Coleopterological Notices, IV. 681 



as long as the body in the female, sensibly shorter but otherwise 

 entirely similar in the male, very slender, cylindrical, glabrous, 

 shining, sparsely punctured in even series, evenly and strongly 

 arcuate from the antennae to the apex, but abruptly, strongly in- 

 flated, thickened but straight in lateral profile, spinose and veiy 

 densely covered with a rough crust of scales from that point to the 

 base ; antennae slender, the scape short, the basal joint of the funicle 

 subequal to the next two ; club moderate, oval, densely pubescent 

 and without distinct sutures. Prothorax much wider than long, 

 very strongly constricted and tubulate at apex, the base twice as 

 wide as the apex, transverse but deeply sinuate at each side of the 

 lobe, which is abrupt, prominent and rounded, its surface with a 

 dorsal impression receiving the scutellum ; disk uneven, a large 

 shallow impression on each side of the median line, behind the 

 middle, especially obvious. Scutellum moderate, slightly tumid, 

 oval, ogival behind, anteriorly prominent in the middle of the sinua- 

 tion which receives the thoracic lobe and slipping partially over the 

 surface of the latter. Elytra barely as long as wide, distinctly 

 wider and two-thirds longer than the prothorax, the sides rapidly 

 convergent and broadly evenly arcuate from base to apex, the latter 

 very narrowly rounded, ogival, with a small sutural notch ; striae 

 indicated only by very fine partings of the crust. Under surface 

 and legs densely clothed with a squamose crust of cinereous scales 

 and with short sparse erect and stiff setae. Length 2.6-3.2 mm.; 

 width 1.3-1.6 mm. 



Ohio, Kentucky and Iowa, apparently not rare and said to depre- 

 date upon the hickory; its habits are probably quite similar to those 

 of Balaninus. It should be remarked that in some species of Cen- 

 trinus, such as hospes, the beak is strongly inflated behind the an- 

 tennae, especially in the female and probably from causes similar to 

 those which have produced the inflation here ; but in Eunyssobia it 

 does not appear to be at all sexual in character, and, in the species 

 of Centrinus, the antennae are not inferior in insertion, although in 

 hospes they are inserted very near the lower margin, the scrobes 

 being broad and entirely inferior. 



PLOCAMUS. 



LeConte— Proc. Am. Phil. Soc, XV, p. 320. 



The single small species forming the type of this genus is unmis- 

 takably allied to Eunyssobia echidna, but differs in several peculi- 



