X2 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 6S 



of that species in the absence of black marks on the head and thorax 

 and in the pale stigma. 



Female. — Length, 6 mm. Apical margin of the labriim broadly- 

 rounded ; clypeus with the lateral angles broadly rounded ; supracly- 

 peal area gently con vexed, triangular in outline; supra clypeal foveae 

 confluent with the antennal foveae; frontal foveae elongate; frontal 

 crest prominent, unbroken; postocellar line a trifle shorter than the 

 ocellocular line; postocellar furrow wanting; postocellar area with 

 a distinct longitudinal, median furrow; vertical furrows complete, 

 well defined; head slightly narrowing behind the eyes; antenna 

 nearly as long as the body, the third joint a trifle shorter than the 

 fourth ; thorax shining, basal plates finely reticulate ; tergites smooth ; 

 stigma angttlate basally, gradually tapering to an acute apex; 

 second recurrent antefurcal by a distance nearly equal to the length 

 of the second intercubitus ; recurrentella antefurcal by half the length 

 of intercubitella ; sheath broad, straight above, narrowly rounded 

 at apex, rounding to a broad base; claws with a prominent inner 

 tooth. Uniformly pale-yellow (perhaps green in life) ; head, spot 

 on prescutum, elongate spots on scutum, with a distinct ferrugineous 

 tinge; antennae with a narrow black line above; wings hyaline, 

 strongly iridescent ; venation dark-brown ; costa, subcosta and stigma 

 sordid-white. 



Type-locality. — Kudia River, Amagu, Siberia. 



Described from a single female collected July, 1923, by T. D. A. 

 Cockerell. 



Type.— Cat. No. 27623, U.S.N.M. 



O 



