578 William T. M. Forbes 



The male variety feminalis Dyar, is dark gray, with obscure markings, much 

 like the female; the female variety masculinalis Dyar is white with only traces 

 of dark markings; the female is rarely brown, and often has a pale costa. 



III. Larva as in the last group, but with one less filament on anterior 

 than on posterior infrastigmatal gills; pupa as before. Imago with palpi 

 merely rough-scaled; Sc and R of hind wing fused decidedly more than half- 

 way to apex; the free part of Sc not more than half as long as R and some- 

 times very short; apex of hind wing more or less distinctly truncate. Ante- 

 medial line of hind wing strongly oblique, parallel to postmedial line, cutting 

 across end of cell. (Parapoynx, Oligostigma. ) 



6. N. seminealis Guenee. Male whitish, powdered with dark brown, giving a 

 chocolate brown effect. Outer line broad, even and white, strongly contrasting, 

 nearly straight from costa to fold, then turning inward almost to middle of 

 wing; preceded by an equally wide band of brilliant bronze. Subterminal space 

 bronze, terminal space tawny; subterminal line grayish white and black. Female 

 similar, but less brilliantly bronzy; postmedial line gray, inconspicuous. Hind 

 wing with a narrow inner and broader outer line, and a bronzy band; several 

 small black marginal dots in a group, below apex. 20-30 mm. 



The caterpillar feeds on Limnanthemum, and perhaps Potamogeton. In the 

 second stage it forms a trumpet-shaped mine on the lower surface of the leaf; 

 and then has simple gills; the number of filaments gradually increasing to four 

 in the last stage. The caterpillar eats more or less of the parenchyma within 

 the case. This species doubtfully distinct from the South American N. juncealis 

 Guenee. 



Massachusetts to Florida. 



7. N. obscuralis Grote. Ground color whitish, powdered with black -brown, 

 as in the male of N. seminealis, but much less brilliant, the powdering forming a 

 darker median shade; postmedial line white, narrow in female, broader in male, 

 more or less toothed in, below cell in female, and often obsolete below M 3 . Sub- 

 terminal space a little warmer brown, hardly contrasting. Hind wing marked 

 as in N. seminealis, but entirely without bronze reflections; the black marginal 

 points not emphasized below the truncation. 20-38 mm. (H 48:10.) 



Caterpillar with a maximum of six gill-filaments; on Potamogeton and Val- 

 lisneria. 



Generally distributed. New York: Waddington, Potter Swamp (Yates County), 

 Ithaca. 



8. N. badiusalis Walker. White; base of costa blackish; a short oblique dark 

 antemedial band; a postmedial band running from costa two-thirds way out, 

 perpendicularly down to Cu, then in along lower edge of cell to before middle of 

 wing, and obliquely into inner margin; the band grayish, normally partly filled 

 with yellow. Subterminal band yellow, edged with brown, roughly parallel to 

 outer margin, running almost to inner margin, then turning in along the inner 

 margin a quarter way to the base; marginal band yellow, edged within with 

 brown; fringe pale. Hind wing with parallel antemedial, subterminal, and terminal 

 bands, of nearly equal width, the two outer heavily filled with yellow. Male 

 usually smaller, the subterminal band of both wings usually black, emphasized 

 and contrasting; only the marginal band yellow. 15-20 mm. (albalis Robinson). 



Moth in August. Early stages unknown. 

 Common north of West Virginia and Illinois. 



New York: Saranac Lake, Waddington, Lake Bluff, North Fairhaven, Buffalo, 

 Hemlock Lake, Ithaca, Fvhinebeck, Ulster County ( Dyar ) . 



9. N. allionealis Walker, race itealis Walker. Fore wing white to luteous, with 

 fine fragmentary black markings; hind wing white or slightly shaded with lute- 



