562 PROCEEDINGS O'F THE NAfTTOiXiAl. MUSEUM vol. 93 



each lateral margin; submarginal vein of forewing with five or six 

 dorsal bristles; marginal vein three and one-half times as long as 

 st igmal vein ; prepectus reticulated, rest of mesopleuron almost smooth ; 

 apex of hindwing blunt, width of fringe at posterior margin one-fifth 

 as great as width of wing at hamuli. Surface of propodeum very 

 faintly reticulated, almost smooth; median carina almost entirely 

 obliterated, paraspiracular carinae wanting; mesal length of propo- 

 deum one-fifth as long as mesoscutellum ; propodeal spiracles separated 

 from anterior margin by a space almost as great as length of a spiracle; 

 gaster twice as long as thorax. 



Male. — Length, 1.4 mm. Darkened anterior carina of scape one-half 

 as long as scape; all four funicle segments equal in length and each 

 three-fourths as long as pedicel; segments of funicle approximately 

 quadrate and bearing relatively short setae; gaster one-third longer 

 than thorax. 



Type locality. — Yreka, Calif. 



Types.— U.S.N.M. No. 21064. 



Hosts. — The Pacific flathead borer, Chrysobothris m-ali Horn, in 

 Platanus racemosus ; the flat-headed apple tree borer, Ghrysobothris 

 femorata Olivier; Ghrysohothris spp. in various trees. 



Distribution. — California, Missouri, West Virginia. 



TETRASTICHUS MODESTUS Howard 



Tetrastich)/* modestus Howard, in Scudder, Butterflies of Eastern United States, 

 p. 1894, 1889.— Viereck, Connecticut State Geol. and Nat. Hist. Suit. Bull. 

 22, p. 453, 191G. 



Epitetrastichus mundicornis Girault, Chalcidoidea nova Marilandensis, pt. 3, 

 p. 1, 1917. (New synonymy.) 



Dark brown or black ; apices of femora and tibiae, and three proxi- 

 mal segments of tarsi white; antennae may be partly or entirely 

 yellowish. 



Female. — Length, 0.8-1.0 mm. Antennae inserted at level of ventral 

 margins of compound eyes; apex of scape reaching a point consider- 

 ably below level of anterior ocellus, pedicel one and three-quarters 

 times as long as first funicle segment, second and third segments 

 equal and each slightly longer than first, club as long as funicle; 

 malar space two-thirds height of compound eye ; postocellar line two 

 and one-half times as long as ocellocular. Mesothoracic spiracles oval, 

 only partly concealed by projecting angle of pronotum; mesoprae- 

 scutum slightly wider than long, surface entirely covered by long 

 bristles; submarginal vein of forewing with two or three dorsal 

 bristles; marginal vein three times as long as stigmal; hindwing 

 blunt at apex, marginal fringe one-third width of wing at hamuli; 

 anterior pair of scutellar bristles conspicuously long and located 



