152 [September, 



ia front, sides straight, base slightly rounded, not impressed. Elytra at the middle 

 about one-fourth wider than the thorax, impunctured, rufous, not very densely 

 covered with long hairs, humerus elevated, suture anteriorly depressed, base 

 with a very small fovea inside of the humeral impression. Beneath piceous, anus 

 testaceous. Feet entirely rufous, thighs very clavate. 



8. S. flavitarsis, latius fusiformis, pilosus, piceus, thorace antrorsum an- 

 gus'tato, basi non impresso, elytris basi vix impressis, femoribus valde clavatis, 

 tibiarum apice tarsisque flavis. Long. -08. 



One specimen, New York. Wider than the preceding, which it very much 

 resembles ; the antennae are dark rufous, they are formed as in S. Schaumii, but 

 the Yth joint is not perceptibly larger than the 6th. The elytra at the middle 

 are fully one-third wider than the thorax; the humerus is elevated and the base 

 is depressed from the humerus to the suture, but not foveate. The feet are pice- 

 ous, the thighs are very clavate, the extreme tip of the tibioe, and the whole of 

 the tarsi are pale yellow. The last joint of the maxillary palpi is much larger 

 than in S. Schaumii. 



9. S. fossiger, latius fusiformis, pilosus, piceus, thorace antrorsum valde 

 angustato, basi non impresso, coleopteris basi 4-foveatis, femoribus valde clavatis, 

 tarsis flavis. Long. -08. 



One specimen, Cambridge, Mass. Very similar to S, flavitarsis : the thorax is 

 much more narrowed in front, so that the apex is scarcely half as wide as the 

 base : the elytra at the middle are one-third wider than the thorax, the humeri 

 are elevated and the suture depressed, there are two basal foveae, of which the 

 inner is the smaller. The antennae are precisely as in S. flavitarsis ; the palpi 

 are yellowish, with the last joint distinct. 



10. S. capillosulus, latius fusiformis, pilosus, rufo-piceus, thorace antror- 

 sum angustato, basi subtiliter transversim impresso, coleopteris basi subfoveola- 

 tis, pedibus rufis, femoribus valde clavatis. Long. '08. 



Georgia, Pennsylvania and New York. Sometimes in the nest of a small fus- 

 cous ant with rufous legs. This species is very similar to S. Schaumii, but is 

 wider, and is known at once by the impressed line at the base of the thorax. 

 The antennas and palpi are precisely as in S. Schaumii: the humeri are more 

 elevated, the suture is a little elevated at base, and marked with a fine impressed 

 line, which curves around the base reaching the humeral fovea, the elytra at the 

 middle are fully one-third wider than the thorax. 



11. S. basal is, fusiformis, pilosus, rufas, thorace antrorsum angustato, basi, 

 subtiliter transversim impresso, coleopteris basi foveolatis, antennarum articulis 

 intermediis rotundatis, femoribus valde clavatis. Long. -06. 



Georgia and Louisiana. Very similar to the preceding, but smaller. The 

 antennae are as long as the head and thorax, the joints 3 7 are rounded, not 

 longer than wide : the three next are larger and also rounded ; the last longer, 

 oval and subacute : on the elytra, the suture is a little elevated anteriorly and 

 marked with a slight stria ; the base is slightly bifoveate, and the humeri are 

 elevated. 



12. S. hirtellus, latius fusiformis, breviter pilosus, rufas, thorace antror- 

 sum angustato, basi non striato, elytris obsolete punctulatis, basi vix foveatis. 

 antennis breviusculis articulis intermediis rotundatis, femoribus valde clavatis. 

 Long. -05. 



Georgia. This species is smaller than S. basalis, and the antennas are shorter 

 and less slender. The unimpressed thorax, shorter pubescence and scarcely 

 foveate elytra will readily distinguish it from the other species in which the 

 thorax and elytra form a regular outline, without any re-entering angle. One 

 specimen has the Blh joint of the antennas intermediate in size between the 7th 

 and 9th, so that the club appears only three-jointed. I am unable to perceive 

 any other difference, and in the absence of other specimens, leave it under the 

 present species. 



