228 PROCEEDINGS OP THE ACADEMY OF 



OLIGOMERUS Redt., Fauna Austr. 

 Muls. and Rey., Col. Fr. Terediles, 198. 



The European species, 0. brunneus, has 1 0-jointed antenna?, but I have 

 recently discovered a species which, without showing any other structural 

 difference, has but nine joints in the antennae. 



The species resemble in the form of antennas certain Hadrobregmi, but 

 may be at once distinguished by the anterior as well as the middle coxa? 

 being contiguous, without any intervening cavity for the reception of the 

 antennne. 



The species before me may be separated as follows : 



Sides of thorax feebly serrate, disc scarcely gibbous 1. s erica n a. 



Sides of thorax distinctly serrate ; 



Disc slightly gibbous ; antennae 2. ob tu s us. 



Disc strongly gibbous ; antennas 9-jointed 3. alternans. 



1. 0. sericans. Anobium sericans Mels., Proc. Acad. Nat. Sci., ii. 309. 

 O. thoracicus Lee, Class. Col. N. Amer., 205. 



Middle States. I received a specimen of this species from Dr. Melsheimer 

 under the name A. thoracicum, and in citing it did not refer to his original 

 description, by which it appears that the name is a synonym of his A. s e r i- 

 c a n s. It will be readily distinguished from the other species by the thorax 

 being but feebly serrate on the sides, with the hind angles not obvious, and 

 the disc very feebly elevated behind the middle, being scarcely gibbous. 

 There are five small but distinct joints between the second joint, and the 

 elongate ones ; the antenna? are therefore 10 jointed. The striae of the elytra 

 are strongly punctured, the outer ones are deep, and those towards the suture 

 shallow ; both punctures and striae become obsolete at the tip. 



2. 0. obtusus, elongatus, cylindricus, fusco-ferrugineus, subtiliter se- 

 riceopubescens, thorace lateribus serratis, angulis posticis obtusis, distinc- 

 tis, disco punctulato, opaco, ante basin modice elevato ; elytris apice sub- 

 truncatis, striis punctatis, apice haud obliteratis, externis profundioribus. 

 Long. -02. 



One specimen from Vermont, Prof. C. B. Adams. Larger than the preced- 

 ing, of a different color, and quite distinct by the form and sculpture of the 

 thorax, which is distinctly and densely punctulate, more convex, with the 

 disc more elevated in front of the base ; the sides are more distinctly serrate, 

 the hind angles are obtuse, and but slightly rounded ; the reflexed side mar- 

 gin is narrow, and the transverse impressions at the anterior angles are 

 deeper. The antennae are mutilated, but appear to have been 10-jointed. 



3. 0. alternans, nigro-piceus, opacus, pube brevi fusco-cinerea seri- 

 cea dense vestitus, thorace latitudine fere duplo breviore, punctulato, lateri- 

 bus serratis valde rotundatis, angulis posticis haud distinctis, disco valde 

 convexo, leviter canaliculato, postice elevato, gibboso, et utrinque impresso, 

 elytris striis fortiter punctatis externis profundis, interstitiis lmo, 3io, 5to et 

 7mo prominulis versus apicem subreticulatim connexis ; antennis 9-articula- 

 tis. Long. "20. 



One specimen found by me on a fence near Long Branch, New Jersey, July, 

 1865. This species is very distinct, not only by the strongly gibbous thorax, 

 but by the peculiar sculpture of the elytra; the striae are more impressed 

 than in the other species ; the sutural interval and the alternate ones, as far 

 as the seventh, are more convex than the intervening spaces, and are irregu- 

 larly connected towards the tip by a few anastomosing elevated lines. The 

 antenna? are fusco-testaceous ; the third joint is nearly is long as the three 

 following, which are short, but quite distinct; they are followed by the elon- 

 gated joints, each of which is as long as the joints 1 6 united, and about 



[Oct. 



