AMERICAN COLEOPTERA. 257 



3. — Mptasternal episterna long, outer side longer than the anterior 8. 



Metasternal episterna short, outer side shorter than the anterior 9. 



9. — Thorax scarcelj' narrower at base than the elytra, sides not sinuate 10. 



Thorax narrower at base than the elytra, sides sinuate 11. 



10. — Body above green (as in serireus) ; legs entirely pale.. ..28. ailgustlis. 



Body above bluish black ; tibiie and tarsi black 29. viduus. 



11. — Male with anterior femora subangulate at base. 



Thorax as long as wide, sides distinctly sinuate 30. iejiitivns. 



Thorax wider than long, sides not sinuate .31. platyderns. 



Male with anterior femora simple 32. diffinis. 



8. — Male with anterior femora toothed at base 33. laticollis. 



Male with anterior femora suddenly narrower at base 12. 



Male with simple femora 13. 



13.— Legs black .34. orbus. 



Legs testaceous 14. 



14. — Thorax very densely punctate 15. 



Thorax very sparsely coarsely punctate. 



Prothorax beneath and abdomen very sparsely punctate. ..35. cnrsor. 

 Prothorax densely and coarsely punctured, abdomen moderately punc- 

 tate 36. Cliaticloiri. 



15. — Thorax strongly sinuate, hind angles rectangular, base not broader than 



apex .'. 16. 



Thorax very distinctly broader at base than apex, moderately or not 

 sinuate. 

 Smaller species, (.52 — .66 inch). Color green to blue, legs pale. 



37. sericeus. 

 Larger, (.84 — .90 inch). Color blackish, tarsi piceous. 



38. fascicornis. 

 12. — Thorax distinctly sinuate. Color and size o^ fuficicornis. 



39. erythropiis. 

 16. — Color black with tinge of blue, elytra very finely striate. 



40. Tiridifrons. 

 17. — Body above unicolorous, thorax feebly narrowed at base. 



41. herbacens. 

 Elytra with apical third rufous, thorax coarctate at base. 



42. riificauda. 



1. C validus, Chev.— Body beneath black, above green. Head brilliant 

 green, with few minute punctures, a deep wrinkled groove on each side ia 

 front, labrum truncate, antennse rufous. Thorax wider than long, sides moder- 

 ately arcuate in front, sinuate posteriorly, hind angles rectangular but not 

 prominent, disc moderately convex, moderately densely punctured along the 

 base and with coarser punctures along the median line, others arranged in 

 two irregular rows from each basal impression, a few along the lateral margin 

 and the middle of the apex; basal impressions deep, apical transverse impres- 

 sion very faint. Elytra broader at base than the thorax, basal line angulate at 

 humeri, strisB moderately deep at base, gradually finer toward apex, punctures 

 more evident at base, intervals finely but not densely punctured, sparsely 

 pubescent. Prosternum not margined, smooth except along the anterior and 

 lateral margins where there are coarse punctures, episterna smooth with a few 

 coarse and deep punctures near the suture. Metasternal episterna long, smooth 



TRANS. AMEE. ENT. SOC. V. (33) DECEMBKR, 1876. 



