NORTH AMERICAN TETRASTICHUS — BURKS 571 



base of gaster, darkened area on femora, entire front tarsi, and apical 

 segment of middle and hind tarsi brown ; usually entire scape, pedicel 

 and ventral side of first funicle segment of antenna, inner triangular 

 part of scapulae, bases and apices of femora, usually entire tibiae, 

 and basal three segments of middle and hind tarsi light yellow or 

 white. Inner side of tibiae, dorsal line on scape, and basal area of 

 pedicel may be somewhat darkened. 



Female. — Length, 1.5-2.2 mm. Area of frons dorsad and laterad 

 of scrobe cavity deeply punctured ; area immediately ventrad of an- 

 tennal bases shagreened ; fracture at ventral margin of compound eye 

 obscure, small; antennae inserted slightly dorsad of level of ven- 

 tral margins of compound eyes, apex of scape reaching level of 

 ventral margin of anterior ocellus; pedicel and first funicle segment 

 equal in length, second segment slightly shorter than first and third 

 slightly shorter than second, club one and one-half times as long as 

 first funicle segment, length of malar space one-half as great as height 

 of compound eye; postocellar line one and one-half times as long as 

 ocellocular line. Mesopraescutum bearing one row of bristles at each 

 lateral margin; submarginal vein of forewing bearing three or four 

 dorsal bristles, submarginal vein three and one-half times as long 

 as stigmal vein; posterior scutellar bristles located slightly nearer 

 lateral margin of sclerite than are anterior scutellars; apex of hind- 

 wing blunt, fringe at posterior margin one-fifth as great as width of 

 wing at hamuli. Surface of propodeum very faintly reticulated, 

 almost smooth, paraspiracular carinae wanting, postspiracular cari- 

 nae obscure ; spiracles contiguous with anterior margin of propodeum ; 

 gaster one and two-thirds to almost twice as long as thorax. 



Male. — Length, 1.5-1.9 mm. Scape with short darkened anterior 

 carina near apex; pedicel globose, slightly longer than first funicle 

 segment. Second segment one and two-thirds times as long as first, 

 third and fourth equal in length and each one and one-fourth times as 

 long as second, club slightly longer than two apical funicle segments 

 combined; funicle segments bearing conspicuously long bristles on 

 enlargements near bases of segments; marginal vein three times as 

 long as stigmal ; gaster as long as or slightly longer than thorax. 



Type locality. — Jenny Creek, Oreg. 



Types.— U.S.N.M. No. 56253. 



Described from the female holotype, male allotype, and 8 female 

 and 7 male paratypes reared from an unidentified lepidopteron in 

 the cones of Douglas fir, Pseudotsuga taonfolia, during 1938-1939, by 

 J. E. Patterson, under Hopkins U. S. No. 32333-C. 



Host. — The host of this species probably is Barbara colfaxiana 

 (Kearfott). 



