NORTH AMERICAN TETRASTICHUS — BURKS 517 



iridescent green or bine-green sheen, but dorsum of thorax always with a 

 distinct bright-colored sheen, and never dull brown or black or shining, 



jet black 71 



Body yellow, brown or black, noniridescent 80 



71. First funicle segment elongate, from one and two-fifths to one and one-half 



times as long as second segment (fig. 16, d) ; mesal length of propodeuin 

 one-sixth as great as length of mesoscntellum ; antennae inserted slightly 

 dorsad of level of ventral margins of compound eyes; legs distad of coxae 

 almost always entirely light yellow or white, metafemora occasionally 



darkened on basal half carinatus Forbes (p. 5S3) 



Not having that combination of characters 72 



72. Body bright, iridescent blue-green ; frons iridescent purple ; apex of scape 



almost reaching level of vertex; abdomen acute at apex and elongate, almost 



twice as long as thorax repulsus Girault (p. 5S4) 



Face not iridescent purple 73 



73. Body iridescent blue; gaster equal in length to thorax, and these tagmata 



equal in width ; submarginal vein of forewing with two dorsal bristles ; 

 antennae unusually short, the funicle segments becoming progressively 

 broader and shorter toward apex, much as in fig. 16, f. 



malophilus, new species (p. 585) 

 Not having that combination of characters 74 



74. Spiracles almost or quite contiguous with anterior margin of propodeum, 



as in fig. 21, f 75 



Spiracles separated from anterior margin of propodeum by a space at least 

 one-half as great as length of a spiracle, as in fig. 21, a, c, e 76 



75. Thorax bright, iridescent blue ; marginal vein of forewing only slightly more 



than twice as long as stigmal vein bruchophagi Gahan (p. 585) 



Thorax brown, with a rather faint blue luster ; marginal vein of forewing three 

 and one-half times as long as stigmal vein. 



marcovitchi (Crawford) (p. 586) 



76. Propodeum long ; its mesal length more than one-fourth as great as length of 



mesoscutellum 7< 



Propodeum shorter ; its mesal length only one-fifth or one-sixth as great as 

 length of mesoscutellum 7S 



77. Body bright, iridescent green or blue-green; anterior tibiae tan or brown, 



usually slightly darker than middle and hind tibiae ; antennal scape mostly 



olack rapo (Walker) (p. 387) 



Body brown with rather faint green iridescent sheen; all tibiae white or 

 yellow ; antennal scape almost entirely light yellowish or white. 



microrhopalae Ashmead (p. 588) 



78. Body dark, iridescent blue; antennal scape short, its apex not reaching level 



of anterior ocellus, club longer than two distal funicle segments combined. 



chlamytis Ashmead (p. 589) 



Body dark brown or black with rather faint iridescent blue or blue-green 



sheen; apex of antennal scape reaching level of anterior ocellus, club as 



long as two distal funicle segments combined 79 



79 Head and body faintly iridescent blue-green ; mesopraescutum with one row 



of bristles at each lateral margin gerstaeckeriae Gahan (p. 590) 



Head and body iridescent blue or blue-green with faint purplish cast ; meso- 

 praescutum with two rows of bristles at each lateral margin. 



rugglesi Rohwer (p. 590) 



