NEW SPECIES OF GEOMETRIDZ FROM FORMOSA. 291 
inwardly edged with orange, followed by a greyish band on which is 
a blackish costal spot and two black marks just above middle ; 
terminal area suffused with grey; terminal line black, interrupted at 
the veins; fringes orange marked with black. Hind wings have two 
blackish transverse lines, the first is edged with orange and united 
with a black discoidal mark, the second is inwardly edged with 
orange; area beyond second line suffused with grey; terminal line 
black, dilated between veins; fringes dark grey, orange at base and 
tips. Under side orange sparsely freckled with black-brown; trans- 
verse lines as on the upper side, but blacker and more distinct. 
Expanse, 24 millim. 
Collection number, 1642. ; 
One female specimen from Kanshirei, September 14th, 1908. 
Semiothisa dubia, n. sp. 
?. Head and front of thorax brown, rest of thorax brown-grey. 
Fore wings brown-grey flecked with black on costa; antemedial line 
brown, curved, indistinct, dotted with black ; postmedial line brown, 
almost parallel with termen, not distinct towards the costa; sub- 
terminal line indicated by black dots and a blackish cloud, the latter 
on vein 6. Hind wings brown-grey flecked with black on costal 
area; traces of dusky medial and postmedial lines, the latter dotted 
with black. Fringes of all the wings brown, marked with black. 
Under side greyer than above; fore wings suffused with brown on 
the disc; markings pretty much as on upper side. 
Expanse, 32 millim. 
Collection number, 1887. 
A female specimen from Rantaizan, May 6th, 1909. 
Heterolocha olivescens, sp. n. 
3. Head whitish, palpi and pectinated antenne brown; thorax 
and abdomen pale olive brown. Fore wings pale olive brown ; 
antemedial line fuscous, curved, connected with a small fuscous 
cloud in cell; discoidal mark black, linear; postmedial line fuscous, 
outwardly edged with white, inwardly oblique from apex to vein 2, 
where it is elbowed, terminating on dorsum near the tornus; area 
beyond the postmedial line clouded with whitish. Hind wings pale 
olive brown; discoidal mark blackish, indistinct; postmedial line 
fuscous, outwardly edged with white, almost straight; terminal area 
clouded with whitish. Under side similar to the upper side but the 
postmedial line on all the wings is darker and the area within the 
line yellower. 
Expanse, 38 millim, 
Collection number, 1596. 
A male specimen from Arizan (7300 ft.), August 21st, 1908. 
Prionia pulchra, sp. n. 
3. Head and thorax carmine, frons rather darker; abdomen 
carmine, yellowish between segments. Fore wings carmine with two 
yellow transverse lines, the first almost straight, the second curved 
