20 GEO. IT. HORN, M. D. 



it was therefore natural that he supposed this structure to be acci- 

 dental, and that the entire notch, in well preserved specimens, was 

 filled with the membrane. Since that time other specimens have 

 been taken by JMi'- C. H. Robei'ts, in Bennington County, Vermont 

 and all show the narrow border as illustrated. 



Occurs in northern New Jersey ( Jiilich) and Vermont (Roberts). 



O. foveicollix Lee. — Piceous, surface distinctly feiieous, leg.s pale. Thorax 

 rapidly, arciiately narrowed from a point one fourth from apex, beliind the 

 middle, a second sinuation, the transparent l)order broad, gradually arcuate; 

 apical margin with rather a deep sinuation within the angle ; disc regularly, 

 moderately convex, the surface smooth, with very few punctures; median line 

 deep and long, discal fovese moderately deep and well separated, lateral impres- 

 sions large f nd deep. Elytra moderately elongate, the margin narrowly ex- 

 planate a little beyond the middle, disc moderately convex with striie, of closely 

 placed, but with very coarse punctures, intervals at middle narrower than the 

 strise, the external wider. Length .04 — .06 inch. ; 1.2 — 2.5 mm. PI. ii, fig. 2. 



There is an extremely feeble emargination of the margin of the 

 labrum. Having typical specimens before me of foveicollis and tu- 

 berculatus, I have not been able to find any special difference, except 

 that the specimens of the former are smaller in size. 



Two individuals from Pennsylvania have the elytra rather more 

 oval, the punctures of the stride a little less crowded ; they may prove 

 a distinct species, but are not really more different than the limits of 

 difference observed in several other species. 



Occurs in New Mexico (Moqui Villages), Florida (Enterprise and 

 other places), Pennsylvania (Allegheny). 



O. Ifevipeiinis Lee. — Dark castaneous, a slight bronze lustre on the head 

 and thorax. Apical margin of thorax rather deeply sinuate within the angles 

 sides deeply and abruptly sinuate less than one-fourth from apex, a second sinua- 

 tion from middle to base, the transparent border wide and distinctly bisinuate ; 

 disc regularly convex, smooth and shining, with scarcely a trace of a puncture, 

 median line deeply impressed and long, the discal and lateral impressions re- 

 duced to two small fovese on each side in front. Elytra rather broadly oval, the 

 lateral border rather abruptly explanate a short distance behind the humeri and 

 continuing two-thirds to apex, disc convex, surface smooth and shining with 

 merely faint traces of the strife of punctures. Body beneath colored as above 

 legs pale. Length .05 inch. ; 1.3 mm. PL ii, fig. 3. 



This species is readily known by the very smooth surface and re- 

 duction in number and size of the thoracic discal im2:)ressions. 

 When the elytra are viewed directly from above, a short distance 

 from the humeri appears parallel on each side, caused by a subhu- 

 meral depression and the rather abrupt expansion of the margin 

 immediately posterior to it. 



One specimen in my cabinet from California (Fort Tejon). 



