Coleopterological Notices. IGl 



If the student will have before him the figure of the antenna of 

 Phjsenuis (1. c. plate), he can more readily appreciate the differences 

 as indicated in the following description : — 



First six joints somewhat similar to the same in Physemus. Seventh joint 

 slender, cylindrical, nearly twice as long as wide ; eighth just visibly wider 

 than the seventh and one-half as long, triangular, the vertex of the angle 

 directed anteriorly, the posterior side straight ; ninth triangular, transverse, 

 the angle on the anterior side, the posterior side nearly straight, scarcely 

 longer and one-half wider than the eighth ; tenth almost evenly obtrapezoidal, 

 scarcely longer than the ninth but distinctly wider, two-thirds wider than 

 long, closely joined to the eleventh throughout the width; eleventh ovoidal, 

 pointed, slightly wider than the tenth, two-thirds longer than wide, slightly 

 longer than the two preceding joints combined and more densely pubescent. 



It will be seen, therefore, that the two genera are quite distinct 

 in antennal structure, the one having a two-jointed, and the other 

 a three-jointed club. 



The species — B. atomus Muls. — is somewhat smaller and more 

 finely and very much more feebly punctate than Physemus minu- 

 tus Lee. 



PARNID.E. 



THROSCIIVUS Lee. 



Elongate-elliptical, convex, punctate, pubescent. Head deflexed ; eyes and 

 labruui visible in repose ; epistomal suture fine, straight ; epistoma trans- 

 versely truncate at apex ; labrum large, transverse, convex, broadly, feebly 

 sinuate at apex ; antennae inserted at the sides of the front, base not concealed, 

 11-jointed ; basal joint twice as long as the second and much more robust ; last 

 six joints broader, forming a very elongate, slender, perfoliate club; last joint 

 of the maxillary palpi elongate, slender, acuminate, with a minute apical 

 process. Prosternum large, truncate anteriorly ; process very wide, with two 

 fine lateral carinas which extend diverging anteriorly for more than one-half 

 the distance from the coxse to the anterior margin, not grooved in the middle, 

 the apex broadly arcuate, received in a very broad shallow emargination of 

 the mesosternum ; the latter very short, widely separating the coxae ; meta- 

 sternum large ; episterna narrow ; posterior coxae widely separated, flat above, 

 sulcate beneath, triangular, prominent internally, only extending to the meta- 

 sternal epimera. Anterior and intermediate legs rather short, simple ; tarsi 

 all moderate in length, free, slender ; four basal joints short, subequal ; fifth 

 as long as the three preceding together. Epipleurae very narrow posteriorly, 

 broader, flat and sinuous toward base, not at all excavated or impressed for 

 the intermediate femora, the basal margin closely fitted throughout its width 

 to the hypomera ; the latter wide, flat, separated from the prosternal side- 

 Aknals N. Y. Acad. Sci., V, Feb. 1890.-11 



