246 GEOMETRID&., 
inwards on vein 1; an indistinct whitish submarginal sinuous line, 
Hind wing whitish, with subbasal line and postmedial sinuous line 
angled outwards on vein 4. 
The form porphyria has the thorax brown; the wings much 
browner, with hardly a trace of white areas and with indistimet 
sinuous medial line. 
Hab. Japan; N.W. Himalayas; Khdasis. Exp., ¢ 66-74, 9 
108 millim. 
30803. Biston cognataria, Guen. Phail. i, p. 208. 
Differs from regalis in being grey thickly irrorated with fuscous, 
the vertex of head and collar whitish; fore wing with the ante- 
medial line more angled on median nervure; the postmedial line 
prominently angled between veins 4 and 6; the medial sinuous 
line of both wings more prominent. 
Hab. N. America; N.W. Himalayas. Exp., $ 36, 9 62 
millim. 
B. (Eubyjodonta). Both wings with the outer margin erenulate and 
more or less produced at vein 4. 
3004, Biston sinuata, n. sp. 
3. Pale brown, irrorated with fuscous; collar fringed with 
black; abdomen ringed with black. Fore wing with an obliquely 
curved antemedial black line with a brown band inside it; both 
wings with indistinct medial line; a postmedial black line with 
two brown lines beyond it, excurved between veins 4 and 7 of fore 
wing and angled at vein 6 of hind wing ; outer area reddish brown, 
except at apex of fore wing. ; 
Hab. Sikhim. Exp. 72 millim. Type in B.M. 
/ 3355. Biston falcata, Warr. P. Z. 8S. 1893, p. 416. 
g. White, irrorated with black spots; head fulvous; thorax 
barred with black; abdomen yellowish. Fore wing with sinuous 
antemedial fulvous band; both wings with similar submarginal 
band and some large and small fulvous spots on margin. 
Hab. Sikhim. Hap. 62 millim. 
Secor. II. Proboscis more developed ; frons less hairy ; hind tibize 
with the first pair of spurs medial; wings with the outer 
margins non-crenulate. 
A. (Amraica). Antenne of male with very long uniserrate 
‘pectinations. 
3356, Biston recursaria, Wik. Cat. xxi, p. 374; C. & S. no. 3330. /. 
Boarmia ferrolavata, Wik. Cat. xxvi, p. 1586; C. & S. no, 3324 
Boarmia solivagaria, Wik. Cat. xxxv, p. 1586. éb 
Amphidasys superans, Butt. Ii. Het. i1. p. 48, pl. 35, fig. 3. 
Amraica fortissima, Moore, Lep. Atk, p. 245; C. & S, no, 3852 
