NORTH AMERICAN TETRAST1CHUS — BURKS 513 



27. Thorax dark, iridescent blue-green or green ; propodeum weakly reticulated. 



xanthomelaenae (Rondani) (p. 544) 

 Thorax dull brown, noniridescent ; propodeum smooth. 



compsivorus Crawford (p. 545) 



28. Metafemora entirely light yellow or white 29 



Metafemora partly or almost entirely dark brown, black, or iridescent — 30 



29. Dorsum of thorax with greenish iridescence; outer surface of metacoxae 



strongly pitted euplectri Gahan (p. 540) 



Dorsum of thorax bright, iridescent blue-green ; outer surface of meta- 

 coxae with very weak and shallow indentations. 



aeneoviridis (Girault) (p. 547) 



30. Apex of hindwing acute, fringe at posterior margin one-half as wide as 



wing at hamuli, as in fig. 20, h 31 



Apex <>f hindwing blunt, fringe at posterior margin not more than one-third 

 as wide as wing at hamuli 32 



31. Second funicle segment slightly longer than first; mesal length of pro- 



podeum one-fifth as great as length of mesoscutellum. 



diarthronomyiae Gahan (p. 547) 

 First and second funicle segments equal in length; mesal length of pro- 

 podeum one-third as great as length of mesoscutellum. 



tibialis (Ashmead) (p. 548) 



32. Mesotibiae almost entirely dark brown scolyti Ashmead (p. 548) 



Mesotibiae entirely light yellow or white 33 



33. Sides of pronotum with a deep femoral groove (fig. 17, e) ; body deep, 



iridescent blue agrili Crawford (p. 549) 



Sides of pronotum without a femoral groove, as in fig. 17, d; body brown 

 or black with iridescent greenish or brassy cast, or iridescent green__ 34 



34. Apex of antennal scape reaching level of vertex ; thorax iridescent green. 



scriptus, new species (p. 550) 



Apex of antennal scape not surpassing level of ventral margin of anterior 



ocellus; thorax dark brown or black, with faint iridescent greenish or 



brassy cast °^ 



35. Antennal scape and pedicel uniformly brown ; body very dark brown, with 



faint greenish iridescence productus Riley (p. 550) 



Antennal scape and apex of pedicel light yellow or white, base of pedicel 

 brown ; body black or very dark brown with brassy cast. 



paracholus, new species (p. 551) 



36. Head considerably broader than pronotum ; entire dorsum of thorax covered 



by close, scalelike reticulations, as in fig. 18, c, and very dark steel-blue or 

 shining black (old or teneral specimens may be brown) ; entire surface of 



gaster shagreened 37 



Dorsum of thorax differently sculptured; surface of gaster usually not com- 

 pletely shagreened 38 



37. Marginal vein of forewing four to four and one-half times as long as 



stigmal ; funicle segments of antenna long, slender ; first segment three 



and one-half times as long as broad tesserus, new species (p. 552) 



Marginal vein of forewina only two and one-half to three times as long as 

 stigmal ; first funicle segment twice as long as broad. 



fumipennis (Girault) (p. 553) 



38. Body dark brown or black, sometimes with indistinct iridescent reflections, 



and with middle and hind coxae entirely light yellow or white 39 



Nor having that combination of colors : body and middle and hind coxae 

 either both yellow, or body brown, black, or iridescent with coxae partly 

 or entirely dark 40 



