572 PROCEEDINGS OF THE NWTTOiNAIL MUSEUM vol. 93 



TETRASTICHUS SOBRIUS Gahan 



Tetrastiohus sobrius Gahan, Ann. Knt. Soc. Amer., vol. 12, p. 160, 1919. 



Body brown or black ; antennae, apices of femora, tibiae and basal 

 segments of tarsi light yellow or white; abdomen of male white at 

 base. 



Female. — Length, 1.5-2.0 mm. Antennae inserted at level of ven- 

 tral margins of compound eyes; apex of antennal scape reaching 

 level of ventral margin of anterior ocellus; first funicle segment 

 slightly longer than pedicel, second equal to pedicel in length, third 

 slightly shorter, each segment slightly wider than the one proximad 

 of it, club as long as second and third funicle segments combined; 

 ocellocular line one-half as long as postocellar. Mesopraescutum as 

 wide as long and bearing two rows of bristles at each lateral margin ; 

 submarginal vein of forewing with three or four dorsal bristles, mar- 

 ginal vein six times as long as stigmal ; both pairs of scutellar bristles 

 located posterior to middle of segment. Apex of hindwing blunt, 

 fringe at posterior margin one-fifth width of wing at hamuli. Sur- 

 face of propodeum slightly roughened, both median and paraspiracu- 

 lar carinae present; mesal length of propodeum one-sixth length of 

 mesoscutellum ; propodeal spiracles touching anterior margin, length 

 of spiracle equal to mesal length of propodeum ; gaster long, narrow, 

 and acutely pointed, twice as long as thorax. 



Male. — Length, 1.0-1.25 mm. Scape broad and bearing a short, 

 darkened anterior carina near apex, first funicle segment two-thirds 

 as long as pedicel, second segment twice as long as first, third and 

 fourth equal and each slightly longer than second, conspicuously long 

 setae borne on transverse dorsal elevations near bases of segments; 

 club as long as third and fourth funicle segments; gaster slightly 

 shorter than thorax. 



Type locality. — Tempe, Ariz. 



Types.— -U.S.N. M. No. 22300. 



Hosts. — Originally said to be a parasite of the alfalfa gall midge, 

 Asphondylia websteri Felt; additional material was reared from 

 flower galls on Senecio douglassi, probably made by Asphondylia 

 lea Felt. 



Distribution. — Arizona, California ; Russia. 



Remarks. — Specimens of a species of Tetrastiohus reared from 

 alfalfa in Russia were found to be the same as this species; European 

 authors may have referred to this species under some other name. 



TETRASTICHUS PUNCTATIFRONS (Giranlt), new combination 



Figukes 17, c; 19, a; 21, b 



Epitetrastichus punctatifrons Gieatilt, Proc. U. S. Nat. Mus. vol. 51, p. 128, 

 1916. 



