Horn.] 6x4: [June 20, 



Group II. 



Front not margined, middle aud hind tibite similar in form and spiuu- 

 lose. Prosternum horizontal, summit flat, striae converging and united 

 in front. 



The following species are contained in this group : 

 Sutural stria very short, basal, not joining the fourth dor- 

 sal by an arc. 



Antennal fosste narrowing the prosternum in front rotundatus. 



Sutural stria entire or nearly so, arching with the fourth 

 dorsal ; antennal fossae' not narrowing the prosternum. 

 Dorsal striae normal ; elytral sparsely punctured at apex. 

 Front without supra-orbital stria ; anterior tibite multi- 

 denticulate Behrensii. 



Front with supra-orbital stria ; anterior tibiae coarsely 



dentate planisternus. 



Third dorsal entirely absent, elytra at apex densely 



strigoso-punctate abruptly limiting the discal space rugipennis. 



S. rotundatus, Kugel. Schneid. Mag., p. 304 ; Mars. Mon., 1855, p. 

 503, pi. 19, fig. 119 ; deletus, Lee. Bost. Journ. V., p. 74, pi. 5, fig. 11 ; 

 'oar. communis, Mars. Mon., 18G2, p. 501, pi. 17, IV., fig. 4; var. inter- 

 ceptus, Lee. Ann. Lye. V., pp. 166 and 216. 



Piceous or black, shining, legs brownish-red. Head sparsely punctu- 

 late. Antennas brownish-red. Thorax coarsely punctate and with a 

 slight ante-scutellar imjiression. Elytra with the first dorsal stria entire, 

 but very fine beyond the middle, second and fourth equal, not extending 

 beyond the middle, third somewhat longer, fourth slightly arcuate at 

 base, fifth represented by a very short arc sometimes uniting the fourth 

 dorsal and sutural, the latter always very short, basal, never extending 

 beyond the basal fourth ; subhumeral of variable length not joining the 

 humeral ; epipleural fold with three feeble striae ; surface sparsely punc- 

 tured, punctures finer toward the sides and base. Pygidium and pro- 

 pygidium, moderately punctured. Prosternum strongly narrowed in 

 front, striaj gradually convergent, and uniting at the tij). Anterior tibias 

 5-denticulate, the second and third teeth more distant than the others, 

 middle and hind tibiie uniseriately spinulose, the latter the more finely. 

 Length variable, .10-.14 inch ; 2.5-3.5 mm. 



Var. interceptus, Lee. Elytral punctures coarser and apparently 

 denser. 



Var. communis. Mars. Punctures of the elytra more generally dif- 

 fused, and more distinct in the sub-scutellar region, striaj somewhat more 

 distinctly impressed. 



I have before me a specimen of rotundatus from Europe, and it is from 

 an examination of this, and a comparison of the other two forms that I 

 feel compelled to unite them as mere varieties. In fact the variation 



