622 William T. M. Forbes 



margin. Postmedial line pale, defined with dark, normal, with, a large dark patch 

 before it on inner margin. Hind wing paler. 20 mm. 



May; July and August. Larva black, with a yellow head; in a loose web con- 

 taining suspended frass, in a folded leaf of Nyssa. 



Southern New Jersey to western Pennsylvania. 



81. POLOPEUSTIS Ragonot 



Male antennae rough and obscurely dentate, pubescent; palpi relatively short, 

 upturned, not exceeding the vertex; first two joints long-hairy, the third short, 

 and cylindrical; maxillary palpi slender. Fore wing more triangular than usual, 

 with M 2 to Cu 2 free and parallel; hind wing with moderate cell (Cu 2 at two- 

 fifths), M 2 and M 3 very long-stalked, angle of discocellular between CUj and Cu 2 . 

 Moth diurnal. 



1. P. annulatella Zetterstedt. Black, dusted with white, appearing light gray; 

 lines pale, defined with dark, converging toward inner margin; antemedial line 

 nearly straight; postmedial irregular. Hind wings very pale brownish, darker in 

 female. Male 24, female 20 mm. 



Arctic Eurasia; Altai; Labrador (?). 



The Labrador specimen, determined as annulatella in the Hulst collection, is a 

 Nephopteryx, and apparently a small eastern race of N. fasciolella. 



82. AMBESA Grote 



Like Nephopteryx, male antennae flattened and slightly thickened at base, but 

 without the notch and tuft of scales. 



1. A. busckella Dyar. Powdery gray, slightly reddish, especially at base and on 

 thorax. Base pale, followed by a diffuse blackish band, wider on the inner margin, 

 the band lying before the antemedial line toward the inner margin and beyond it 

 at costa, sometimes obliterating it. Lines doubled, dentate, antemedial line fully 

 two-fifths way out, and farther out on inner margin; postmedial line well out, 

 normal, its blackish edging somewhat wider on costa. A black reniform, and some 

 blackish postmedial shading. Hind wing translucent at base. 22 mm. 

 July- 

 Maryland; western Pennsylvania. 



83. NEPHOPTERYX Hiibner 



Male antenna? simple or serrate, with a more or less developed curve in base 

 of shaft, filled with a mass of large scales. Front swollen, rough-scaled; palpi 

 upturned beyond vertex, normal, the maxillary palpi normal, or with a flat tuft of 

 scales applied to the face as in Ulophora. Wings smooth-scaled. Fore wing with 

 R 2 free in our species, M 2 and M ;! separate but rather approximate, not in line with 

 Cu. Hind wing with Sc and R closely parallel; Mj stalked, M 2 and M 3 stalked; 

 dcv of type 3b, becoming approximate to lower side of cell at or beyond origin of 

 Cu 2 , which is at two-fifths the length of the wing. Prothorax below with large 

 scales, as in Ambesa, but unlike Dioryctria. 



Key to the species 



1. Ground dusted with white on clear black, appearing bluish ash gray. 



2. Each scale with a white base and a fine white tip; apparently very finely 

 powdered 2. rhypodella. 



2. Most of the scales either wholly black or wholly white 1. ovalis. 



1. Ground fuscous, dusted with black, and broadly white-tipped, scales. 



