CETONIIN/E 387 



head nearly as in that species; prothorax relatively very much 

 smaller and shorter but otherwise nearly similar; elytra relatively 

 much more inflated, scarcely as long as wide, more swollen at the 

 sides basally and fully two-thirds wider than the prothorax, the 

 lateral two transverse dashes of tomentum smaller, not prolonged 

 inwardly by pallid lines, the sculpture similar, except that the 

 punctures are everywhere much coarser; pygidium and tarsi nearly 

 similar. Length (cf) 9.2 mm.; width 5.0 mm. Michigan. A 

 single example ventricosus n. sp. 



10 Body moderately ventricose, shining, black, the legs sometimes ru- 

 fescent, the head and pronotum occasionally with greenish metallic 

 lustre, the elytra largely testaceous, black laterally; pubescence mod- 

 erate in length and density, not very conspicuous on the pygidium, 

 except on the flattened apical part in the female; head and prothorax 

 with the punctures small, dense on the former, well separated on the 

 latter, the clypeal sinus rather deep; prothorax slightly (cf) or 

 distinctly ( 9 ) wider than long, sometimes with a little tomentum 

 around the basal angles, the erect fringe moderately distinct; median 

 line rather distinctly, sometimes rather sharply, impressed; scutellum 

 with narrow smooth edges; elytra distinctly shorter than wide, rather 

 swollen near basal third; surface nearly as in viridans but with the 

 sparse punctures coarser, having at each side, but only on the dark 

 flanks, two transverse tomentose lines, never penetrating within 

 outer third and very different from the extremely extended oblique 

 lines of assimilis; coloration apically pale and black in alternating; 

 vittae; pygidium (cf ) as in viridans, wider in the female and flattened! 

 and more densely pubescent apically; hind tarsi not quite twice as 

 long as the tibiae in the male. Length (cf 9) 8.0-9.3 mm.; width 

 4.25-5.2 mm. Rhode Island to Vermont, westward to Michigan and 

 southward to North Carolina. Very abundant. [Trichius affinis 

 G. & P. and variabilis Schaum] affinis G. & P. 



Body very narrow, still smaller in size, suboval, rather shining, black, 

 with feeble aeneous or viridi-aeneous lustre, the elytra pale testaceous 

 throughout, except the black humeri, the flanks with the two opaque 

 areas darker brown; legs rufous; head two-thirds as wide as the pro- 

 thorax, the vertex transversely rather convex; punctures fine, not 

 very dense; clypeal lobes rounded, moderately reflexed, the sinus 

 moderately deep; prothorax small, nearly as long as wide in the male, 

 somewhat as in affinis in form and sculpture, the erect hairs fine and 

 rather inconspicuous, the latero-basal fringe long and composed of 

 much coarser hairs, like those of the scutellum, the margins of which 

 are finely smooth; median line broadly, feebly impressed; elytra 

 fully as long as wide, feebly inflated behind the base, two-fifths wider 

 than the prothorax; striae of the double sets very fine, well separated, 

 all the intervals in inner half subequally and distinctly convex, finely 

 and very remotely punctate, with short inconspicuous pubescence, 

 without tomentum, except the dash behind the scutellum; flanks 

 with two small transverse spots of tomentum, the convex marginal 

 bead black; pygidium (cf) as long as wide, convex, moderately 

 pubescent, with the sides tomentose, the crenulated transverse lines 



