280 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



Female.—Length 7.5 mm. Clypeus deeply, arcuately emarginate, 

 lobes subtruncate; supraclypeal area triangular in outline, strongly 

 convex; supraclypeal foveas deep, confluent with antennal foveas; 

 middle fovea circular in outline; walls sloping; crest sharply defined 

 centrally, not broken; oceUar basin U shaped, the legs shghtly 

 diverging toward the crest, V-d posteriorly; antennal furrows obso- 

 lete; shallow depressions laterally; postocellar furrow not sharply 

 defined; postocellar area not defined laterally; postocellar fine much 

 longer than the ocellocular; antennae tapering, third and fourtli 

 joints subequal; stigma short, rounded below; cerci long, tapering; 

 sheath broad, shghtly convex above, apex narrowly tinancate and 

 obliquely rounded to base; inner tooth of claws shorter than the 

 outer. Black; labrum, palpi, tegulae, coxae except above (basally), 

 trochanters, four anterior tibiae and tarsi (except black spot on apex 

 of median tibiae above), and basal third of hind tibiae, whitisli; angles 

 of the pronotum, and femora (except apex of hind pair) rufo-ferrugi- 

 nous; abdomen (except the two basal tergites), cerci and sheath 

 bright cherry red; wings hyaline, iridescent; venation, including 

 stdgma, black; costa yellowish. The above description of the color 

 is from a fresh specimen. 



Cabin John, Maryland. One female collected April 28, 1912, by 

 M. C. van Duzee. 



Type.— C&t. No. 14797, U.S.N.M. 



PTERONIDEA VANDUZEEI, new species. 



Related to Pteronidea mendica, but may be separated from this 

 species by the triangular-shaped middle fovea and low ocellar basin 



Female. — Length 5.5 mm. Clypeus angularly emarginate, lobes 

 rounded; supraclypeal foveae confluent with antennal foveae; supra- 

 clypeal area convex; middle fovea triangular, breaking through the 

 crest; antennal furrows sharply defined, biangulate; ocellar basin well 

 defined, triangular in outline, the base (which is the crest) being much 

 longer than the sides; depression behind the anterior ocellus V-shaped, 

 the legs of the V forming furrows behind the lateral wall of the ocellar 

 basin; postocellar furrow angulate anteriorly, not sharply defined; 

 postocellar area well defined, about two and a half times as wide as 

 the lateral length; postocellar line shorter than the ocellocular; third 

 antennal joint distinctly shorter than the fourth; stigma broader near 

 base, rounded below; sheath straight above, rounded from apex* 

 rather broad. Greenish (in life); palpi, apices of the mandibles, 

 antennae, area inside of antennal furrows above crest, mesonotum 

 except sutures, apex of scutellum, metanotum, abdomen centrally 

 above, and the tarsi, hlack; wmgs hyaline; venation black; stigma and 

 costa pallid. 



Chain Bridge, Virginia. One female collected April 26, 1912, by 

 M. C. van Duzee, for whom the species is named. 



Type.— Chi. No. 14796, U.S.N.M 



