NORTH AMERICAN TETRASTIiCBUS BURKS 559 



third times as long as first funicle segment; postocellar line twice as 

 long as ocellocular, area of interocellar triangle with several short, 

 irregular, transverse rugae. Mesopraescutum with long bristles dis- 

 tributed over its entire surface in a rather haphazard manner; sub- 

 marginal vein of forewing with five dorsal bristles, marginal vein 

 three times as long as stigmal ; mesoscutellum with five pairs of bris- 

 tles on either side ; apex of hindwing blunt, fringe as posterior margin 

 one-third as wide as wing at hamuli. Surface of propodeum almost 

 smooth, paraspiracular carinae absent; mesoscutellum five times as 

 long as propodeum at meson ; gaster long, slender, more than twice as 

 long as thorax, and clothed with long bristles laterally and ventrally. 



Male. — Length, 1.5 mm. Scape with small darkened anterior ca- 

 rina near apex; pedicel narrow, but as long as first funicle segment, 

 second segment one and one-half times as long as first, three distal 

 segments each of the same length, fourth segment one-half as long as 

 club ; funicle segments bearing conspicuously long bristles on enlarge- 

 ments near bases; submarginal vein with four dorsal bristles; meso- 

 scutellum only two and one-half times as long as propodeum at meson ; 

 gaster sparsely clothed with bristles and only slightly longer than 

 thorax. 



Type locality, — Ames, Iowa. 



Types.— U.S.N.M. No. 56248. 



Described from the female holotype, male allotype, and 1 female 

 paratype, collected at Ames, Iowa, August 28, 1927. An additional 

 single female specimen, not included in the type series, was collected 

 at Arlington, Va. This last-mentioned specimen is in very poor 

 condition. 



TETRASTICHUS PHEGUS, new species 



Iridescent green or blue-green, with a distinct purplish cast, 

 especially on pronotum, scapulae, pleurae, and sternae; antennal scape, 

 ventral side of pedicel, bases and apices of femora, usually most of 

 tibiae, and basal three segments of middle and hind tarsi light yellow 

 or white; antennal flagellum, area of head around mouthparts, vari- 

 able, poorly defined areas near bases of tibiae, front tarsi, and apical 

 segment of middle and hind tarsi tan or light brown. 



Female. — Length, 1.9-2.1 mm. Antennae inserted slightly ventrad 

 of level of ventral margins of compound eyes ; apex of scape reaching 

 level of margin of anterior ocellus; pedicel and first and third 

 funicle segments each of the same length, second funicle segment 

 slightly longer, club twice as long as third funicle segment; length 

 of malar space two-thirds as great as height of compound eye ; posto- 

 cellar line twice as long as ocellocular; area of frons laterad and 

 dorsad of scrobe cavity with numerous short, erect bristles. Meso- 

 praescutum with two or three rather irregular rows of bristles at 



