92 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



shorter Init tliicktn'. The proiiotiim is Jiiuch narrower tliau the meso- 

 iiotuiu, altlumgli about as long; iiiesonotum with two furrows; sciitel- 

 lum bifoveated, the fovea^ widely separated but connected by a trans- 

 verse line; metathorax short, coarsely rugose, with some dorsal raised 

 lines. Wings hyaline, with a fuscous band across the marginal cell 

 two-thirds the Avidth of wing, almost devoid of pubescence; stigma 

 lanceolate; stigmal vein long curved; abdomen globose, black, petio- 

 lated, the petiole slender, rutbus, as long as the hind coxne, the second 

 and third segments very large, equal, occupying nearly the whole sur- 

 face, the following segments retracted. 



Habitat. — Manpiette, Mich. 



Type 9 in Coll. .Vshmead. 



Described from a single specimen captured by Mr. E. A. Schwarz. 



CHELOGYNUS Ilaliday. 



. Ent. Mag., i, p. 273 (1833). 



(Type C. fiiscicornis Dalm.) 



ITead transverse, the vertex broad, convex; the cheeks oblique, the 

 occiput not deeply concave, margined; ocelli 3 in a triangle, but 

 widely separated; eyes oval, subprominent. 



Antennae inserted just above the clypeus, lO-jointed, the first flagel- 

 lar joint scarcely as long as the scape, usually shorter, the following 

 joints short, in S the following joints lengthened. 



Maxillary palpi 5-jointed. 



Mandibles truncate at tips, 3- or 4-dentate; the teeth acute, slightly 

 subequal, the inner tooth the smallest. 



Thorax elongate; prothorax in 9 as long, or nearly as long, as the 

 mesonotum, snbquadrate, obliquely impressed at sides, in S very short; 

 mesonotum usually with two distinct furrows or indicated anteriorly; 

 metathorax long, r<mnded posteriorly. 



Front wings Avith a large ovate or subovate stigma, two basal cells 

 and a stigmal vein. 



Abdomen subpetiolate, ovate, the second segment the largest, the 

 others gradually subequal. 



Legs of moderate length, the femora obclavate, stout, the anterior 

 tarsi in the 9 chelate. 



The ovate stigma and the r)-jointed labial palpi sufficiently separate 

 this genus from Jiocchiis; and these characters, in connection with the 

 difference in the shape of the head and pronotuni, and the differences 

 to be pointed out in the chela3 distinguish it from DryiuKs; while the 

 longer pronotum, the H-jointed maxillary palj)!, and tlie differences in 

 the relative length of the anterior tarsal joints and the chehe can be 

 depended upon to separate it from Anteon. 



