140 [August, 



treme apical margin testaceous. Beneath black, coarsely punctured, last three 

 joints of the abdomen yellow ; abdominal plates shorter than the segment, 

 smooth, punctured only at their base. Feet yellow. 



B 2 e. 



22. S. marginicollis, rotundato-ovalis, convexus, longius pubescens, 

 niger, capite thoraceque subtilius punctulatis rufis, hoc macula basali nigra, 

 elytris sat dense punctatis, femoribus anticis rufis. Long '095. 



Mannerheim, Bull. Mosc. 1843, 313. Muls. Cocc. 1053. 



San Francisco and San Diego, California. Rounded oval, convex, covered 

 with longer gray hair than usual. Head and thorax finely and sparsely punctu- 

 late, rufous ; the latter with a basal black spot, small in the male, large in the 

 female, base very finely margined, scarcely sinuate. Elytra not deeply but 

 tolerably densely punctured, entirely black. Body beneath black, densely 

 punctured, abdominal plates a little shorter than the segment, smooth at their 

 margin. Feet black, anterior thighs rufous. 



23. S. tenebrosus, subhemisphericus, niger, pubescens, thorace sub- 

 tilius punctulato, elytris minus dense punctulatis, pedibus testaceis. Long. 

 095. 



Muls. Cocc. 989. 



Southern States, not common. Almost hemispherical, black shining, covered 

 with fine pubescence. Head finely punctured, testaceous in the male, black in 

 the female ; mouth testaceous. Thorax sparsely and finely punctulate, base 

 margined, obtusely truncate at the middle, obliquely subsinuate each side. 

 Elytra distinctly, but not densely punctured. Beneath black, coarsely punc- 

 tured ; abdominal plates a little shorter than the segment, posteriorly smooth. 

 Feet testaceous. 



24. S. lacustris, breviter ovalis, convexus, niger, pubescens, elytris sat 

 dense punctatis, pedibus testaceis basi nigris. Long. '09. 



Le Conte, Agassiz' Lake Superior, 239 ; Muls. Cocc. 989, 



Var. <S. nigrivestis Muls. Cocc. 990. 



North shore of Lake Superior. Very similar to the preceding, but easily dis- 

 tinguished by the color of the feet. Oval, almost hemispherical, shining black, 

 fiinely pubescent. Head finely punctured, mouth testaceous. Thorax sparsely 

 and finely punctured, base margined, truncate in the middle, oblique each side. 

 Elytra moderately densely punctured. Body beneath black, densely punctured, 

 more finely upon the abdomen ; abdominal plates scarcely shorter than the 

 segment, smooth, punctured at base. Feet testaceous, femora black for two- 

 thirds the length. The apex of the abdomen of the male is more deeply 

 impressed than usual. Varies with the feet entirely black. 



25. S. abbreviatus, breviter ovalis, convexus, niger pubescens, elytris 

 confertim punctatis, pedibus rufo-piceis, abdominis laminis brevibus. Long. 

 085. 



One female. Eagle Harbor, Lake Superior. Oval, almost hemispherical, 

 black, densely pubescent. Head finely and densely punctured. Thorax sparsely 

 punctured on the disc, densely at the sides, base finely margined obtusely 

 rounded in the middle. Elytra densely and coarsely punctured. Body beneath 

 densely punctured ; abdominal plates three-fifths as long as the segment, mar- 

 gin smooth. Feet entirely dark rufous. 



26. S. nanus, rotundato-ovalis, convexus, nigro-piceus, parce pubescens, 

 thorace parce punctulato, elytris parce minus subtiliter punctatis, pedibus rufis. 

 Long. 'Oe. 



Two specimens, Missouri territory. Oval rounded, convex, blackish piceous, 

 sparsely covered with fine pubescence. Head finely punctulate, mouth rufous. 

 Thorax finely and sparsely punctulate, anterior angles rufous ; base margined, 

 obtuse in the middle. Elytra distinctly, but not densely punctured. Body 

 beneath punctured, abdominal plates not shorter than the segment, smooth at 



