Stiipliijliuidcc of the Amazon ValleT/. 363 



cliilus, antennis fuscis, basi cum pedibus testaceis, palpis 

 flavis ; fronte excavata et medio carinata ; thorace sub- 

 cylindrico, transversim rugoso-punctato ; elytris fortiter 

 piinctatis ; abdomine crebre, obsolete punctato. Long. 

 Corp. 1^ lin. 



Antenna rather short, the basal joints yellow, the others 

 infuscate ; palpi very pale yellow. Head rather narrower 

 than the elytra, between the eyes coarsely punctured but 

 distinctly shining; a little excavate, with a shining carina 

 along the middle. Thorax much narrower than the 

 elytra, much longer than broad, very little rounded in 

 front of the middle, and but little narrower at the base 

 than in the middle ; densely covered with a deep, trans- 

 versely rugose sculpture. Elytra along the suture quite 

 as long as the thorax, coarsely and closely punctured ; the 

 interstices near the suture rather broader than elsewhere. 

 Hind body slender, but a good deal narrower at the apex 

 than the base; the basal segment margined and finely 

 carinate in the middle, the two following segments scarcely 

 carinate, the segments rather closely punctured; the punc- 

 tures on the ante-apical segments obsolete, the pubescence 

 depressed, fine pale yellow. Legs slender, rather long, 

 yellowish ; the femora and tarsi darker towards the apex. 



Tapajos ; a single female. 



Obs. — This species is very closely allied to the S. cog- 

 nntus, but its more slender form, the smaller and more 

 shining area separating the eyes, and the more cylindric 

 thorax, leave me no doubt that it is specifically distinct 

 therefi'om. At first sight it suggests, to any one acquainted 

 with the European species, S. jnoditor or *S'. impressi- 

 pennis. It maybe well to give a detailed comparison with 

 the S. proditor. Besides the brassy colour of its upper 

 surface and the paler legs and palpi, S. cursitor has the 

 head more excavate and the central elevation narrower, 

 polished and impunctate. The thorax is much more 

 cylindric, with deep transverse rugte for sculpture ; the 

 punctures of the elytra are deeper and rather coarser; the 

 hind body is more slender and cylindric, the basal segment 

 only distinctly though finely margined, and the same 

 segment is finely carinate in the middle as in *S'. proditor, 

 but the following segments are scarcely carinate ; the 

 punctures on the basal segment are not very dissimilar to 

 those of *S'. proditor, but on the following segments they 

 are more indistinct ; the legs are about as long, but are 



