South- American Cokoptera. 287 



Palcestes tenuicornis, n. sp. 



Flavus, nitidus ; antennis gracilibus nigris, apice fuscis ; elytris plaga 



communi, tibiis tarsisque nigris. 

 3 . Long. 41 lin. 



This species is very close to P. bicolor, and is similarly 

 coloured, except that, instead of having the apical half of the 

 elytra black, there is only a large spot common to both elytra, 

 leaving the margins yellow ; the mandibles and clypeus are 

 also yellow. Besides the coloration, this species differs in 

 having the antennae decidedly more slender and relatively 

 longer ; this is the more apparent when comparing the apical 

 joints. The thorax is similar in form, but is merely sinuous 

 at the sides, without denticulations. 



Hab. Sarayacu. 



Rutelidse. 



Spododilamys mirabilisj n. sp. 



Oblonga, brunnea, seneo tincta, supra dense fortiter punctata, 

 subtus nitida ; pygidio dense asperato, fulvo hirsuto. 



3 . Thorace medio tuberoso, lateribus explanatis ; humeris dente 

 acuto armatis ; femoribus anticis subtus ante apicem dente magno 

 apico hamato ; tibiis anticis elongatis, ante medium curvatis. 



2 . Thorace simplici, fortius punctato ; humeris obtusis ; tibiis an- 

 ticis brevibus obtuse tridentatis. 



Long. 20 lin., lat. 11 lin. 



<$ . Head, thorax, and scutellum very densely and strongly 

 punctured, the narrow interspaces or rugulaj on the thorax 

 with fine punctures ; clypeus not quite twice as broad as long, 

 rounded in front, the margin finely reflexed. Thorax twice 

 as broad as long, semicircularly emarginate in front, bisinuate 

 at the base ; the anterior angles acute and a little porrect ; 

 the disk raised near the base ; the sides impressed above and 

 expanded, strongly angular rather behind the middle. Elytra 

 light brown, more or less tinted with green in the punctuation, 

 which is close, strong, and irregular, coarser at the base, fine 

 at the margins. Body beneath and legs pitchy, tinted with 

 eeneous ; the metasternum densely punctured ; the abdomen 

 sparingly punctured. Anterior femora with a strong flattened 

 tooth near the apex, the apex of the tooth acute and hooked : 

 anterior tibiae very long, narrow at the base, curved inwards 

 rather before the middle, the apical portion flattened and 

 broader, with three teeth on the outer edge, the upper one 

 obtuse. 



$ . More convex than the male, and presenting nothing 

 remarkable in form : broadest behind the middle of the elytra, 



20* 



