NORTH AMliKICAN COLEOPTERA. 211 



7. — C I. ypeo- frontal suture ohl iterated, the su])ra-()rl)itiil groove not extending 



on the front 8. 



Clypeo-frontal suture distinctly grooved and formed by the oblique exten- 

 sion of the supra-orbital groove 9. 



8. — Head and thorax more or less punctate. 



Form more or less oval ; thorax with a very distinct lateral margin, the 

 margin when viewed laterally convex downward. 

 Striae of elytra regular, except the two short ones exterior to the sev- 

 enth ; thorax nearly twice as wide as long, sides strongly arcuate. 



interrtiptuin. 

 Strife of elytra exterior to the fifth much confused; thorax one- half 



wider thau long, sides feebly arcuate aii^ustuluill. 



Form parallel; thorax very feebly margined, margin straight. 



paralleliiui. 



Head and thorax almost absolutely smooth lit^vicolle. 



9. — Tiiorax sparsely punctate or quite smooth 10. 



Thorax densely punctate, sometimes opaque and strigose 1.3. 



10. — Front with clypeus sparsely finely puuctate 11. 



Head numerously coarsely punctate; clypeus sometimes rugose. 



Elytra rufo-testaceous, the sides piceous; form depressed ltii'i<liilll. 



Elytra rufo-testaceous maculate, the spots sometimes forming an M-Iike 



mark; form convex iiiaculipeuiie. 



11. — Form short convex, Parm-like; elytra nearly as wide as long, entirely pale 



testaceous polliicidiini. 



Form oblong, subdepressed ; elytra very obviously longer than wide 12. 



12. — Thorax very distinctly punctate. 



Entirely testaceous palli<liilli. 



Elytra with a large lateral piceous space latorale. 



Thorax sparsely obsoletely punctate; surface dull, minutely alutaceous. 



fluridaiiiini. 

 13. — Punctures of thorax distinct, scarcely strigose; punctures of stria> coarse and 



regular puucf loolle. 



Punctures of thorax dense and strigose; j)unctures of elytra fine and more 

 or less irregular quei'catiim. 



It will he observed in the " Catalogus," as well as in the " Catal. 

 Enniolp." of Lefevre that the species have all been given the femi- 

 nine termination notwithstanding the fact that LeConte and Crotch 

 have both correctly taken the neuter, in accordance with the custom 

 in all genera with the termination "chroma," as Callichroma, Der- 

 matochroma, and others. 



M. seiieicolle n. sp.— Form quite like a Graphops, piceous shining, surface 

 with slight metallic lustre, which is more distinct on tlje head and thorax ; ely- 

 tral umbone and apex of elytra paler in color. Antennse rufo-testaceous, gradu- 

 ally darker to tip. Head moderately coarsely punctate and gradually more 

 closely from the occiput to the clypeus, a faint vertical impression ; eyes with a 

 very small emargination in front. Thorax a little wider than long, scarcely at 

 all narrowed in front, sides regularly not strongly arcuate, lateral margin very 



TRANS. AM. ENT. SOC. XIX. JULY, 1892. 



