NYSTALEA. By Dr. M. Draudt. 
909 
Type of genus: N. bidentata Wkr. 
N. bidentata Wkr. (143 e). This well-known, very characteristically coloured species the forewing of bidentata. 
which is grey at the inner margin, lighter silvery white towards the brown costal-marginal part, chiefly occurs 
in the northern and eastern parts of the U.S.A. and in Canada, and seems to be absent in the west. The larva 
is whitish bluish-green on the dorsum, darker beneath, with strong two-pointed dorsal humps which are turned 
forward and excellently protect the larva resting on its food-plant, the leaf of an elm-tree. 
12. Genus: Wystalea Gn. 
A very well characterized genus resembling the Cucullia, with long, narrow, pointed forewings. $ an¬ 
tennae more or less tuftedly ciliated, palpi rather short, very hairy, with long erect tufts of scale-hairs. Neura- 
tion chiefly like that of the neighbouring species, mainly distinguished from the preceding ones by only 7 and 
8 of fore wing being stalked and vein 6 generally arising near the proximal beginning of the accessory cell; 
the costal branch on the hindwing arises near the cell-end. — The larvae, as far as they are known, are exactly 
like those of the palaearctic Notodonta ( ziczac etc.). 
Type of genus: N. ebalea Or. 
N. julitha Schs. (143 e). Head and prothorax brownish-black, the rest of the body like the forewing -julitha. 
light wood-coloured, with the beginnings of double lines at the costal margin; cellular fold and veins behind 
the cell finely striped dark; a double angular line in the centre of the inner margin, and a fine streak at the 
cell-end; traces of a postmedian line and of an undulate line above the anal angle. Hindwing brownish-grey, 
darker at the margin. Expanse of wings: 60 mm. Brazil, Rio. 
N. ebalea Or. ( = conchyfera Gn.) (143 e) is the oldest and most widely distributed species known with ebalea. 
a wood-coloured brown forewing which is darkened deep blackish-brown in the costal-marginal part, especially 
towards the apex, with small light brown, darker centred spots in the centre of the costal margin and at the 
apex, indistinct deeply notched transverse lines, and a thick black dot above the centre of the inner margin. 
Hindwing diaphanous whitish, with darker veins and a blackish-brown marginal band. From Mexico to Brazil 
and Colombia. 
N. eutalanta Dyar is very similar to ebalea, somewhat smaller and of a more compact structure, the eutalanta. 
light costal-marginal spot is whitish and much larger so that it includes the reniform-macular spot, the marginal 
area is lighter. Described from Florida, in March. 
N. porgana Schs. (143 e), likewise allied to the two preceding species, has brown forewings, strewn porgana. 
darker brown and grey in the cell and on the veins, with indistinct double transverse lines and a large olive 
brown costal-marginal spot at the apex, enclosing a black streak and edged with white and reddish-yellow; 
the veins 4—6 are shaded with dark brown on both sides. Hindwing light brown, darker at the distal margin. 
From Guiana. 
N. parsoni Schs. (143 f) is smaller than the similar porgana and more variegated, the light apical spot parsoni. 
is longer and narrower. Forewing purple brown, inner margin and distal margin reddish-olive excepting the 
area between 4 and 6, the markings blackish-brown; a black and white streak on the base of the median vein, 
the three transverse lines double, filled with light reddish-brown; a long narrow reniform macula at the cell- 
end is reddish with black lines, a curved black line behind it with a brown spot at the submedian fold; the 
postmedian line is scaled white distally, a sinuate light brown line is behind it; subterminal red-brown lunules 
are white distally, small dark marginal spots above the anal angle. Hindwing brown, lighter towards the base. 
Expanse of wings: 65 mm. Bolivia. 
N. amatura Schs. is very similar to the <$ of marmorea (143 f); forewing darker and more uniformly amaiura. 
brown, the light apical spot shorter, bordered below with a white line which does not reach the margin; reni¬ 
form macula vertical, bordered by dark lines and without any white; hindwing white, dusted somewhat brown, 
the margin and veins darker brown. Expanse of wings: 52 mm. British Guiana; Amazons. 
N. difficilis sp. n. (143 f) is very closely allied to ebalea and also amatura, at once separable from these difficilis. 
two species by dark greyish-brown hindwings as well as by two thick black spots above the anal angle. Colour¬ 
ing very similar to that of a very dark ebalea (143 d), but much more monotonous; transverse markings only 
visible with the aid of a magnifying glass, the reniform macula is entirely absent, only the fine postmedian white 
oblique streak between-4 and 5 is distinct; veins finely strewn black and white; apical spot shaped as in por¬ 
gana, but much darker, greyish-brown with a yellowish tint, enclosing a short thick black longitudinal streak; 
the anal region is somewhat lighter and more brownish, with 2 thick black submarginal crescents in it. Hind¬ 
wing dark greyish-brown, feebly lighter towards the base, with brownish-white fringe. According to 1 $ from 
Teffe (Amazons); type in the Berlin Museum. 
