448 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



tangular, about half as broad as the emargination; supraclypeal area 

 flat; ocellar basin well defined by broad rounded walls sloping in- 

 wardly, elongate and confluent with the middle fovea, but deepest 

 immediately in front of the ocellus; area latrad of the antennal fur- 

 rows shining with widely scattered punctures; the postocellar furrow 

 well defined, slightly curved anteriorly; postocellar area about one- 

 fifth wider posteriorly, well defined; third antennal joint one- third 

 longer than the fourth; sculpture of the thorax normal; sheath straight 

 above, subtruncate apically, with the lower angle rounded. Black; 

 labrum, tegulae, scutellum, apices of coxae, trochanters, four an- 

 terior tibiae and tarsi, posterior tarsi whitish; abdomen beyond the 

 basal segments except the sheath, the posterior femora and tibiae 

 except the apex of the latter, castaneus; wings hyaline, iridescent, 

 venation dark brown. 



Male. — Length, 7 mm. Labrum obtusely rounded apically, cly- 

 peus flat as in the female; head and thorax as in the female; hypopyg- 

 ium broadly rounded apically. Colored as the female except the 

 scutellum is black; the apices of the posterior tibiae are hardly black. 



Falls Church, Virginia. Described from two females and three 

 males recorded under Bureau of Entomology Number Hopk. U. S. 

 101576,/, g, h. Material collected and reared by W. Middle ton and 

 the author. 



Type-specimen.— Cat. No. 18187, U.S.N.M. 



DIMORPHOPTERYX QUERCIVORA, new species. 



Male. — Length, 7 mm. Labrum strongly convex basally, apical 

 margin subtruncate; clypeus gently convex, broadly subsquarely 

 emarginate, lobes rectangular, about one-third as wide as the emar- 

 gination; supraclypeal area gently convex; ocellar basin rather well 

 defined by broad low walls, partly separated from the middle fovea; 

 if the separation were complete it would be trapezoidal; the area 

 latrad of the ocelli, the posterior orbits, the postocellar area with 

 large, well-defined, scattered punctures; antennal furrows complete; 

 postocellar furrow well defined; flagellum flat, second joint two- 

 thirds the length of the first; scutum with punctures rather more 

 dense than on the prescutum; punctures of the scutellum large; 

 hypopygium broadly rounded apically. Black; labrum, anterior 

 margin of clypeus, tegulae, spot on the scutellum, four anterior legs 

 below the apices of the coxae, apices of the posterior coxae, trochan- 

 ters yellowish white; abdomen beyond basal plates, posterior femora 

 and tibiae castaneus; posterior tarsi, except the base of the first joint, 

 pale ferruginous; wings hyaline, iridescent, venation black. 



Tomahawk Lake, Wisconsin. Described from one male recorded 

 under Bureau of Entomology Number Hopk. U. S. 10171, material 

 collected by S. A. Rohwer and reared by William Middleton. 



Type-specimen.— Cat. No. 18188, U.S.N.M. 



