20 



Tlioni.v. above, Mui.sli Mack, witli yellowish honlers to the te<;ulae 

 within. Undenieath, eyaueous, with a yellowish while s[)ol al the 

 side heueath and l)erore insertioii uf the wings. Abdomen long", 

 l)lnish hlack ahove, with the hind margin of the second l)asal seg- 

 ment showing a very narrow, distinct, yellowish white hand, which 

 does not obtain infcriorly below the stigma tal line; anal tnft con- 

 colorons. Beneath, cyaneous black, with a broader band on the 

 fonrtli segment not obtaining above. Legs blnish l)lack. the anteri or 

 femora narrowly lined with yellowish Avhite on their onter edge, 

 these scales extend ontwardly at the base of the tibiae which else- 

 where are Idnish l)lack; anterior tarsi with powdered yellowish white 

 scales. Middle til)iae and tarsi interrupted, with yellowish white 

 scales. Hind til)iae neatly interrn})ted with yellowish Avhite scales, at 

 the base of the tibiae s[)urs, and again more prominently on the 

 otherwise blnish ])l;ick tarsi; the til)iae show some powdery white 

 scales inwardly from the apex; of the joint to tlie first pair of spurs. 



Wings translucent or vitreous, almost entirely deprived of scales, 

 the tegument with a yellowish stain. The Idackish scales arc limit- 

 ted on the primaries to the extreme base of the wing, a narrow cos- 

 tal border, the usual transverse bar at the extremity of the discal 

 cell and the narrow edging of the external and internal margins. 

 The secondaries are wholly pellucid, and show merely a very narrow 

 terminal border continued to the base of the wing. Fringes short 

 and Idackish. Jk'ueath, as above, but the costal scales from the 

 l)ase outwards are wholly or shaded with yellowish white to the 

 discal bar, which, with the apical portion of the border, is black, 

 and shows ti narrow outer edging of yellowish white scales. Expanse 

 15 — 10 mil. Length of body 21 — 22 mil. BaJiitat Atlantic District. 

 (Penn., New York). The sexes resemlde each other. The male 

 antennae are provided with a double fringe of hairs beneath. The 

 female antennae are simple; in both sexes closely scaled. The more 

 purely vitreous wings and the spotted or narrowly banded legs give 

 this species a i)eculiarly strong hymenopteriform appearance, and 

 distinguishes it from any of our descril)ed North American species 

 of the genus. 



On the edge of the wings are three or four rows of superimposed 

 layers of scales, laid like shingles on a house and very evenly 

 reaching to the edge of the wing and covering the follicles into 

 which are inserted the long filiform scales which go to make up 

 the fringe of the wings. These follicles are l]-200o of an inch apart. 



