312 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



icate but distinct posteriorly, in tbe 3 almost obliterated, tlie middle 

 lobe projecting slightly upon the scutellum. Scutellum very high, 

 transverse, convex. Metapleura subsericeous. Teguhe rutb-piceous. 

 Wings hyaline, pubescent. Legs dark brown to piceous, trochanters, 

 tips of anterior femora and tibia*, base of middle and posterior tibite, 

 and all tarsi brownish-yellow or honey-yellow, sometimes the poster 

 ior femora black. Abdomen in the .9 about is long as the bead and 

 thorax together, in S shorter; in both sexes, the petiole and the fove- 

 ola^ at base of the second segment striated. 



Hakitat. — Western States. 



Types in the Illinois State Laboratory of Natural History and 

 National Museum. 



This species seems to have been first reared by Dr. Riley, from spec- 

 imens of the Hessian tly {Cecidomyia destructor Say), August IG, 1870^ 

 received from Blair, Nebr. It has, however, since been bred from the 

 same tly, by viirious persons in the Western States. Prof. Forbes 

 reared it in 1888 at Chami)aign, III.; Prof. Cook, of Agricultural Col- 

 lege, Mich., in 1800; and Prof. Webster at Laporte, Ind., in 1889. 



I know of no specimens reared in the Eastern States. Can tbe 

 species be moving Eastward? 



Polygnotus prozimus, sp. nov. 



S $ . Length, 0.80 to 1.20"" . Black, polished ; head thrice as wide as 

 long nntero-posteriorly, the vertex posteriorly transversely aciculated, 

 the face polished. Mandibles piceous. Antennae 10-jointed, brown- 

 black, much slenderer than in J*, hicmalifi, the Hagellum slightly more 

 than tvice the length of the scape; pedicel long, cylindric, as long as 

 the first and second, funidar joints together; first funidar joint longer 

 than thick, whitish at base; second much longer and thicker; third 

 shorter than the second and constricted at ai)ex ; club 5-jointed, slender, 

 the joints neaily twice as long as thick, the last fusiform, longer than 

 the preceding. In the male the pedicel is oval, not quite as long as the 

 first and second fnniclar joints together; first funidar joint small, monili- 

 form; second larger, «lilated and truncate at tip; clnb 0-jointed, hairy, 

 the joints, except the last, moniliform, not longer than thick, slightly 

 l>edicellate, the last <'one-shaped, nearly twice as long as the preceding. 

 Thorax ovoid, polished, the mesonotal furrows indicated only poste- 

 riorly, the mi<ldle lobe projecting a little «m the base of the scutellum, 

 the ])arapsides at base Avith a tuft of pubescence. Scutellum high, 

 transverse, convex, with a little imbescence on either side i)osteriorly. 

 Metapleura sericeous. Tegula* bhuik. Wings hyaline, iridescent, pubes- 

 cent. Legs brownish-piceous, the anterior knees, tips of anterior tibijB 

 and all tarsi, honey-yellow. Abdomen in 9 pointed at tip, slightly 

 longer than the head and the thorax togetlier, in S oblong-oval, not 

 longer than the thorax, the petiole striated, the second segment with 



