214 PROCEEDINGS OF THE XATIOXAL MUSEUM. vol.53. 



DEROSTENUS PALLIPES, new species. 



Female. — Length 1.4 mm. Differs from all described species by 

 having the legs, except their coxae, entirely white. Head, thorax, 

 and abdomen brilliant metallic green, the face below the middle 

 bright golden, with strong close sculpture, vertex nearlj'- smooth, 

 the occiput sculptured much like the face, eyes distinctly hairy ; scape 

 pale, flagellum black; mesonotum and scutellum strongly punctate, 

 the propodeum and dorsum of the abdomen smooth: wings hyaline, 

 with a stigmal cloud. In sculpture closest to D. jullowayi Crawford, 

 but readil}' separated by the color of the legs and the smooth ab- 

 domen. 



Type-locality. — College Park, Maryland. 



Tyjye.—Cfit. No. 20393, U.S.N.M. 



Host. — Phytomyza aquilegiae. 



One specunen reared by Mr. E. N. Cory, of the Maryland Ex- 

 perim.ent Station, from the above-named leaf miner in Columbine 

 {Aquilegia) . 



Subfamily Tetrastichinae. 



TETRASTICHUS AINSLIEI, new species. 



Female. — Length 1.35 mm. Face nearly smooth, with a ery faint 

 reticulations and a few small round obscure punctures on the vertex 

 and frons and along the inner eye margins; funicle joints subequal, 

 the first longer than the pedicel; club not thickened and about as 

 long as the second and third funicle joints combined, apparently two- 

 jointed, the second joint twice as long as the first and terminating 

 in a short spine; thorax with fine shallow lineolation, median groove 

 of the mesocutum present but not very distinct; mesopleura fainth' 

 reticulate; propodeum imiformly faintly sculptured with an indica- 

 tion of a median carina; submarginal vein of the fore wing with a 

 single stiff bristle on the dorsal side; abdomen above, with obscure 

 reticulate sculpture. Head, thorax, and apical two-thirds of the ab- 

 domen black; basal third or a little more of the abdomen, antennal 

 scape, and legs for the most part yellow; flagellum blackish, the 

 pedicel brownish; mandibles rufous; front coxae and basal half of 

 the median and hind pairs black; femora often more or less stained 

 with fuscous ; wings hyaline, the venation pale, 



Male. — Essentially like the female, except for the usual sexual 

 characters. 



Type-locality. — Elkpoint, South Dakota. 



Type.—C2X. No. 20394, U.S.N.M. 



