384 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



shorter but stouter; all joiuts beyoud monilitorui, j^radually increasing 

 iji size. Thorax subovate, smooth, shining, trapezoidally narrowed 

 anteriorly from the tegulte; mesonotnni about aS long as wide across 

 the base, the parapsidal furrows being distinct, the middle lol)e at base 

 being one-third shorter than at a[)ex; scutellum deeply foveated at 

 base; postscutellum short with a median carina; metanotum as long as 

 the scutellum, areolated. Wings hyaline, covered with a long pubes- 

 cence, the venation i)ale; the marginal Ncin is as long as the basal; the 

 postmargiual not at all developed ; the radial \ein small, the first ab- 

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

 is much longer, and extends forward i>arallel with the outer margin of 

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

 of the marginal cell. Legs pilose, the femora and tibiae strongly cla- 

 vate. Abdomen conic-ovate, the tip conically i)oiuted and curving 

 downwards; petiole scarcely twice as long as tliick. 



Habitat. — Arlington, Va. 



Type in Coll. Ashmead. 



It bears a close resemblance to PolypczaPergandei, aud without a 

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

 fused with that species. 



Subfamily X.— J )lArKJlN.li. 



Head globose^ or subglobose, rarely oblong. Ocelli 3, close t(>gether, 

 and triangularly arranged. Mandibles most Irecpiently short, obtuse, 

 bidentate at apex, rarely rostriform. Maxillary palpi 4- or 5- jointed; 

 labial pali)i 2-jointed. Antenna*, porrect, inserted on a frontal promi- 

 nence, in males 13- or 14-jointed, filiform, nodose vertici Hate or monili- 

 finin ; in females 12- or 13 jointed, and in a single case 14 Jointed, clavate. 

 Pronotum scarcely visible from above; mcsouotum rarely longer than 

 wide, and Avith or without furrows; scutellum most fretpiently convex, 

 and foveated at base; nu'tathorax short, emarginate. Front wings 

 strongly fringed, most frequently without distinct cellules, the marginal 

 uervurepunctiform or wanting; hind wings never with a basal cell, vein- 

 less. Apterous forms frequent. Abdomen sul>i»ctiolate, rari'ly with a 

 very long i>etioh', ovate, conic-ovate, or oblong-oval, compos<'d of 7 or <S 

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

 1, 2, 2, the middle and posterior i>airs usually weak; tarsi h»ng, slender, 

 o-Jointed, claws sinq)lc. 



This sublamily could <»nly be confounde*! with the lirlf/iiiia., l)ut the 

 2-joiiited labial ])ali)i, the absence of a cell in tln^ hind wings, and the 

 less distinctly veined front wings readily sepaiato it. The ha])itus, 

 except in a few genera, is also ([uite different; the frontal i)rominence 

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

 tinctly clavate, the venation in front wings (juite dilferent, while the 

 abdomen is, as a rule, less distinctly i)ointed, and most frequently with 

 a much shorter petiole. 



