Casey — A Revision of the American Paederini. 55 



anteriorly, feebly carinate posteriorly; pronotum very convex, ex- 

 tremely minutely punctate, without much more than a narrow trace of 

 a smooth median line, the surface prominent at the middle near the base 

 and bi-impressed as in Scopaei; elytra much wider than the prothorax, 

 nearly as wide as the head, closely punctate, the sutural bead evident; 

 abdomen rather narrower than the elytra, the segments only feebly im- 

 pressed at base; legs long, very slender, the tarsi long, filiform, the 

 first and fifth joints elongate; sexual characters of the male consist- 

 ing of feeble transverse folds on the second and third ventrals and 



apical emargination of the sixth. Amazon *Scopaeodes 



Body very slender and of remarkably specialized structure throughout, 

 scopaeoid in form, moderately convex, shining, finely, inconspicuously 

 punctured, the head more coarsely and sparsely so throughout but more 

 coarsely anteriorly than posteriorly; coloration pale; head elongate- 

 oval, not abruptly narrowed before the eyes which are before the middle, 

 rather small, prominent and very coarsely faceted ; posterior outline 

 semicircular, the median part of the base forming an abruptly project- 

 ing collar inclosing the neck; sides without post-ocular foveolae but 

 with a deep longitudinal groove extending along the lower margin of 

 the eyes, and gradually becoming attenuated to the neck; upper margin 

 of the eyes also bordered by a deep groove which does not extend be- 

 hind the eye; front strongly tritumorose ; labrum very short, biobliquely 

 and rectilinearly truncate, with a feeble median sinus, edentate; men- 

 turn very small; labial palpi slender, normal; maxillary palpi strongly 

 specialized, the second joint slender, the third strongly inflated and 

 rounded in outline but abruptly constricted at base and obliquely joined 

 to the second by a slender peduncle; gular sutures completely united, 

 forming a fine median stria anteriorly becoming a broad coarsely im- 

 pressed groove posteriorly; mandibles bidentate within, the left at 

 least strongly grooved externally; antennae rather thick, submonillform, 

 the basal joint cylindrical, thick and not much longer than the next two 

 combined, the second and third subequal; prothorax elongate-oval, 

 gradually attenuate anteriorly; prosternum extremely long before the 

 coxae, almost evenly and strongly convex; pronotum tumid in the 

 middle near the oase, the median impunctate line obvious ; elytra wider 

 but not longer than the prothorax, the sides diverging, obscurely 

 punctulate, the surface impressed at each side of the suture toward 

 base only; abdomen narrower than the elytra, the segments feebly im- 

 pressed at base ; legs moderately slender but not very long, the anterior 

 tibiae strongly, obtusely dentate within, the intermediate slender and 

 cylindric, the posterior gradually thicker from base to apex, the tarsi 

 rather long, slender, the basal joint of the posterior about as long as 

 the next two together but much shorter thau the fifth ; claws well devel- 

 oped, Amazon. \_=^ SphaeriniumShp. — nom. praeocc.]..*Sphaeronium 



The name Sphaeronium was substituted for the original 

 Sphaerinium by Dr. Sharp, and the genus is founded upon a 

 species described under the specific name pallidum by that 

 author. The type of Scopaeodes — a name somewhat unfor- 



