new genera and species of CryptocephaVidce. 215 



Genus MoNAcnus, Suffr. 

 Monachus angulicoUis. 



Breviter ovatiis, valde convexus, niger, nitidus, facie 

 infei'iori, tibiis femoribusque anticis obscure rufis, subtus 

 piceus; thorace rufo, lateribus angulatis; elyti-is distiiicte 

 punctato-striatis, striis ad suturam et ad marginem late- 

 ralem sulcatis, interspatiis planis, extemis convexiusculis. 



Long. 1^ lin. 



Hab. — Columbia, Magdalena River. 



Head finely granulose-rugose ; eyes elongate, rather 

 deeply notched ; antennae scarcely longer than the thorax, 

 entirely black. Thorax twice as broad as long at the 

 base ; sides broadly margined, parallel and rather strongly 

 sinuate from the base to the middle, thence obliquely con- 

 verging to the apex, the two sections forming a distmct 

 angle at the point of junction on the middle of the 

 lateral border, apex of angle obtuse ; basal border slightly 

 oblique on either side, the medial lobe faintly reflexed, 

 concave-emarginate ; upper surface transversely convex, 

 cylindi'ical at the apex, finely but distinctly punctured, 

 the puncturing rather coarse along the basal margin ; 

 interspaces granulose- punctate. Scutellum more than 

 twice as long as broad, narrowly wedge-shaped, its apex 

 very acute, its basal margin obtusely rounded, entire. 

 Elytra broader than the thorax, convex, finely strigose on 

 the basal margin, rather strongly punctate-striate, stride 

 near the suture and on the outer margin sulcate ; two 

 outer interspaces slightly convex. 



Monachus obscuricollis. 



Bre\'iter ovatus, valde convexus, niger, subtus nitidus ; 

 thorace pedibusque fulvis, tarsis piceis ; supra minus ni- 

 tidus, granulosus ; capite nigro-piceo, rugoso, antennis 

 flavis, extrorsum nigris ; thorace obscure rufo, disco piceo 

 infuscato ; elytris punctato-striatis, striis pone medium 

 deletis, stria externa Integra, leviter sulcata. 



Long. 1 lin. 



Hah. — Para. 



Head nigro-piceous,tinged with cupreous, surface coarsely 

 punctured, rugulose ; antennje scarcely half the length of 

 the body, pale fulvous, the six outer joints bhick; labrum 

 and palpi also fulvous. Thorax nearly twice as bi*oad at 

 the base as long ; sides obliquely converging and slightly 



