from China, Japan, and Corea. 77 
Genus HypDRELIA. 
(Hiibn.; Hampson, Fauna Brit. Ind., Moths, iii. p. 412 (1895).) 
Hydrelia sylvata. 
Geometra sylvata, Hiibn. Geom. fig. 231. 
Phalena testaceata, Donoy. Brit. Ins. xiv. pl. eecelxxxvii. fig. 1 (1810). 
Hydrelia sylvata, Hiibn. Verz. Schmett. p. 322. 
Asthena sylvata, Guen. Phal. i. p. 487. 
Eucheca sylvata, Meyrick, Trans. Ent. Soc. Lond. 1892, p. 74. 
Three specimens from Oiwake and two from Yokohama in 
Pryer’s collection. 
Distribution. Europe; Amur; Japan. 
Hydrelia plenaria, sp. n. 
Whitish grey. Primaries have a darker greyish band 
beyond the middle, transversely intersected by an interrupted 
line of the ground-colour, followed by a double greyish wavy 
line. Secondaries have six wavy greyish lines, but those on 
basal half are less distinct than those on outer half. Fringes 
greyish, preceded by an interrupted blackish line. Under 
surface whitish ; primaries suffused with fuscous; all the 
wings have two dusky, wavy, transverse lines. 
ixpanse 21 millim. 
‘Two male specimens from Chang-yang: June and August. 
Hab. Central China. 
Hydrelia phasma. 
Emmelesia phasma, Butl. Ann. & Mag. Nat. Hist. (5) iv. p.441 (1879). 
Acidala latsaria, Oberth. Etud. d’Entom. xviii. p. 32, pl. iii. fig. 35 
(1893). 
Hydrelia phasma, Hampson, Fauna Brit. Ind., Moths, iii. p. 412 (1895). 
I took the species at Hakodate in August, and my native 
collector obtained it at Gensan in August and also in the 
island of Kiushiu. Eight specimens trom Gifu, one from 
Yokohama, and one from QOiwake in Pryer’s collection. 
Oberthiir records the species from Ta-chien-lu. 
Distribution. Japan; Yesso; Kiushiu; Western China; 
Corea. 
Hydrelia nisarta. 
Acidalia nisaria, Christ. Bull. Mose. ly. 2, p. 49 (1881). 
A fine series in Pryer’s collection. The specimens are 
from Yokohama, Oiwake, and Gifu. I obtained the species 
at Gensan in July and at Hakodate in August. 
Distribution. Amur; Japan; Yesso; Corea. 
