86 BULLETIN 15, UNITED STATES NATIONAL MUSEUM. 



Antenna' lO-jointtMl, filiform or slightly Hubulavate, inserted low 

 down on the face, .just above the elypens; tlie scape about half the 

 length of the head, slij^htly thickened and more than twice as long as 

 the i^edicel; the first flagellar joint usually greatly lengthened. 



Maxillary palpi long, 0-jointed; labial palpi very short, 2-jointed. 



Mandibles 3-dentate. 



Thorax elongated; the prothorax very long, separated from the 

 mesothorax by a strong constriction, above convex, anteriorly rounded; 

 mesothorax broader than long, shorter than the prothorax, and usually 

 without parapsidal furrows; the scutellum distinct; metathorax sub- 

 quadrate, more or less rounded off j^osteriorly, lugose. 



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

 marginal cell. 



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

 third segments the largest, of which the second is the longer. 



Legs long, tlu^ femora obclavate, the tibite long, slender, the anterior 

 tarsi chelate; in i anterior tarsi long, simple. 



Only three species in this genus are known in our fauna, Mhich may 

 be recognized by the aid of the following table: 



TABLE OF SPECIES. 



FEMALKS. 



Not entirely brownish-yellow 2 



Entirely brown ish-yellow. 



Wiu>is with two fnfscous bands 1 ). hi kasciatcs, Say. 



Wings fuscons, with a laruc roiuideil hyaline spot l>eneath the stigma. 



D. ALATIS, Or. 

 2. Abdomen shininjr black. 



Wings hyaline with two t'liscoiis bands 1). ameiiicani's Ashni. 



D. bifasciatiis Say. 



Lee, Ed. Say's Works, i, \t. 3S4, 9 ; Aslmi. Ent. Am., iii, p. 71 ; ( Iress. Syn. Hym., p. 2Wt. 



Yellowish; Avings bifasciate. 

 Inhabits Indiana. 



Hody honey-yellow, v.aried with blackish; anterior tliighs dilated; wings with 

 two fnscons bands, the apical one broader. 



Length rather more th.an one-fifth of an inch. (Sai/.) 



Unknown to mc. 



Dryinus alatus Or. 



Gonatopus f aUitiis Or., Trans. Am. Ent. Soc, iv, p. 193, 9. Dnjhivs alatits Tat- 

 ton, Oan. Ent., xi, p. »).">; Ashm. Ent. Am., p. 246; Cress. Syn. Hym., p. 246. 



9 . Length .5.75""". Pale ferrnginons, head shining, much broader than thorax, 

 transversely compressed ; front Hat ; eyes large, prominent, ovate ; clypens transverse, 

 subconvex, bitnbercnlate at ti])8; mandibles and scape beneath whitish; antenna- 

 slender, as long as head and thorax, 10-joiuted, first joint short and robnst, second 

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



