154 [September, 



7tb very little larger, globular : 810, one-half wider, rounded, somewhat trans- 

 verse, 11th nearly twice as long as the 10th, and obtuse. Thorax not wider than 

 the head, longer than wide, narrowed in front, very slightly narrowed on the 

 sides, finely pubescent, disc a little flattened, finely impressed transversely near 

 the base. Elytra scarcely one-third wider than the thorax, and forming with it 

 a very obtuse but distinct angle : elongate oval, disc flattened, finely pubescent, 

 very obsoletely punctulate, base with a fovea inside of the humerus. Legs tes- 

 taceous, anterior thighs strongly, posterior moderately incrassated. 



18. S. el a vi pes, piceus, capite glabro, thorace dense piloso, longiusculo, 

 antrorsum angustato et rotundato, basi transversim impresso, elytris rufescen- 

 tibus parce pilosis, basi foveatis, antennis articulis elongatis, femoribusclavatis. 

 Long. -05 06. 



Say, Long's Exped. to St. Peter's River, 2,272 : Schaum, Anal. Entom. 18. 



Lake Superior, Georgia, Louisiana. A darker variety is S. pilosicollis of my 

 catalogue of Lake Superior Coleoptera in Agassiz' Lake Superior. The head is 

 smaller in this than in the preceding species, oval, and glabrous; the elongate 

 slender antennae will also easily distinguish it ; their four last joints are nearly 

 one half thicker than those which precede, and are also longer than wide. The 

 female has broader elytra than the male, and somewhat shorter antennae. 



19. S. consobrinus, nigro-piceus, capite glabro, thorace longiusculo, 

 piloso antrorsum angustato etrotundato, basi transversim impresso, elytris parce 

 pilosis basi foveatis, antennis articulis penultimis rotundatis, femoribus clavatis. 

 Long. -05. 



One specimen, New York. In form this species is precisely similar to the 

 preceding, but the difference in the antennae seems sufficient to separate it. These 

 organs are here somewhat longer than the head and thorax ; the joints 3 6 are 

 equal, closely connected, and not longer than wide ; the seventh is a little larger 

 and slightly conical ; 8th, 9th and 10th are rounded, not longer than wide ; the 

 llth one half longer and subacute. 



20. S. b i c olo r , elongatus, piceus, capite glabro, thorace piloso elongate* 

 subcampanulato, basi transversim impresso, elytris parce piloso, non foveatis. 

 palpis pedibus antennisque testaceis, his articulis rotundatis, penultimus subtrans- 

 versis. Long. -06. 



One specimen, Georgia, with Formica pensylvanica. More narrow than S. 

 clavipes, piceous, very shining. Head elliptical, smooth, glabrous ; antennae a 

 little longer than the head and thorax, testaceous, joints 3 6 equal rounded ; 7th 

 one third larger, globular ; 8 10 one half wider than the 7th, rounded, slightly 

 transverse, llth not transverse, obtuse. Thorax covered with erect hair; one 

 half longer than wide, sides posteriorly straight, anteriorly much rounded; base 

 strongly impressed and subfoveate. Elytra twice as long as wide, nearly twice 

 as wide as the thorax, regularly narrowed each way from the middle, smooth, 

 not foveate at the base, with a few fine long hairs, especially towards the margin. 

 Feet yellow testaceous, thighs strongly clavate. 



B b. 



21. S. s alin ator, nigro-piceus, thorace piloso, longiusculo, lateribus antice 

 rotundatis, basi 4-foveato, elytris cum thorace angulum formantibus, glabris, 

 antennis articulis elongatis, tribus ultimis maioribus. Long. -06. 



Cambridge, Mass., in salt marshes. Very similar in form to S. clavipes, but 

 at once known by the antenuai having only three enlarged joints. Entirely black- 

 ish piceous; head oval, smooth, glabrous ; antennte half as long as the body. 

 Blender, joints 3 7 equal, a little longer than wide ; 8th one half longer and a 

 little thicker, somewhat conical ; 9th and 10th equal, a little longer, and nearly 

 twice as thick as the 8th ; llth subacute. Thorax covered with erect black hair, 

 a little wider than the head, longer than wide, narrowed in front, convex, slightly 

 rounded on the sides anteriorly ; base with four punctures. Elytra one half wider 

 than the thorax, and forming a very obtuse angle with it ; entirely glabrous, 

 slightly foveate at base. Thighs moderately clavate. 



