18 . NYMPHALTDyE. 
Genus LETHE. 
Z,eMe, Hiibner, Verz. bek. Sclimett. 2D. 56 (1816). 
Debts, Wcstwood, Gen. Diurn. Lep. p. 358 (1851). 
" Body rather small. AViags large ; the hind ones generally aiigulated in the middle, with a row 
of large ooelh. 
"Head rather small, scarcely tufted in front. 
" Ejies prominent, especially in the males, hairy. 
" Lahial palpi rather elongated, elevated obliquely as high as, or higher than, the level of the 
top of the eyes, and porrected to a short distance in front of the face ; the long middle 
joint without any middle tuft on the back, clothed in front with moderately short fine 
hairs, not foi-ming a close mass ; terminal joint ver}' short and slender. 
" Antenna', not, or scarcely, half the length of the fore wings, very slender ; terminated by a 
slender gradually formed club composed of very short joints. 
" Thokax very short, thick, and hairy. 
" Fore wings triangular-ovate. Fore margin strongly curved ; apical angle rounded. Apical 
margin straight, or but little emarginate, about three fifths of the length of the anterior. 
Inner margin nearly straight, about as long as the apical. Costal vein dilated at the base, 
extending rather beyond the middle of the costa. Subcostal vein with its first and second 
branches arising before the anterior extremity of the discoidal cell ; the third and fourth 
beyond it, about the same distance apart as between the origin of the second and third 
branches, and of the fourth branch and the tip of the wing. Upper discoceUular vein 
very minute, oblique ; middle discoceUular much longer, curved at the extremity, being 
directed rather outwards ; outer discoceUular longer than the middle one, nearly straight, 
also directed obliquely outwards, uniting with the third branch of the median vein at about 
the same distance from its origin as exists between the first and second branches ; the third 
branch being considerably angulated at the point of junction, whereby the discoidal cell is 
closed somewhat acutely rather beyond the middle of the wing. 
•• Hind luings subovate, more or less scalloped along the outer margin, which is generally deeply 
angulated or rather shortly tailed at the extremity of the third branch of the median vein. 
Preoostal vein curved, the tip directed outwards. Costal vein extending to about two 
thirds of the length of the costa. First branch of the postcostal vein arising at a moderate 
distance from its base, the extremity extending to the outer angle of the wing. Upper and 
lower discoceUular veins oblique, curved, of nearly equal length : the upper one arising at 
a short distance from the origin of the first branch of the postcostal vein ; the lower one 
luiiting with the median vein close to, or exactly at, the origin of the third branch, closing 
the discoidal cell in an acute point. 
" Fore legs very minute, and thickly clothed with long silky hairs. The tarsus slender, as long 
as the tibia, and destitute of joints or claws. Fore legs of the female rather longer than 
those of the male, slender, scaly, destitute of hairs, of nearly equal thickness throughout ; 
the tarsal articulations concealed by scales ; obliquely truncate at the tip, where are a few 
short spines indicating the very short terminal joints. 
" Four Jiind legs [middle and hind pair] rather short, slender, scaly ; tibiae but very slightly 
furnished with a few short spines ; tibial spurs rather long ; tarsi nearly cylindrical ; 
