Coleopterplogical Notices, V. 391 



O. incoluitlis Eriehs. — Gen. Staph., p. 791 ; Lee. : 1. c, p. 235. 



Head black; prothorax and abdomen dark brownish-rufous; 

 -elytra and legs pale flavate ; antennae rufo-fuscous, slightly paler 

 toward base ; integuments polished, glabrous, very finely, sparsely 

 punctate, the elytra a little more coarsely and deeply, the abdomen 

 finely punctate and sparsely clothed with short, stiff pubescence. 

 Head and prothorax without longitudinal grooves, the antennae 

 moderately incrassate, the tenth joint in the male strongly trans- 

 verse, the eleventh unusually long, equalling the preceding three. 

 Elytra equal in length and width to the prothorax. Abdomen 

 parallel, a little narrower than the elytra, the border rather thin 

 and deep. Length 3.5 mm.; width 1.0 mm. Southern States. 



One of the most distinct and isolated of our species, easily known 

 by the characters given above and by the parallel and feebly arcuate 

 sides of the prothorax. The sixth ventral of the male has at apex 

 two feeble, broadly cuspiform tubercles, separated by between one- 

 sixth and one-eighth of the width, the seventh produced in a flat 

 ligula, a little wider than long, with the sides rapidly convergent 

 to the feebly sinuato-truncate apex, the surface not beveled at its 

 apex, and the surface of the segment perfectly flat and even 

 throughout. 



O. mgOSUS Fabr. — Syst. Ent., p. 267 ; basalts Mels.: Proc. Ag. Nat. Sci., 

 Philai^, II, p. 41 ; rugulosus Harris nee Say. 



This fine species is too w^ell known to need extended notice ; the 

 American specimens do not differ at all from the European, except 

 perhaps in the less finely substrigose sculpture of the head. The 

 head is large in the male, with the antennae as long as the head 

 and prothorax, the outer joints not at all transverse and the eleventh 

 much shorter than the two preceding. Prothorax arcuately nar- 

 rowed from near the apex, as wide as the elytra and fully three- 

 fourths as long. Abdomen minutely granulato-reticulate and dull. 

 Length 4.2-5.0 mm. ; width 1.0-1.1 mm. United States and 

 Europe. I have not seen it, however, from the Pacific Coast. 



The mentum differs greatly from that of fuscipennis and the 

 other allied species preceding, having no trace of the transverse 

 groove ; it is rectangular, twice as wide as long, finely, densely 

 granulato-reticulate and dull, with a wide membranous apical 

 margin. The male sexual characters are also of a different type, 

 the fifth ventral having a strong porrect median tooth, the sixth a 



