582 PROCEEDINGS' OF THE NATIONAL MUSEUM vol. 93 



TETRASTICHUS FAUSTUS, new species 



Black, with blue-green iridescence; usually entire scape and apex 

 of pedicel, apices of femora, tibiae, and basal segments of middle 

 and hind tarsi yellow or white ; tibiae may be slightly darkened near 

 base; teneral specimens have broad yellow areas bordering sutures 

 on dorsum of thorax ; postscutellum always somewhat lighter in color 

 than rest of thorax. 



Female. — Length, 1.5-1.7 mm. Antennae inserted at level of ven- 

 tral margins of compound eyes; apex of scape not reaching level of 

 ventral margin of anterior ocellus; first funicle segment as long as 

 pedicel and one and one-fifth times as long as second; third slightly 

 shorter than second and both wider than first, club as long as second 

 and third funicle segments combined ; length of malar space two- 

 thirds height of compound eye, malar suture curved just dorsad 

 of base of mandible; length of ocellocular line two-thirds as great 

 as postocellar. Mesopraescutum wider than long and bearing one 

 row of bristles at each lateral margin; submarginal vein of fore- 

 wing with four or five dorsal bristles; apex of hindwing blunt; en- 

 tire dorsum of thorax closely and evenly reticulated. Surface of 

 propodeum faintly reticulated, almost smooth, mesal length of pro- 

 podeum equal to that of metanotum and one-third as great as dorsal 

 length of mesoscutellum ; median carina only present; spiracles con- 

 tiguous with anterior margin of propodeum ; gaster elongate, acumi- 

 nate, one-third longer than thorax. 



Male. — Unknown. 



Type locality. — East shore, Flathead Lake, Mont. 



Types.— U.S.N.M. No. 56255. 



Described from the female holotype and 23 female paratypes reared 

 from the cherry maggot, Rhagoletis fausta (Osten Sacken), August 

 10, 1934, R. D. Eichman. Many of the type specimens are teneral. 



TETRASTICHUS HIBUS, new species 



Black or very dark brown, with faint iridescent sheen, base of gaster 

 somewhat lighter than thorax ; apex of pedicel, narrow areas at bases 

 and apices of femora and tibiae and three basal segments of middle 

 and hind tarsi light yellow or white. 



Female. — Length, 1.8-2.2 mm. Antennae inserted at level of ventral 

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

 margin of anterior ocellus; first funicle segment one and one-fourth 

 times as long as pedicel and one and one-third times as long as second 

 funicle segment, second and third segments equal in length, club 

 slightly shorter than second and third funicle segments combined; 

 length of malar space two-thirds as great as height of compound eye; 

 postocellar line one and one-half times as long as ocellocular. Pro- 



