NORTH AMERICAN TETRASTICHUS — BURKS 511 



or four long bristles ; apices of ovipositor sheaths usually just reaching apex 

 of abdomen, occasionally not quite reaching apex. 



johnsoni Ashmead (p. 526) 

 Not having that combination of characters 4 



4. Apices of sheaths and ovipositor, when in repose, not reaching apex of 



abdomen, as in fig. 21, i 5 



Apices of sheaths and ovipositor, when in repose, reaching or slightly exceed- 

 ing apex of abdomen, as in fig. 21, h H 



5. Marginal and stigmal veins of forewing almost equal in length, the latter 



nearly three-quarters as long as the former lissus, new species (p. 527) 



Marginal vein at least twice as long as stigmal vein 6 



6. Mesopraescutum with two or three rows of bristles at each lateral margin ; 



dorsal surface of thorax dull, and with dense, well-marked scalelike retic- 

 ulations ichthyus, new species (p. 528) 



Mesopraescutum with only one row of bristles at each lateral margin ; dorsal 

 surface of thorax rather shining, and with shallow scalelike reticulations, 

 or lacking such sculpture entirely T 



7. Thorax black or brown, noniridescent 8 



Thorax bright, iridescent green or blue-green 10 



8. Metatibiae partly dark brown or black melanis, new species (p. 529) 



Metatibiae entirely light yellow or white 9 



9. Femora partly brown; stigmal vein of forewing short, subsessile, as in 



fie. 20, b) brevistigma Gahan (p. 530) 



Femora entirely light yellow or white ; stigmal vein of forewing long, as in fig. 

 20, a pandora, new species (p. 530) 



10. Antennal club twice as long as third funicle segment ; third funicle segment 



nearly twice as long as broad ; scape almost always yellow ; mandibles and 

 mouth opening reduced in size (fig. 17, a )__ hylotomae (Ashmead) (p. 531) 

 Antennal club two and one-half times as long as third funicle segment; third 

 funicle segment only slightly longer than broad ; scape almost always brown ; 

 mandibles and mouth opening large (fig. 17, b) __asparagi Crawford (p. 532) 



11. Mesopraescutum with only one bristle at each lateral margin (fig. IS. d, e)— 12 



18, d, e) 12 



Mesopraescutum with two or more bristles at each lateral margin, or with 

 one to several rows of bristles at each lateral margin, or with bristles 

 distributed over entire sclerite. as in figs. 17, b, c; 18, a-e 19 



12. Anterior pair of scutellar bristles longer than posterior pair (fig. 18, e) ; 



thorax black or brown, marked with yellow, sometimes almost entirely 



black flora (Girault) (p. 533) 



All scutellar bristles equal in length or posterior pair longer; thorax never 

 yellow and brown ; either iridescent blue or green, or entirely dark brown 

 or black 13 



13. Thorax iridescent green hillmeadia (Girault) (p. 534) 



Thorax very dark brown or black, noniridescent 14 



14. Gaster entirely dark brown, or mostly dark brown with base tan. 



solidaginis, new species (p. 534) 

 Gaster partly or almost entirely white 15 



15. Abdomen almost entirely white; brown only along dorsolateral margins— 18 

 Abdomen white only at base IS 



16. First and second funicle segments equal in length. 



pulchriventris (Girault) (p. 535) 

 Second funicle segment longer than first 17 



17. All femora white ulysses (Girault) (p. 536) 



Front and mid femora partly brown__semilongifasciatus (Girault) (p. 536) 



