18 
NYMPHALTD^. 
Genus LETHE. 
Lethe, Hiibner, Verz. bek. Schmett. p. 56 (1816). 
Debts, Westwood, Gen. Diurn. Lep. p. 358 (1851). 
" Body rather small. Wings large : the hind ones generally angiilated in the middle, with a row 
of large ocelli. 
"Head rather small, scarcely tufted in front. 
" Eijes prominent, especially in the males, hairy. 
" Labial 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 forming a close mass ; terminal joint very 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. 
" Thorax 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 discocellular vein 
very minute, oblique ; middle discocellular much longer, curved at the extremity, being 
directed rather outwards ; outer discocellular 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 angulatcd at the point of junction, whereby the discoidal cell is 
closed somewhat acutely rather beyond the middle of the wing. 
" Hind wings 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. 
I'recostal 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 discocellular veins oblique, curved, of nearly equal length ; the upper one arising at 
a short distance from <.he origin of the first branch of the postcostal vein ; the lower one 
uniting with the median vein close to, or exactly at, the origin of the third branch, closing 
the discoidal cell in an acute ])oint. 
" Fore 7e;/n very minute, and t hickly clothed with long silky hairs. The tarsus slender, as long 
as tlie til)ia, and dcistitute of joints or claws. Fore legs of the female rather longer than 
those of the male, slondcir, scaly, dcstit.uto of hairs, of nearly equal thickness throughout ; 
the tarsal articulations concealed by scales ; obliqucsly truncate at the- tip, where arc a few 
short Kpinr>s indicating tlic very short terminal joints. 
" Four hin/l legs [middle and liind pair] rather short, slender, scaly ; tibioB but very slightly 
furnished with a few short spines ; tibial spurs rather long ; tarsi nearly cylindrical : 
