Lepidoptera of the Khasia Hills. 
31 
840. S. diaphana, Kollar, KascTi Yon Hiigel, iv., p. 460, 
pi. 19, fig. 7 (1848). 
Shilloag and Cherra Punji ; several examples. 
841. S. melsena, Walker, i., 133 (1854). 
Shillong, several examples ; very doubtfully distinct 
from 8. diaphana, 
842. 8. discinotaj Moore, Descr. Ind. Lep. Atk., i., p. 13 
(1879). 
One example from tbe Kliasia Hills received from 
Mr. Moore ; not received from my collectors. 
843. 8. grotei, Moore, P. Z. S., 1871, p. 245, pi. 18, 
fig. 4. 
Rydrtisa serrata, Hampson, Faun. Brit. Ind. Moths, i., 
p. 22. 
Common ; received in great numbers. I have not seen 
the type, Mr. Moore does not state where it is, but it is 
probably in the Indian Museum, Calcutta, my examples 
correspond exactly with the description and with the plate; 
Mr. Hampson, at p. 218, of his vol. i., appears to have mis- 
identified this species, he says that on the fore wing the 
spot between veins 2 and 3 does not approach the outer 
margin and that there is no streak between veins 5 and 6, 
but this is not in accordance with Mr. Moore^s descrip- 
tion and figure ; the bar across the middle of the interno- 
median interspace is absent in many specimens and in 
some it is very thin. I have not seen Hampson's type of 
Hydrusa sei^ata, which is like so many of his types in 
Mr. Elwes' collection in the Cotswold Hills and not 
easil}^ got at; he does not say what sex he is describing. 
I cannot but think it must be a female, antennae with 
distal part white above is in exact accordance with the 
description of the female of 8. grotei, and the examples 
in my collection he very kindly identified for me as 
R. serrata ? are undoubtedly females of what I feel sure 
is 8. grotei, of which I have a magnificent series of both 
sexes, the males being true Syntomis with simple 
antennas. 
844. 8. suhmarginalisy Walker, Char. Undescr, Lep. Het., 
p. 89 (1869). 
Common ; received in great numbers. 
