594 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



vein three and one-half times as long as stigmal vein ; apex of hind- 

 wing blunt, width of fringe at posterior margin one-third as great 

 as width of wing at hamuli. Surface of propodeum faintly reti- 

 culated, sometimes smooth, paraspiracular carinae wanting; mesal 

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

 propodeal spiracles almost contiguous with anterior margin; gaster 

 one and one-third to one and one-half times as long as thorax. 



Male. — Length, 1.0 mm. Pedicel one-sixth longer than first funicle 

 segment ; second to fourth segments equal in length and each one-third 

 longer than first, funiele segments enlarged near bases and bearing 

 long setae; club as long as three distal funicle segments; gaster 

 slightly shorter than thorax. 



Type locality. — Ely, Minn. 



Types.— U.S.N.M. No. 52253. 



Host. — Eggs of the forest tent caterpillar, Malacosoma disstria 

 (Huebner). 



Distribution. — Minnesota, New Brunswick, Vermont. 



TETRASTICHUS NEBRASKENSIS (Girault), new combination 



Neomphaloidella nebraskensis Gibault, Can. Ent, vol. 48, p. 103, 1916. 



Usually entirely dull brown, sometimes almost black; area around 

 mouthparts, trochanters, bases and apices of femora, tibiae, and basal 

 segments of tarsi light yellow or white; metatibiae often partly 

 brown ; mesal area of postscutellum and base of abdomen usually yel- 

 low, always somewhat lighter in color than dorsum of thorax. 



Female. — Length, 1.5-1.8 mm. First funicle segment as long as 

 pedicel, second and third segments equal in length and each three- 

 fourths as long as first; club as long as first two funicle segments; 

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

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

 praescutum slightly wider than long and bearing one row of bristles 

 at each lateral margin; submarginal vein of forewing with from 

 three to five dorsal bristles; marginal vein three times as long as 

 stigmal vein ; hindwing blunt at apex, fringe at posterior margin one- 

 fourth as wide as wing at hamuli ; both pairs of mesoscutellar bristles 

 located posterior to midpoint of mesoscutellum. Surface of propo- 

 deum almost smooth; paraspiracular carinae wanting; mesal length 

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

 deal spiracles contiguous with anterior margin ; thorax two-thirds as 

 long as gaster. 



Male. — Unknown. 



Type locality. — Lincoln, Nebr. 



Types.— U.S.N.M. No. 19919. 



