NEBRIA, Latr. 



Middle sized species, having the maxillae armed beneath 

 with bristles. They live under stones, etc., near rivers 

 and brooks, in Northern regions or in high altitudes. Horn 

 classifies them (Trans. Am. Ent. Soc, III., p. 98.) : 

 A. — Humeri of elytra obliterated ; body either apterous 

 or feebly winged. 

 Hind angles of thorax recrangular. 

 Side margin of prothorax very narrow, color black. 1. ingens. 

 Side margin of prothorax wider, color brown. 2. ovipennis. 



Hind angles of prothorax not retangular ; sides oblique : 



color livid. 3. diversa. 



B. — Humeri of elytra distinct, at least moderately prominent. 

 Sides of elytra sub-parallel. 

 Metallic Species. 



Sides of thorax oblique, hind angles not rectangular ; 



color bluish metallic ; dors, punct. faint or wanting. 4 virescens. 

 Sides of thorax strongly sinuate, angles rectangular. 

 Elytra elongate, much longer than twice theWidth 

 at base ; slightly broader behind the middle. 

 Color purple : 3rd, 5th, and 7th, interstices 



with two or thresh punctures. 5. purpnrata. 



Color piceous black, with tinge of green. 3rd 

 stria with five or six small punctures. 6. gregaria. 



Elytra broader, sub-parallel, not lunger than twice 

 the width at base. 

 Antennae and legs black. 

 Elytra broad, depressed, deeply striate, dors, punct. 



very distinct. 7. metallica. 



Elytra more elongate and convex, stripe and punct, 



• faint. 8. Gebleri. 



Antenuaj and legs rufous or rufo-piceous. Four 



or five strong punctures on third interval. 9. viridis. 

 Black Species- 



Sides of thorax oblique, not sinuate near the base. 



Antennae and legs brown 10. obtusa. 



Antennae and legs black. 

 Elytra rather broad, parallel on the sides, 3rd 



stria with one dorsal puncture. 11. obliqua. 



Elytra narrower, with several dorsal punctures 

 on the third interspace, 

 Elytra obovate, wider behind, stria? faint. 12. longula. 

 Elytra parallel. .stripe deeper. 13. suturalis. 



Sides of thorax sinuate, hind angles rectangular. 

 Hind angles scarcely rectangular, dors, punct. faint. 



14. hudsonica. 

 Hind angles rectangular, dors, punct. distinct. 15. Sahlbergi. 

 Hind angles rectangular, dorsal punctures of third 

 and fifth intervals equallj- distinct and deep ; 

 femora rufous. 16. bifaria. 



Sides of elytra strongly arcuate. 

 Legs black. 



Hind angles of thorax very distinctly rectangular. 

 Interspaces 3rd, 5th, and 7th, interrupted with 



large punctures. 17. trifaria. 



Interspaces 3rd, 5th. and 7th, with a few small 



punctures. 18. Itathvoni. 



Hind angles scarcely rectangular. 19. Mannerheimii. 



Legs pale. 

 Hind angles of thorax rect angular. 20. Eschscholtzii. 



Hind angles not rectangular, sides of thorax oblique. 21. pallipos. 



