NORTH AMERICAN TETRASTICHUS BURKS 597 



Type locality. — Cincinnati, Ohio. 

 Types— -U.S.N.M. No. 56258. 



Host. — Grass midge, Asteromyia agrostis (Osten Sacken), on 

 Muhlenbergia and Distichlis. 

 Distribution. — Ohio. 



TETRASTICHUS JUNIPERI (Crawford) 



Geniocerus juniperi Crawford, Proc. U. S. Nat. Mus., vol. 48, p. 585, 1915. — 

 Makcovitch, Ann. Ent. Soc. Amer., vol. 8, p. 169, 1915. — Leonabd, New York 

 (Cornell) Agr. Exp. Stat. Mem. 101, p. 984, 1928. 



(?) Epitetrastichus silvae Gieault, in Felt, New York State Mus. Bull. 200, 

 p. 21, 1917 (manuscript name). 



This species differs from T. marylandensis (Giraitlt), redescribed 

 on p. 598, only in having the apex of the antennal scape reaching the 

 level of the dorsal margin of the anterior ocellus, the first funicle seg- 

 ment one and one-third times as long as the second, and the propodeum 

 one-fourth as long as the mesoscutellum, rather than only one-fifth 

 as long. 



Type locality. — Ithaca, N. Y. 



Types.— V.S.NM. No. 18381. 



Host. — T. junipeH was originally thought to be phytophagous and 

 develop in juniper berries. This species is more likely to be para- 

 sitic an some midge larvae or Anthonomus funiperinus Sanborn, which 

 develop in the juniper berries. 



Distribution. — New York, Oregon. 



TETRASTICHUS IMPEXUS Girault 



Tetrastichus impexus Giratjlt, New chalcid flies, p. 2, 1917. 



Dark brown, noniridescent ; mouthparts and area on head imme- 

 diately around them, bases and apices of femora and tibiae, and 

 mesal area of postscutellum yellow. 



Female. — Length, 2.2 mm. Apex of scape not reaching level of 

 anterior ocellus; first funicle segment as long as pedicel, second seg- 

 ment slightly longer than first, third as long as first, club as long 

 as pedicel and first funicle segment combined; mesopraescutum as 

 long as wide and bearing one row of bristles at each lateral margin ; 

 marginal vein of forewing with three or four dorsal bristles; mesal 

 length of propodeum one-third as great as length of mesoscutellum ; 

 spiracles contiguous with anterior margin, paraspiracular carinae 

 wanting; gaster one-third longer than thorax. 



Male. — Unknown. 



Type locality. — Falls Church, Va. 



Type. — U.S.N.M. No. 21066. (Specimen in poor condition.) 



