AMERICAN COLEOPTERA. 47 



Very similar to diadema, but the antennae and legs are yellow, or nearly so, 

 and the margins of the elytra pale; the dorsal line of the prothorax is 

 obsolete, and the diseoidal convexities less prominent. Length 9 — 11 mm. ; 



L. Sup.; Penn.; Ga 10. niodestiis Say. 



Color mostly yellow above, i)iceous beneath; head punctured behind, pro- 

 thorax smooth and shining, wider than long, sides widely explanate, parallel, 

 rounded in front; diseoidal convexities dark, dorsal line short; elytra tinged 

 witli piceous behind ; antennre and legs yellow ; specimens will doubtless 

 occur with the elytra dark colored, without pale margins. This species 

 differs from the two preceding by the less transverse prothorax, with less 

 rounded sides, and disc not at all punctured in front. Length 10 mm.; 

 Gala.; San Mateo 11. binotatns n. sp. 



8. — Head suddenly narrowed behind the eyes, neck short ; prothorax wider than 



long 9. 



Head much prolonged behind the eyes, neck long; prothorax not wider than 

 long 10. 



9. — Head, prothorax and margin of posterior ventral segments yellow; occiput 

 sometimes dark, elytra black, with pruinose pubescence. Length 10 — 



12 mm.; Gala.; Or.; Montana. 12. comes Lee. 



a. — Body^bove yellow, elytra blackish behind; gradatus Lee. 

 Head, prothorax, abdominal margin, and legs yellow, antennre dusky, yellow 

 at the base; elytra black with pruinose pubescence. Length 9 — 12 mm.; 



111.; Gal 13. tonK'iitusuN Say. 



a.— Elytral margins pale. 



10. — Head sparsely punctured behind, prothorax feebly punctured, dorsal line 

 deep; yellow, elytra black, coarsely rugose, abdomen more or less piceous. 



Length 11 — 14 mm.; Conn.; Ohio; Penn 14. protensus Lee. 



n.— Elytra yellow, gradually blackish behind ; protensu.i Lee. 

 Head and prothorax coarsely punctured, dorsal line deep; front sides of pro- 

 thorax, margins of elytra, Icjs, and base of antennre yellow. Length 7 — 



lOnnn.: Penn.; Ga.: III.; Tex 15. poricollis Lee. 



a. — Prothorax entirel}' j'ellow or brown ; hrunnicollts Lee. 



B.— Malthacus Kirby. 

 Muzzle broad in front of the eyes; head coarsely punctured ; fourth tarsal joint 



slightly emarginate 2. 



Muzzle short; fourth tarsal joint slightly emarginate 7. 



Fourth tarsal joint deeply bilobed 14. 



2. — Prothorax densely punctured, opake '• •"'• 



Prothorax sparsely finely punctured *>• 



3. -Dorsal line of prothorax feeble, convexities slight 4. 



Dorsal line deep, convexities prominent 5. 



4.— Black, prothorax with lateral spot red, sides slightly sinuate. Length 1 1 mm. ; 



Or.- Vane !"• scaber Lee. 



Piceous, anterior half of head, base of antenna; and margins of elytra pale; 

 prothorax ferruginous, narrower behind, sides repand. Length 1 1 mm. ; 



Penn.; Horn. 17. ciiictipeiiiiis Lee. 



5._Pieeous, anterior half of head, sides of prothorax and margins of elytra pale ; 

 prothorax not wider than long, narrower behind, sides sinuate. Length 

 9 mm.; N. H.; (Austin, Blanehard) 18. liinbellllS n. sp. 



