206 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



surface; prescutum subopaque; scutum sliining; stigma broader at 

 base, gradually tapering at apex; transverse radius strongly curved, 

 leaving the stigma at the apex and joining the radius, almost inter- 

 stitial with the third transverse cubitus; third (second) cubital cell 

 longer than its apical width, about one and one-half times broader 

 apically; sheath straight above, oblique from the apex to near the 

 base when it becomes nearly straight. Black; anterior tibiae in front 

 and a small line at the knees of the intermediate legs pale piceous 

 wings hyaline, iridescent, venation black. 



Lancaster, New York. Described from one female collected June 

 2, 1912, by M. C. Van Duzee, for whom the species is named. 



Type.— Cat. No. 18378, U. S. N. M. 



Genus DIMORPHOPTERYX Ashmead. 



DIMORPHOPTERYX COLORADENSIS, new species. 



This species is more closely aUied to DimorpTiopteryx melanognatJius 

 than any other described species. It may be separated from mela- 

 nognatlius by the yellow labrum, more sharply angulate emargma- 

 tion of the clypeus, better defined ocellar basin and the more robust 

 sheath. 



Female. — Length, 8 mm. Labrum broadly rounded; clypeus flat 

 without a depressed apical edge, apical margm with a deep, broad 

 V-shaped emargination, the lobes broad, triangidar, m outline shaped 

 as the shape of the emargination; supraclypeal foveae elongate, 

 deeply, indistinctly connected with the antennal foveae; supra- 

 clypeal area small, convex ; antennal furrows poorly defhied ; middle 

 fovea obsolete; ocellar basm well defined above but with the walls 

 obsolete below; postocellar area well defined laterally, anterior 

 margin well defined by the postocellar furrow, narrowmg anteriorly; 

 the cephalo-caudad length subequal with the posterior width; the 

 posterior margin raised into two elongate transverse tubercles; 

 head shining; the ocellar and antennal areas punctured; posterior 

 orbits and vertex shming, with very few punctures; prescutum and 

 scutum shining; prescutum anteriorly with a few large punctures; 

 mesepisternum closely punctato-reticulate above; stigma broadly 

 rounded below, the apical margin truncate; transvei-se radius joinmg 

 the third cubital cell slightly beyond the middle; third cubital cell 

 on the radius subequal with the first and second; the third trans- 

 verse radius arched inwardly; sheath robust, slightly concave above, 

 subtruncate at the apex then broadly oblique to the subparallel 

 basal portion. Black; labrum, spot on the mandibles, tegulae and 

 four anterior legs, stramineous; antennae beyond the third joint rufo- 

 piceous; second to fourth inclusive abdominal segments, the poste- 

 rior femora and tibiae except apices rufous; posterior trochanters 



