384 BULLETIN 45, UNITED STATES NATIONAL MTSKIIM. 



sliortvr but stoiitci-; iill joints boyoiul iiioiiililoriii, yriidiially iiKicasinof 

 in size. Thorax siihnvate, smooth, shiiiinji', tiapt'zoi dally narrowed 

 anteriorly from the tefiuhe; mesonotum about aa lonj; as wide a<-ross 

 the base, the i)arai)sidal furrows being distinct, the middle lobe at base 

 beinj;' one-third shorter than at apex; seutellum deeply foveated at 

 base; p<tstscutellum sliort with a median carina; metanotum as lonp; as 

 the seutellum, areolated. Wings Jiyalinc, covered with a long pubes- 

 cence, the venation pale; the nuuginal Ncin is as long as the basal; the 

 postmarginal not at all deveh>ped; the ra<lial vein small, the Jirst ab- 

 scissa being scarcely twice as long as thick, while the second abscissa 

 is much longer, and extends forward parallel with tlui outer nuirgin of 

 the wing, leaving very little space, so that there is scarcely any trace 

 of the marginal cell. Legs pi los«', the femora and tibiic strongly cla- 

 vate. Abdomen conic ovate, the tip conieally ]»ointed and ciuving 

 downwards; petiole scarcely twice as long as thick. 



Habitat. — Arlington, Va. 



Type in Coll. Ashmead. 



It bears a close resemblance to Polypcza 1 'ergon (hi, '.nu\ w\t\i(mt a 

 careful examination for the cell in the hind wing could easily be con- 

 fused with that species. 



Subfamily X.— I )IAPlillN.E. 



Head globose or snbglobose, rarely oblong. Ocelli 3, close together, 

 and triangularly arranged. Mandibles most frecpicntly short, obtuse, 

 bidentate at apex, rarely rostriform. Maxillary palpi 4- or o-jointed; 

 labial paljd 2 jointed. Antenna' [)orrect, inseitcil on a frontal pr<)mi- 

 nenee, in males 1.J- or l4-jointed, filiform, nodose verticillate or monili- 

 foim; in femalesl2-or 13-Jointed, andina single case I4-Jointed, t'lavate. 

 Pronotum s<*arcely visible from above; mesonotum rarely longer than 

 wide, and with or w'ithont furrows; seutellum most fre<iuently convex, 

 and foveated at base; metathorax short, emarginate. Front wings 

 str<mgly fringed, niost frecpieiitly without distinct cellules, the margiinil 

 nervure punctiiV>rm or wanting; hind wings never with a basal cell, vein- 

 less. Apterous forms frecpient. Abdcunen suV)petiolate, rarely Mitli a 

 very long petiole, ovate, conic-ovate, or oblong-oval, composed of 7 or 8 

 segments, the second always large. Legs clavate, the tibial spurs 

 1, 2, 2, the middle and posterior i>airs usually weak; tarsi long, slender, 

 5 jointed, claws simple. 



This subfamily could only be confounded with the Hrlytina; but the 

 2-jointed labial palpi, the absence of a cell in the hind wings, and the 

 less distinctly veined front wings readily separate it. The habitus, 

 except in a few genera, is also quite different; the frontal promiiience 

 is rarely so distinct, the antenme in the female are shorter, more dis- 

 tinctly clavate, the venation in front Avings quite different, while the 

 abdomen is, as a rule, less distinctly pointed, and most; frequently with 

 a much shorter petiole. 



