NjORTH AMERICAN TETRASTICHUS BURKS 593 



Female. — Length, 1.1-1.3 mm. Antennae inserted at level of ven- 

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

 ventral margin of anterior ocellus; all funicle segments subequal in 

 length; club as long as first two funicle segments combined; length 

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

 twice as long as ocellocular. Mesopraescutum as wide as long and 

 bearing one row of bristles at each lateral margin ; submarginal vein 

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

 times as long as stigmal vein; apex of hindwing blunt, fringe at 

 posterior margin one-fourth width of wing at hamuli. Surface of 

 propodeum smooth, paraspiracular carinae wanting; mesal length of 

 propodeum one-third length of mesoscutellum ; propodeal spiracles 

 contiguous with anterior margin; gaster short, globose, one-third 

 longer than thorax. 



Male. — Length, 0.8 mm. Scape with darkened anterior carina 

 short, located near apex; pedicel one-fifth longer than first funicle 

 segment, second to fourth segments equal and each twice as long as 

 first segment, funicle segments enlarged near bases and bearing long 

 setae ; club as long as last two funicle segments ; gaster and thorax 

 equal in length. 



Type locality. — Jacksonville, Fla. 



Types.— U.S.N.M. No. 25953. 



Hosts. — Jumping bullet gall, Neurotenis saltarius Weld, on Querent 

 undulata; Neuroterus rileyi Bassett on Quercus stellata; also a series 

 was said to have come from peppergrass seeds, but that record is 

 probably incorrect. The host name mentioned for this species in the 

 original description, Neuroterus atomus Ashmead, is a nomen nudum. 



Distribution. — District of Columbia, Florida, Illinois, Missouri, 

 New York, Virginia. 



TETRASTICHUS SILVATICUS Gahan 



Tetrastichus silvaticus Gahan, Proc. Ent. Soc. Washington, vol. 39, p. 266, 

 1937.— Hodson, Ann. Ent. Soc. Amer., vol. 32, p. 131, 1939 (sylvaticus). 



Black, noniridescent ; variable areas on pedicel and basal segments 

 of flagellum, trochanters, bases and apices of femora and tibiae, and 

 basal segments of tarsi light yellow or white. 



Female. — Length, 1.1 mm. Antennae inserted at level of ventral 

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

 ocellus; first funicle segment one-third shorter than pedicel and one- 

 sixth longer than second segment, second and third equal in length; 

 club as long as second and third funicle segments combined ; length 

 of malar space one-half as great as height of compound eye; post- 

 ocellar line twice as long as ocellocular. Mesopraescutum wider than 

 long, provided with one row of bristles at each lateral margin ; sub- 

 marginal vein of forewing with two or three dorsal bristles ; marginal 



