NORTH AMERICAN TETRASTICHUS — BURKS 561 



bases with minute, closely set transverse reticulations. Mesopraescu- 

 tum with two or three irregular rows of bristles at each lateral margin ; 

 submarginal vein of forewing with four or five dorsal bristles, marginal 

 vein twice as long as stigmal, latter usually weak near base ; mesoscutel- 

 lum bearing three pairs of bristles ; apex of hindwing blunt, fringe at 

 posterior margin one-seventh to one-eighth as wide as wing at hamuli. 

 Surface of propodeum shagreened, paraspiracular carinae present; 

 mesal length of mesoscutellum three and one-half times as great as 

 mesal length of propodeum ; spiracles separated from anterior margin 

 of propodeum by a space one-half as great as length of a spiracle; 

 gaster narrow, elongate, twice as long as thorax. 



Male. — Length, 2.0-3.0 mm. Darkened anterior carina of scape one- 

 half as long as scape ; pedicel slightly longer than first f unicle segment, 

 first and second segments equal in length, third and fourth equal in 

 length and each slightly longer than second; club two and one-half 

 times as long as fourth f unicle segment ; segments of antennal flagellum 

 without long bristles ; gaster one and one-half times as long as thorax. 



Type locality. — Stanford University, Palo Alto, Calif. 



Types.— U.S.N.M. No. 56250. 



Described from 47 female and 39 male specimens. Holotype female, 

 allotype male, and 8 female and 1 male paratypes from the type lo- 

 cality, reared from gall of Andricus calif ornicus Bassett, February 19, 

 1932, F. H. Sumner; 1 female paratype and 1 male paratype, Oregon 

 Mountain, Josephine County, Oreg., reared from gall of Andricus 

 calif amicus, November 17, 1927, H. A. Scullen ; and the following para- 

 types, all reared from Andricus calif ornicus by S. M. Dohanian, April 

 6-7, 1939 : 4 females, 4 males, Sacramento, Calif. ; 4 females, 4 males, 

 Washington County, Oreg. ; 4 females, 4 males, Benton County, Oreg. ; 

 8 females, 8 males, Marion County, Oreg. ; 8 females, 8 males, Eugene 

 and vicinity, Oreg.; 4 females, 4 males, Polk County, Oreg.; and 4 

 females, 4 males, Clark County, Wash. 



TETRASTICHUS HOLBEINI Giranlt 



Tetrastichus holbeini Girault, New chalcid flies, p. 2, 1917. 



Very dark brown or black with green or blue-green iridescence; 

 antennae, apices of femora, tibiae, and basal segments of tarsi light 

 yellow or white. 



Female. — Length, 2.0 mm. Antennae inserted ventrad of level of 

 ventral margins of compound eyes ; apex of scape not quite reaching 

 level of anterior ocellus; pedicel and first f unicle segment equal in 

 length, second and third segments equal in length and each four-fifths 

 as long as first ; club as long as first and second f unicle segments ; length 

 of malar space four-fifths as great as height of compound eye. Meso- 

 praescutum as long as wide and bearing one or two rows of bristles at 



