470 Messrs. Elwes and Edwards on 
reason of the well-defined sex-mark, which is never found 
in urda, and the want of the black line on vein 4 of the 
fore wing, which is found in the latter species. Graeser 
says that nanna only flies in very boggy meadows, and 
never settles on plants, but only on the ground in the 
muddy spots between the clumps of grass; whilst wrda 
is found on stony slopes thinly covered with vegeta- 
tion, and prefers to sit on the flowers and leaves of low 
plants. 
C4. urda is a very variable species, and apparently by 
far the most generally distributed species in Amurland ; 
in colour it ranges from dark rufous brown to pale 
yellowish brown, and though the ocelli are usually well 
marked, in some cases they are faint or wanting. 
i. walkyria.—I can add nothing to what has been 
said about this very distinct species by Fixsen; it has 
hitherto only been found in Korea by Herz, at about 
3000 ft. 
i. mongolica.—This species has remained unknown, 
except from the excellent figure and description given by 
M.Oberthur. Owing to the kindness of this gentleman 
I have been able to inspect one of the original specimens 
taken by the Abbé David in the mountains of Mongolia. 
It is strikingly different from every other species known 
to me, except walkyria, on account of the fringe, which, 
like that of walkyria, is absolutely unchequered ; and I 
notice that it differs from the latter, of which I have one 
male and two females, kindly lent to me by the Grand 
Duke Nicolas Mikhailovitch for comparison, in the fol- 
lowing particulars :—The general coloration is paler and 
more yellow; vein 4 of the fore wing is not heavily 
marked with brown; and, if I can judge from the de- 
scription of the female given by M. Oberthii, the ocellus 
in cell 2 is not so conspicuously larger than the other as 
it is in the female of walkyria. Though I should not 
venture to form a decided opinion as to the distinctness 
of these two species on such scanty material, yet I think 
that the two are certainly nearly allied, and though, as 
far as at present known, distinct in their habitat, yet 
they may one day be connected by intermediate varieties. 
So far as the clasp-form of mongolica can be examined 
without dissection, it appears to agree with that of 
walkyria. 
dy, sculda —The true sculda is a species which I have 
