210 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



Cocoon of tlie normal nematine type, dark brown, covered with 

 white silk. 



Tijpe.—C&t. No. 18313, U.S.N.M. 



Genus PTERONIDEA Rohwer. 

 PTERONIDEA WINNANAE Rohwer. 



This species belongs to the group trilineatae as defined by Rohwer,^ 

 and in his table to the species runs it to trilineata Norton, but it may 

 be readUy distinguished from that species by the following synopsis 

 wliich should follow as Number Two coming from the place occupied 

 by trilineata in the above-mentioned table : 



2. Middle fovea triangulae in outliae; clypeus broadly, arcuately emarginate, the 



emargination broader than the lobes; hind tibiae all brown trilineata. 



Middle fovea elongate; clypeus narrowly emarginate, the emargination narrower 

 than the lobes; hind tibiae pale at base middletonia. 



The male runs in Marlatt's table to vancouverensis from which it 

 may be easily distinguished by the black perscutum. 



Female. — Length. 5.5 mm. Ocellar basin well defined, not extend- 

 ing beyond the posterior margin of the anterior ocellus; frontal crest 

 not broken; postocellar area poorly defined anteriorly, well defined 

 laterally by curved furrows ; postocellar line subequal with the oceU- 

 ocular line; third antennal joint noticeably shorter than the fourth; 

 stigma uniformly rounded below; third cubital cell nearly of equal 

 width, longer than its apical width; lower discal cell distinctly shorter 

 than upper; sheath broad, straight above, broadly rounded below; 

 teeth of the claws of equal length. Pale yellow; spot around the 

 oceUi, antennae, spot on the scutum and prescutum, apex of the 

 scutellum, metathorax, dorsal middle of abdomen, apex of the sheath, 

 extreme apices of the hind tibiae and the hind tarsi, black; wings 

 hyaline, iridescent, venation pale brown, stigma pale. 



Male. — Length 4.5 mm. Ocellar basin rather more sharply defined 

 than in the female; third cubital cell almost quadrate; hypopygidium 

 obtusely pointed; prodecentia slightly longer than the apical wddth, 

 strongly carinate, truncate apically with the angles rounded; other- 

 wise the male agrees in structure with the female. Black; head pale 

 except the area bounded by the antennal furrows; antennae black; 

 pronotum, tegulae, upper margin of the mesepisternum, venter, legs 

 except the apices of the posterior tibiae and the tarsi, pale yellow; 

 wings like the female. 



BaUston (Lacy), Mrginia. Redescription from one female and 

 thi'ec males recorded under Bureau of Entomology Number Hopk. 

 U.S. 11316?>, material collected, and reared September 9, 1912, by 

 WUliam Middleton. The larvae of this species feeds on Salix. 



' Proc. U. S. Nat. Mus., vol. 43, 1912,.p. 244. 



