1904.] AMERICAX PHYTOPHAGOUS COLEOPTERA. 401 



Amongst the genera, of JIaltichwi with open coxal cavities and 

 a non-sulcate thorax, I know of none in which the latter part is of 

 similar shape, that is as long as broad ; this character and the 

 genei'al elongate shape, which resembles somewhat a Donacia, 

 will help to distinguish the genus. 



Agasioles vittata, sp. n. 



Black, the lower three joints of the antennfe fulvous, thorax 

 with an t\?neous gloss ; elytra nearly impunctate, flavous, the sutural 

 and latei-al margins as well as the apex and a longitudinal stripe 

 at the disc, abbreviated at each end, black. 



Length 6 millim. 



Head deeply and irregularly punctured, teneous, the frontal 

 elevations feebly marked, subquadrate ; clypeus broad, raised at 

 the middle, triangvdar ; palpi fulvous, the terminal joint small, 

 acutely pointed ; antenna? extending to the middle of the elytra, 

 Ijlack, the lower three joints fulvous, third joint shortei' than the 

 fourth, both thickened at the apex, the following joints shorter ; 

 thorax with straight sides, the angles obtuse, the suiface flat, 

 dark ?eneous, extremely minutely granulate and punctvired ; 

 scutellum broadly rounded at the apex, coloured like the thorax ; 

 elytra narrow and parallel, extremely minutely punctui-ed, a 

 sutural and lateral narrow stripe widened into a spot at the apex 

 and a, longitudinal band at the middle, not extending to the base 

 oi' the apex, greenish-black, the i-est of the surface flavous ; under 

 side and legs black ; last abdominal segment deeply longitudinally 

 sulcate, its apex strongly emai-ginate. 



Hah. Prov. Huallaga, Rio Mixiollo, Peru. 



Of this species a single specimen is contained in my collection 

 which I received fi'om M. Olavareau at Brussels, another is in that 

 gentleman's posession. The specimen before me is probably a male, 

 judging from the structure of the last abdominal segment and the 

 prominent pygidium. 



DlSONYCHA AMAZONICA, Sp. n. 



Head, the breast, and the legs pale piceous ; thorax testaceous, 

 impunctate ; elytra minutely punctured, black, the lateral margins 

 and a narrow transverse band at the middle flavous. 



Length 8 millim. 



Head impunctate, the vertex piceous, the lower portion tes- 

 taceous ; eyes large, oblong, with a single deep punctiu-e near 

 their inner margins, fi'ontal tubercles obsolete ; clypeus strongly 

 convex ; labrum black ; antenna? obscure fulvous, the basal joint 

 flavous, third joint shorter than the fourth ; thorax twice as broad 

 as long, the sides feebly rounded, narrowly margined, the anterior 

 angles obliquely rounded, the posterior ones acute, oblique, the 

 sui-face impunctate, shining, obsoletely transversely sulcate near 

 the base ; scutellum black ; elytra extremely finely punctured, 

 black, this colour interrupted at the middle by a nai-row transverse 



Proc. Zool. Soc— 1904, Vol. II. No. XXVI. 26 



