the base 

 slightly explanate, lateral margin rounded, without distinct edge even at base, 

 surface scabrous, opaque. Elytra striate, striae finely and closely punctate, in- 

 tervals very slightly convex, the alternate intervals 1-3-5-7-9 with setigerous 

 punctures extend<ing from base to apex, but not closely placed, surface subopaque. 

 Body beneath smooth, shining, Tibiip, sulcate their entire length on the outer 

 side. Length .213 — .37 inch ; 6- 9.5 nun. 



The antennae are a little more than half the length of the body, 

 the terminal joint in the female equal to the three preceding joints. 



The color described is that of fully mature specimens, but the 

 majority of those before me are imperfectly piceous as in very many 

 gagaiina. The sulcation of the outer edge of all the tibiie is seen in 

 but one other of our species. It is probable that some of the Mex- 

 ican species may have this charactei', but I have not found it men- 

 tioned. Only feitiales have been seen. 



Occurs in Arizona. 



S. siibiiitida Lee. New Species 1866, p. 141. —Piceous or dark brown, sub- 

 opaque. Antennae paler brown. Head sparsely punctate. Thorax finely scab- 

 rous, lateral margin obliterated. Elytra striate, striae closely, scarcely crenatelv 

 punctured, first interval with but three setigerous punctures placed near the 

 apex, third with six to eight from base to apex, fifth with about three near the 

 apex, seventh and ninth without any, a few near the margin close to the apex. 

 Body beneath smooth, feebly shining. Tibiae grooved on their outer edge near 

 the apex only. Length .28 — .43 inch ; 7 — 11 mm. 



