144 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



25. Antennae black above, slightly yellowish below at base; head bluish with 



purple reflection, dull, thorax greenish, abdomen with blue purple reflection, 

 dull; clypeus, face, and thorax with fine, prostrate, silver pubescence; 

 trochanters, femora, tibiae, and basitarsi of forelegs reddish j^ellow; middle 

 and posterior tibiae dark; ratio of length of third and fourth antennal joints 



is 14:11; length 11.0 mm. Panama 7. opacus, new species 



Antennae all black; face and clypeus black, front and vertex dull greenish; 

 pronotum, sides of thorax and from postscutellum to apex of propodeum 

 more or less bright greenish, especially the latter; the mesonotum and 

 scutellum black; abdomen black; face and clypeus with sorhe silvery pubes- 

 cence, the thorax with less and with a rather rough appearance with con- 

 siderable long light-colored hair; only the forepair of trochanters yellow, 

 the rest black; all femora, foretibiae, and forebasitarsi reddish yellow, rest 

 dark; antenna lost beyond third joint, length third joint 20 (same scale as 

 ratios in previous couplets); length 11.9 mm. Costa Rica. 



25. quartus, new species 



26. Coxae and trochanters dark, bluish; femora (except at apex) and apical joint 



of tarsi black; tibiae and tarsi yellowish, spurs blackish, yellowish at base, 

 and the posterior spur not reaching middle of metatarsal joint; eyes with 

 a distinct curve, converging a little at bottom; cheeks and clypeus covered 

 with dense silvery pubescence; pronotum angulate on posterior border; 

 abdomen shining; apical tergite shining, impunctate; antennae black, 

 pruinose; first recurrent received in middle of second cubital cell, the 

 second in basal third of third cubital cell; wings almost hyaline; length 



12 mm. Mexico montivagus (Cameron) 



Coxae and trochanters not bluish, or if so, legs not colored as above; at least 

 last two pairs femora reddish 27 



27. Abdomen black or with only the faintest trace of reflected colors (if in doubt 



consider abdomen black); at least metatarsal joint of foretarsi yellowish. 



28 

 Abdomen not black but with very noticeable reflected colors 32 



28. Basal half to three quarters of forefemora and base of last two pairs, black; 



metatarsal joint of middle legs also reddish yellow; larger species, legs in 

 particular thicker and longer; trochanters black, not yellowish at tip, the 

 black continuing onto the base of femora; antennae brown dorsally, yellow 

 ventrally; pubescence coarser, and or longer; length about 9.0 mm.; head 

 and mesonotum finely punctured; wings brownish, veins black; posterior 

 tibiae slightly reddish beneath. Mexico, Panama . . 9. zeteki, new species 

 All femora wholly rufous 29 



29. Foretarsi with only basal joint obscurely yellowish beneath; antennae 



blackish 30 



Foretarsi almost completely bright yellow; antennae bright yellow beneath, 

 brown above; last two pairs tarsi in certain reflected light completely dark, 

 in other light basal joint slightly dark reddish; sides of thorax as well as 

 dorsal surface a bright shining green, with no trace of blue or violet color; 

 wings hyaline, veins slightly yellowish in reflected light; length about 6.5 

 mm. Panama 10. panamensis, new .species 



30. Posterior tibiae black, or with a dark reddish cast in which case the tibiae 



appears black compared to the bright yellow femora and first two pairs of 



tibiae; antennae brown and yellowish beneath 31 



Posterior tibiae rufous as well as the other tibiae and femora; middle and pos- 

 terior metatarsal joints rufous beneath; antennae dark; sides of thorax 

 and propodeum with a definite bluish and violet coloration; wings hyaline, 



