NORTH AMERICAN TETRASTDCHJUS — BURKS 573 



Body black or very dark brown, with metallic-green reflections; 

 head metallic blue-green or purple; antennae, bases and apices of 

 femora and tibiae, and basal segments of tarsi white, light yellow, 

 or tan ; color of metatibiae variable ; abdomen paler brown at base ; 

 all setae borne by head and body set in conspicuous pits. 



Female. — Length, 2.0 mm. Antennae inserted at level of ventral 

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

 margins of anterior ocellus; scape two and one-half times as long as 

 pedicel, first funicle segment slightly shorter than pedicel, second 

 equal to pedicel, third as long as first, club as long as second and third 

 funicle segments combined; malar space two-thirds height of com- 

 pound eye ; postocellar line twice as long as ocellocular. Mesoprae- 

 scutum wider than long, two rows of bristles present at each lateral 

 margin, bristles arising from conspicuous pits (fig. 19, a) ; median 

 groove slightly broadened posteriorly; submarginal vein of forewing 

 with three to five dorsal bristles; apex of hindwing blunt, width of 

 fringe at posterior margin one-fourth as great as width of wing at 

 hamuli ; metacoxae deeply pitted. Surface of propodeum shagreened 

 (fig. 21, b) ; mesal length two-fifths as great as length of meso- 

 scutellum; both median and lateral carinae present; propodeal 

 spiracles contiguous with anterior margin ; gaster slightly longer than 

 thorax. 



Male. — Length, 1.6-1.8 mm. Scape bearing a short darkened 

 carina near apex, first funicle segment two-thirds as long as pedicel, 

 second almost twice as long as first, third and fourth each one-third 

 longer than second, funicle segments elongate, enlarged near bases, 

 and bearing conspicuously long setae, club as long as three apical 

 funicle segments; gaster slightly longer than thorax. 



Type locality. — Tempe, Ariz. 



Types.— U.S.N.M. No. 19644. 



Host. — Leaf miner in cottonwood (Popidus), probably Paraleu- 

 coptera albella (Chambers). 



Distribution. — Arizona. 



TETRASTICHUS BANKSII Howard 



Tetrastichus banksii Howabd, Proc. Ent. Soc. Washington, vol. 2, p. 299, 1892. 



Body brown; scape of antennae, apices of femora, tibiae, and tarsi 

 light yellow or white. 



Female. — Length, 1.9 mm. Frons strongly punctured laterad of 

 scrobe cavity ; antennae inserted at level of ventral margins of com- 

 pound eyes ; apex of scape not quite reaching level of anterior ocellus ; 

 first and second funicle segments equal in length; third segment 

 slightly shorter than second, club as long as pedicel and first funicle 

 segment; length of malar space two-thirds height of compound eye; 



