394 



ENTOMOLOGICAL NEWS. [Dec. , '06 



Opacus is to be associated with thoracicus Csy. and latus Fall, 

 by its form and tarsal structure, but is very different from 

 either in its subopaque surface and fine sculpture. 



Pleocoma hopping! n. sp. 



Male. — Oblong oval, sides of elytra nearly parallel, color above and 

 beneath bright reddish brown, shining, head prothorax and underbody 

 densely clothed with long fulvous hair. Antennae very nearly as in hirti- 

 collis, clypeal horn deeply triangularly notched, lateral ante-ocular pro- 

 cesses subquadrate, their outer edge parallel with the axis of the body 

 (triangular in hirticollis, the external edge strongly oblique) ; vertical 

 horn emarginate at tip. Prothorax not quite twice as wide as long, hind 

 angles obtuse but fairly distinct, sides before them very slightly convergent 

 and just perceptibly sinuate, then rounded and strongly convergent to 

 apex ; basal margin evenly arcuate from side to side ; disk evenly con- 

 vex, only slightly flattened anteriorly, surface rather densely coarsely 

 punctate at the middle in front, less densely and somewhat more finely 

 at sides and posteriorly, a small subimpunctate area each side of the 

 middle of the disk. Elytra barely f as wide as long, sutural stria deep, 

 geminate striae feeble, punctuation fine and sparse, sides almost smooth. 

 The female differs as usual in its larger size and stouter form which is 

 wider behind ; the prothorax is glabrous and nearly uniformly punctate 

 throughout ; the elytra are more closely and strongly punctate than in 

 the male, being virtually as closely and strongly so as the prothorax ; the 

 clypeal notch is small, the sides obtusely rounded ; the ante-ocular 

 processes formed as in the male. 



Length $, 23-26 mm. ; 9, 30 mm. Width <J\ 13-14 mm. ; 9 20 mm. 



Described from a series taken by Mr. Ralph Hopping on the 

 South Fork of the Kaweah River, Cal., and bearing dates 

 Jan. 25 and Feb. 4. 



Because of its octo-lamellate antennae, and closely punctate 

 and hairy prothorax, this species is comparable only with 

 hirticollis. The latter, as we understand, is a distinctly smaller 

 and stouter species, the male always black or nearly so when 

 mature, the hair of a paler yellow, prothorax declivous and 

 plainly flattened in front, the posterior margin bisinuate, the 

 elytra more strongly punctured. There are some discrepancies 

 between the original description of Schaufuss and the later 

 ones of LeConte and Horn, and there is therefore a possibility 

 that our interpretation of hirticollis is erroneous. In Schau- 

 fuss' s description the prothorax is said to be almost three 

 times as wide as long, while Horn says ' ' more than twice as 



