106 
EUSTROMA. By L. B. Prout. 
inextricata. 
aerosa. 
aurigena. 
chalcoptera. 
chrysoprasis. 
propriaria. 
fractifascia¬ 
ria. 
melancholi- 
c a. 
venulata. 
brunnearia. 
metaria. 
lativiitaria. 
species, but as this does not hold for a $ from Chia-kou-ho (1700 feet) I do not stress it. Omei-shan, 3620 feet, 
July, type from the Leech collection; the here figured (Omei, 23 August) is in my collection. 
E. inextricata Walk. (Vol. 4, pi. 13 a). The forms from China, Formosa and even Corea and Japan 
have not yet been demonstrated to differ from the name-typical inextricata of N. India, but aerosa Btlr. must 
be separated (see below). I have inextricata from Nikko, beginning of September (Dr. Cockayne) and have 
seen others from “Japan", less well localized. 
E. aerosa Btlr. (10 f) is extraordinarily like inextricata but lacks the black patch of specialized scales 
on the hindwing above, though the pencil on the forewing beneath is equally well developed in both. I have 
hitherto failed to find any other constant difference, though aerosa may be on an average larger and lighter; 
and inasmuch as Butler's type (from Hakodate) is a $, one cannot yet say with absolute certainty that it 
may not be a rather large, light inextricata, in which case the present species would require a new name. Besides 
Japan, I only know it from Kwanhsien. 
E. aurigena Btlr. (Vol. 4, pi. 13 b). The types of this and the following species both came from the 
N. E. Himalayas, but both extend into Kashmir. Our figure scarcely does justice to the green gloss of fresh 
specimens but is well recognizable. The description should have emphasized the light colour of the £ hair-tuft, 
as this offers the best distinction from the following. 
E. chalcoptera Hmps. (10 f). Hampson differentiated this from aurigena by the “chestnut”, not bronzy, 
ground-colour of the forewing and the pale hindwing. The latter is generally valid, but the ground-colour (light 
bronzy-green) of the forewing is almost alike in fresh specimens. The hair-pencil of the $ underside is black. 
The dark markings in chalcoptera are generally more chocolate (less fuscous) than in aurigena, the subbasal 
generally more extended, the median band often uninterrupted, in this case much widened in the cell and about 
the 3rd radial (i. e. in front of the posterior constriction). Belongs chiefly to Sikkim, but occurs also in Kashmir 
Valley. 
E. fissisignis Btlr. chrysoprasis Oberth. (Vol. 4, pi. 10 1, as chrysoprasis) is the correct name for the Chinese 
form of this collective species. I now believe it to be differentiable from the N. Indian fissisignis by the ap¬ 
preciably larger sex-patch in the cell of the lorewing above, but the markings scarcely differ. By the hair- 
tuft of the hindwing beneath, this species falls into Sterneck’s genus Pareustroma, with the following. 
E. propriaria Leech (Vol. 4, pi. 13 d). Sterneck proposes to constitute this the type of a new genus, 
Pareustroma, agreeing in most structural characters with Eustroma but with the palpus somewhat longer; dif¬ 
ferentiated chiefly by the presence, in the middle of the abdominal marginal of the £ hindwing beneath, of a 
large tuft of gold-yellow hairs. 
E. fractifasciaria Leech (Vol. 4, pi. 13 d). As this appears to lack the special hair-tuft of the two preceding, 
as also the androconial patch in the cell of the forewing above, I think it better to transpose it and propriaria, 
in order to leave the turn “ Pareustroma” species together. The type of fractifasciaria is not very fresh, but 
I do not think the special tufts can possibly have been lost by abrasion. 
E. melancholica Btlr. (Vol. 4, pi. 7 1). The synonymy given in Vol. 4 (p. 208) was inexact as it did not 
take into account the geographical variation; chlorovenosata Christ., founded on specimens from Vladivostok, 
June and August, belongs to the E. Siberian race venulata. The group has also a race or representative on For¬ 
mosa. — venulata Oberth. (= chlorovenosata Christ.) (Vol. 4, pi. 8 e) is not always quite so gay as in the type 
figure, but is well separable from melancholica by the more decided green admixture on the forewing, particu¬ 
larly in the pale areas which bound the darker median band. This race belongs exclusively to the Ussuri district. 
brunnearia Leech (10 g) is only known to me from the type $ but, whether as aberration or subspecies, it 
seems better to keep it separate from the venipicta Warr. (= pilosa Th.-Mieg) of Sikkim; larger, the colour- 
contrasts sharper, the brown parts (corresponding to the green of the preceding) warm and bright, the white 
element (especially on the hindwing) better developed. Pu-tsu-fong, 9820 feet. 
E. metaria Oberth. (Vol. 4, pi. 10 1). Dr. Wehrli has very kindly supplied me with information regarding 
the structure of this hitherto undescribed species, confirming my supposition that it should belong to Eustroma 
(sens. lat.). Palpus long (1 %—2), with 2nd joint thickened; face convex, without projecting tuft; antenna 
shortly ciliated; venation normal; forewing beneath with a long, slender black pencil, concealed by the costal 
area of the hindwing; hindwing without special modification. The $ is unknown. 
E. lativittaria Moore (10 g) is a fine large species, strongly glossy and not liable to be mistaken for any 
other. The $ has, on the forewing beneath, the Eustroma hair-pencil, although this was overlooked by Hampson, 
who consequently assigned it the wrong position. Palpus less elongate than in most Eustroma. Described from 
Darjiling, but reaches Kashmir. I have also seen a few specimens from Szechuan (Kunkala-shan) which are 
not in absolutely perfect condition but in which I cannot detect any deviation whatever from the typical form. 
