86 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Anti'iniii' lO-joiiited, filiform <»r sli<ihtly subclavate, inserted low 

 down on tlic face, Just above the clypeus; tlie scai)e about half the 

 length of the head, sb'j^htly thickened and more tlian twice as lonj»- as 

 the pedieel; the first tlajiellar Joint usually peatly lenjjthened. 



Maxillary palpi Ion;;, (»-Jointed; labial i)al[»i very short, 2-Jointed. 



Mandibles 3-dentate. 



Thorax elon<>ated; the prothorax very long, separated from the 

 mesothorax by a strong constricth)n, above convex, anteriorly rounded; 

 mesothorax broader than long, shorter than theprotliorax, and usually 

 without parapsidal furrows; the scutellum distinct; metathorax sub- 

 (piadrate, more or less rounded olf i)osteriorly, rugose. 



Front wings with a large stigma, two basal cells and an incomplete 

 marginal cell. 



Abdomen oblong oval or oblong ovate, petiolate, tlie second and 

 third segments the largest, of which the sj'cond is the longer. 



Legs long, the femora obclavate, the tibiie long, slender, the anterior 

 tarsi chelate; in i anterior tarsi l<»ng, simple. 



Only three species in this genus arc known in our fauna, which may 

 be recognized by the aid of the following table: 



TAHLE OF SPECIES. 



FEMALKS. 



Not, entirely hrownish-yellow 2 



Ell tin' ly brownish-yellow. 



Winjis with two fii.seons bands I ». bikasci ATI's, Say. 



WinjfH fuHeiius, with a lar);<' roniMled hyaline spot IxMieath th»( Hti^^nia. 



D. ALATIS, ("r. 

 2. Abtlonieu shiniuf? ]>laek. 



Winj^s hyaline with two fiiscons bantls I>. amkuicaxis Ashni. 



D. bifasciatUB Say. 



Lcc, Ed. Say's Works, i, p. .S84, 9 i Ashni. Ent. Am., iii,i>. 71 ; Cresa. Syn. Hyni.,p. 24<J. 



Yellowish; Avings liifaseiate. 

 Inhabits Indiana. 



Body liouey-yellow, varied with blackish; .-interior thi;;hs dilated; win>?s with 

 two fnscons bands, th<>. a))ical one broader. 



Length rather more than one-lifth <»fan ineh. (>V<(i/.) 



Unknown to nic. 



Dryinus alatus Cr. 



Gonatopus f alnliis Cr., Trans. Am. Ent. Soe., n , \t. 19,3, 9 • Dryinus alntiiit Pat- 

 ton, Can. Ent., xi, p. 05; Ashni. Ent. Am., p. 246; Cress. Syu. Hym., jt. 246. 



9 . Length S.TS""". Pale femiginons, head shining, much broader tliau thorax, 

 transversely compressed; front tlat; eyes large, prominent, ovate; clypeus transverse, 

 subcon\ex, bitubereulate at tips; mandibles and scape beneith whitish ; antt^nna; 

 slender, as long as head and thorax, 10-joiuted, iirst joint short an<l robust, second 

 small, scarcely half the length of first, third very long and slender, more thau twice 



