342 PROCEEDINGS OF THE NATIONAL MUSEUM vol.94 



ously hairy, hairs very short; posterior tibia compressed but not broad; 



prothorax conical and about as long as broad 8. scutata, new species 



10. Head and thorax black or brownish black, more or less faintly tinged with 

 metallic green, sutures around base of wings, scutellum basally, axillae 



dorsally, and pleura sometimes diluted with reddish 11 



Head reddish testaceous; thorax variable but usually reddish testaceous, 

 mesoscutum sometimes more or less tinted with metallic green posteriorly ; 

 only one species with thorax extensively marked with dark brown or 



blackish. 



12 



11. Marginal vein about twice as long as stigmal vein; lateral ocellus a little 



more than its own diameter from eye margin; frons obviously sculptured 

 but weakly so; concave posterior portion of mesoscutum smooth and pol- 

 ished; eyes bare or very nearly so 9. picea (Howard) 



Marginal vein obviously a little more than twice as long as stigmal vein; 

 lateral ocellus not more than its own diameter from eye margin; frons 

 dull, with very distinct reticulate sculpture; concave posterior portion of 

 mesoscutum weakly sculptured; eyes distinctly pilose 



10. frontalis, new species 



12. Frons above scrobicular depression perfectly smooth and polished; meso- 



scutum uniformly testaceous or with only faint metallic reflections pos- 

 teriorly ; forewing with infuscated area clothed with pale yellowish, scale- 

 like hairs on anterior portion, hairs on a little less than posterior half of 



its width darker 13 



Frons above scrobicular depression not perfectly smooth, weakly reticulated; 

 concave posterior portion of mesoscutum daik with metallic green reflec- 

 tions, prescutum and inner faces of scapulae also usually dark metallic; 

 anterior half of mesopleuron usually dark brown with weak metallic reflec- 

 tions; forewing with infuscated portion uniformly dark except for a 

 narrow proximal border, which is paler__^ 11. aldrichi, new species 



13. Concave posterior portion of mesoscutum nearly bare, with only a few weak 



and inconspicuous hairs scattered over surface; scape reaching level of 

 vertex ; hypopygium extending very nearly to apex of abdomen 



12. ferruginea, new species 

 Concave posterior portion of mesoscutum clothed with conspicuous, short, 

 silvery hairs ; scape not quite reaching level of front ocellus ; hypopygium 

 attaining approximately apical one-fourth of abdomen 



13. abstrusa, new species 



14. Thorax beneath at least partly yellowish testaceous ; head also usually more 



or less marked with yellowish 16 



Thorax not yellowish beneath ; head without yellowish markings except some- 

 times narrowly around mouth 15 



15. Head and thorax densely and closely punctate, dull black with little or no 



metallic tinge; hind femur broad, hind tibia also compressed and moder- 

 ately broad "J"- opaca, new species 



Head and thor.ix densely punctate but punctures shallower, with a distinct 

 metallic tinge esi^ecially on face and frons; hind femur and tibia not so 

 Uvoad 9. picea (Howard) 



16. Posterior ocelli about diameter of an ocellus in front of occipital trunca- 



tion 1*^ 



Posterior ocelli about twice diameter of an ocellus in front of occipital 

 truncation 18 



17. Basal cell of forewhig uniformly ciliated ; whole dorsum of thorax dull dark 



gi-een and mesopleuron and metapleuron more or less infuscated or aene- 



