298 Coleopterological Notices, V. 



O. Illldsonica. — Moderately stout, subparallel, convex, pale flavo-testa- 

 ceous throughout, the abdomen more rufous and less flavate, with a small dark 

 cloud occupying about the fourth tergite ; integuments polished, the head and 

 pronotum minutely and sparsely punctate, the elytra finely, densely, feebly 

 but subasperately, the abdomen rather coarsely, strongly, distinctly and not 

 very densely ; pubescence rather coarse, moderately dense, denser on the 

 elytra. Head longer than wide, evenly convex, a little more than one-half 

 as wide as the prothorax, the eyes moderate, black, at more than their own 

 length from the base; antennae very thick, cylindrical, scarcely longer than 

 the head and prothorax, the third joint but slightly shorter than the second 

 but strongly, evenly obconical, not twice as long as wide, four to six very 

 short and transverse, gradually wider, seven to ten equal, cylindrical, gradu- 

 ally a little longer but not wider, strongly transverse, eleventh obtuse at apex, 

 fully as long as the preceding two. Prothorax two-fifths wider than long, the 

 sides feebly convergent, evenly and distinctly arcuate from the broadly rounded 

 basal angles to the apex ; base and apex broadly arcuate, the former percepti- 

 bly the wider ; disk very strongly, evenly convex, without trace of impression. 

 Elytra moderately transverse, at base distinctly narrower, but at apex just 

 visibly wider than, the prothorax, distinctly shorter ; sides slightly divergent, 

 broadly arcuate toward base ; humeri concealed ; disk with a small sutural 

 impression behind the scutelium. Abdomen one-half longer than the anterior 

 parts, at base but slightly narrower than the elytra, and, at the apex of the 

 fifth segment, almost four-fifths as wide ; sides nearly straight ; border rather 

 thick ; fifth segment but slightly longer than the fourth. Legs somewhat 

 stout; hind tarsi slightly shorter than the tibiae, with the basal joint as long 

 as the next three. Length 2.7 mm. ; width 0.75 mm. 



New York (near the city). 



The infralateral carina of the head is fine but strong and entire, 

 and the facets of the eyes are rather hirger and more convex than 

 usual. The thick antennae, with their very peculiar and excessively 

 minute dense vestiture, totally devoid of erect setae, render this 

 species quite aberrant. 



O. flistiger. — Subparallel, convex, polished throughout, pale testaceous, 

 the head piceous ; abdomen more rufous, blackish behind the second segment 

 except at tip ; head finely, sparsely, the pronotum finely, rather less sparsely, 

 feebly but subasperately punctate, the elytra more strongly, subrugosely but 

 not more densely, the abdomen rather strongly, subasperately and not densely 

 so ; pubescence coarse, inclined, not very dense, longer and still sparser on 

 the abdomen, the latter without subapical bristles. Head wider than long, 

 three-fifths as wide as the prothorax ; eyes normal, at nearly their own length 

 from the base ; antennae short, very thick, scarcely as long as the head and 

 prothorax, the basal joint oblong-oval, nearly as long as the next two, second 

 thinner, one-half longer than wide and perceptibly longer than the third, 

 which is slightly elongate and obconical, fourth wider, strongly transverse, 

 fifth similar but wider, sixth to tenth longer than the fourth or fifth, compact, 



