1873.] — i *J [Horn. 



Presternum with marginal line at tip ; surface opaque, 



foveolato-punctate planipes. 



Presternum not margined ; surface moderately shining, 



coarsely punctured subopacus. 



H. planipes, Lee. Proc. Acad. 1852, p. 39 ; Harri&ii\ Lee. Bost. 

 Journ. V., 1845, p. 14, pi. 1, rig. 11 ; Mars. Monog. 1853, p. 542, pi. 16, 

 fig. 1. 



Black, opaque, thorax less opaque than the elytra. Head densely 

 punctured, frontal stria well marked. Thorax densely and equally punc- 

 tured. Elytra opaque, foveolato-punctate, with six dorsal stria?, of 

 which four are entire, the fifth and sutural approaching at base and 

 obliterated, humeral- stria very short, subhumeral moderately impressed 

 obliterated at apex. Pygidium and propygidium densely foveolato- 

 punctate, the latter less densely than the former. Body beneath more 

 shining than above, foveolato-punctate. Presternum with marginal line 

 at apex. Legs shining, sparsely punctate. Length .26 inch ; G.5 mm. 



Occurs from Massachusetts to Georgia. 



H. subopacus, Lee. New Species, 1863, p. 60. 



Subopaque. Head densely punctured, frontal stria deeply impressed. 

 Thorax coarsely and densely punctured, more densely at the sides. 

 Elytra coarsely and rather densely punctured, punctures of sutural 

 interval fine ; each elytron with six dorsal stria?, the sutural and fifth 

 abbreviated at base, humeral stria very short, subhumeral moderately 

 impressed, abbreviated at base and continued at apex, by a row of coarse 

 punctures. Propygidium and pygidium coarsely punctured, the latter 

 more densely. Body beneath more shining than above, coarsely punc- 

 tured at the sides, more finely and less densely at middle. Femora 

 sparsely punctate. Presternum without marginal line at tip. Length 

 .24 inch ; 6 mm. 



Narrower, less convex and less opaque than planipes, and readily known 

 by the absence of the marginal line at apex of presternum. 



Two specimens are known, collected in Nebraska and Vancouver. 



Sub-genus Margarinotus. 



Marginal stria? of thorax confused, scarcely visible, the inner very dis- 

 tant from the margin. Hind tibia? slender at base, biseriately spinulose. 

 anterior five dentate, the upper tooth small. Elytra with the intervals 

 of the stria? with smooth sub-depressed tubercles, striae almost entirely 

 obliterated. Epipleura? of elytra either unistriate (guttifer) or not 

 striate (scaber). 



The only character separating Margarinotus from Ulster is the sculp, 

 ture of the surface of the body ; and not recognizing this to have any 

 great importance, I have united the former genus to the latter. 



H. guttifer, Horn. Proc. Ent. Soc. 1862, p. 167 ; Trans. Ent. Soc. 

 1870, pi. 1, fig. 5. 



As the sculpture of this insect has been as nearly produced as the 

 varying tendencies of the individuals admit, nothing further need here 



