448 
DEROCA. By W. Warren. 
sericea. 
hyalina. 
hi dcla. 
nconclusa. 
concinna. 
pkasma. 
roughly scaled costal margin; distal margin obliquely bent; anal angle obtuse; hindwing at the apex and distal 
margin rounded, the anal angle angularly cut off; on the hindwing veins 6, 7, 8, 9 stalked, 10 and 11 stalked, 
10 anastomoses with 8 and 9, forming an areola; thinly scaled; forewing with oval vitreous spots in the disc. 
Type: D. sericea Warr. 
D. sericea Warr. (48 c). Forewing silvery white; two large fine brown lines near the base, strongly bent 
in the cell; a proximal brown undulating line, below the centre distinct; a distal similar line strongly bent 
in the centre; at the costa behind it a brown shadow nearing the line, forming two dark small lunae and small 
spots between the veins 2 and 4 and a dot at the hind-margin; a grey marginal shadow proceeds from two 
small black subapical dots; at the apex some black spots; at the lower end of the discocellular a black 
spot; at the hind-margin close at the base a black dot; the lower half of the cell and the space between the 
median vein and the submedian fold as far as the distal line is semi-diaphanous; fringes white with a few 
small dark scales at the base. Hindwing with a feeble median line, a double grey distal line, the distal part 
of which is marked with small black vein-dots, and a single bent subterminal line; at the lower cell-end a very 
small black dot. Under surface silvery white, costal area of forewing for three quarters of its width smoky 
black; head, thorax, and abdomen all white. Described from 3 <$$ from the Khasia Hills in Assam. 
7. Genus: l>eroea Wkr. 
Proboscis present; palpi very short, very small; antennae in both sexes bipectinate, the branches in 
the 9 short; middle tibiae with one, hind tibiae with two pairs of short spurs; wings semi-transparent with 
black or grey markings; forewing with a curved costal margin, an obtuse apex, and an oblique bent distal 
margin; vein 6 from the upper cell-angle, 7, 8 forked, 9, 10, 11 forked, 9, 10 anastomosing with 8 and forming 
an areola; 11 proceeds shortly before the end of the areola, 7 from the end, 10, 9. 8 bend towards the costa, 
at equal distances; on the hindwing 7 strongly anastomoses with 8. Type: D. hyalina Wkr. 
D. hyalina Wkr. (48 b, and Vol. II, pi. 48 c). Wings hyaline grey; forewing with 3 proximal and 3 
distal grey undulating bands; hindwing with only 3 distal ones; at the distal margin a fine dark line; head, 
thorax and abdomen dark brown, scantily clothed with light hairs. Expanse 44 mm. It occurs in the Penjab, 
in Sikkim, the Naga Hills, Manipur, and East Pegu in Burma. 
D. hidda Swh. ( = subhyalina Strand) (48 c). Smaller than hyalina, expanse only 34 mm; slightly greyer; 
costal-marginal area, the lines and transverse shadows somewhat brighter; of the 3 distal antemedian shadows 
only the distal one is distinct; of the three post median ones the most proximal one forms the most distinct 
grey shadow, all 3 being marked by dark patches on the veins; on the discocellular an angular black line; 
hind wing with a dark proximal line and 3 distal ones; at the distal margin a dark line; head, thorax, abdomen, 
and antennae dark grey. Sikkim, Jaintia Hills in Assam; Mao, Manipur in Burma. 
D. inconclusa Wkr. (= maculata Mr.) (48 c). Forewing dull whitish; the markings dark greyish; near 
the base 3 angular bands, the first two terminating at the median, the 3 rd and the proximal line extend obli¬ 
quely to the subcostal, then they are marked by a dot on the median at the base of vein 2 and by a quadran¬ 
gular spot at the hind-margin; on the discocellular two grey spots, the one at the upper end smaller, mostly 
coherent; above it a costal oblique streak; a broad subterminal band, distally dentate, between veins 3 and 5 
broadly interrupted; at the distal margin a similar grey band; on the hindwing at the distal margin a grey 
band composed of 5 spots,- one at the apex, one on each side of vein 5, and one on each side of vein 2; before 
the margin an indistinctly marked, narrow, grey band; on the under surface the dark markings show through; 
head, thorax and abdomen Mack. Expanse 40 mm. The type of maculata is from Masuri; where inconclusa 
was found is unknown. 
D. concinna sp. nov. (48b) is smaller than inconclusa , the 9 has an expanse of but 36 mm, the <$ 32; 
in the 9 the markings are of an almost identical position and colour, whereas in the the markings are much 
blacker; through the subterminal dark band we often see a light slate-coloured subterminal line; on the hind¬ 
wing there are two thick grey postmedian bands and traces of a proximal one, marked by vein-dots. Head, 
thorax, and abdomen blackish, tinted with grey. In the Tring Museum from the Naga Hills in Assam, and from 
Mao, Manipur in Burma. The ground-colour of the is bluish-white, that of the 9 bluish-grey. 
D. phasma Btlr. (Vol. II. pi. 48 c), from Japan, has about, the same size as concinna', the markings 
in the are blacker and in the 9 much feebler; the white area between the subterminal and terminal band 
is much narrower, almost linear, the marginal band is not interrupted, but with an oblong grey filling bet¬ 
ween the veins; the distal margin of the dentate subterminal band forms a large black spot on vein 4. 
