142 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



First four or five joints antennae reddish the rest black; base of femora reddish; 

 wings hyaline, tinged with reddish. Mexico . . subvirescens (Cresson) 



10. At least some of legs rufous 11 



Legs all black or bluish 46 



11. Coxae, trochanters and body black, at least posterior femora rufous (abdomen 



may have faint violaceous reflection) 12 



Coxae, trochanters, and body not all black 18 



12. Forelegs and middle legs completely black, only posterior femora reddish, 



their knees black; head and mesonotum finely punctured; abdomen shining 



impunctate 13 



Middle and posterior legs both at least partly rufous 14 



13. Eyes distinctly converging below; a smooth shining, finely transversely stri- 



ated band at base of propodeum; apical segment of abdomen shining, 

 bearing some scattered punctures, apex testaceous; apical joints of antennae 

 brownish beneath; length 9. mm. Panama .... gentilis (Cameron) 

 Eyes distinctly converging above, ratio of lower to upper interocular distance 

 is 18:16; no smooth shining, finely striated band at base of propodeum; 

 apical segment of abdomen, shining; without punctures, apex slightly 

 testaceous; apical joints of antennae hardly brownish beneath; length 12 

 mm. Costa Rica, Trinidad, Brazil, British Guiana . . comparatus (Smith) 



14. Forelegs completely black, middle and hind femora except base and apex 



reddish; clypeus, lower face, lower thorax and apical part of propodeum 

 densely white pubescent; head, thorax above, and propodeum with long 

 pale hair; all coxae hairy; basal and transverse veins in forewings nearly 

 interstitial and subdiscoidal in rear wings interstitial with the cubital vein; 



Barro Colorado Island, Costa Rica esmeraldus (Banks) 



Forefemora partly or wholly reddish 15 



15. Forefemora mostly black, only inside and apex reddish; wings hyaline, veins 



yellowish; ratio of third and fourth antennal joints is 16:14, third joint 



equal to vertex width; length 9.0 mm. Canal Zone . 50. dietzi, new species 



Forefemora completely rufous (forefemora may be black at base); wings 



hyaline, veins black 16 



16. Only femora rufous, all tibiae and tarsi deep black, as is the body; antennae 



with a narrow yellow band beneath from joints 6 to tip, black above; ratio 

 of lengths of third and fourth antennal joints is 19:12; about same length as 

 preceding but a heavier insect; length 11.0 mm. Barro Colorado Island. 



4. femur-rubrus, new species 



All femora completely rufous; head and thorax dull black, abdomen shining 



black 17 



17. Foretibiae and basitarsi of forelegs yellow, last two pairs tibiae and their 



tarsi all dark; antennae yellowish beneath, black above; ratio of length of 

 third and fourth antennal joints is 17:14; length 11.2 mm. Barro Colorado 



Island 23. nigricuhis, new species 



All tibiae and basal joint of all tarsi yellow; antennae only very slightly 

 yellowish on apical joints beneath, black above; ratio of lengths of third 

 and fourth antennal joints is 15:12; length 10-11 mm. Mexico. 



49. fulgidus, new species 



18. Trochanters red (at least some of them), coxae black or only forecoxae black 



or coxae partly fuscous 19 



Trochanters and coxae black or some shade of blue or green or some yellowish 

 but mostly dark-colored 26 



19. Only forecoxae black, rest of legs all reddish except apical tarsal joints; head, 



thorax, and abdomen black; clypeus, face, sides of pronotum, sides of 



