180 T. R. M‘Lachlan on the 
veinlets on each side; one or two minute basal spots, one 
or two in the middle, and a large one beyond the middle 
(formed of two or three smaller spots), all dark brown 
or fuscous; the inner margin clouded with greyish-tes- 
taceous, and many of the ‘discal veinlets margined with 
the same colour; all the costal veinlets simple; the sector 
with about 13 branches ; the two series of gradate veinlets 
rather irregular and scarcely parallel; in the posterior 
wings the ‘dark spots are absent, excepting that at the 
pterostigma. 
Expanse 34 mm. 
One example from Yokohama (Pryer), in Wormald’s 
collection. 
O. tessellatus, sp. nov. 
Black, with grey pubescence. Head much swollen 
above 5 the ocelli minute, yellow, and there is a yellow 
ring at the base of the antennz; face yellow, with a fur- 
cate black mark between the antenne; a small yellow spot 
in the middle of the pronotum anteriorly. Legs pale 
yellow, with concolorous hairs; terminal tarsal joint 
blackish; claws strongly serrate internally. Anterior 
wings elongate and broad, vitreous; most of the neura- 
fon’ 1s black, but partly w hited, the sub-costa and radius 
yellowish, with black lines; many of the transverse vein- 
ine are broadly margined with dark grey, giving the 
wings a chequered appearance; the inner marginal and 
apical area clouded with grey in an ir reoular manner, 
causing pale and dark spaces; some darker (almost 
blackish) spots at the pterostigma and on the disk; costal 
veinlets mostly simple; sector with 15—16 branches ; the 
series of gradate veinlets very irregular, many of those in 
the outer series absent. Posterior wings with dark marks 
at the pterostigma, the inner marginal area clouded with 
pale grey. 
Expanse 52 mm. 
One example from Yokohama. (Pryer), in Wormald’s 
collection. 
O. Pryeri, sp. nov. 
Head and thorax yellowish-grey ; clypeus and labrum 
yellowish ; upper part of face and front of vertex shining 
black, and the margin of the vertex and of the pronotum 
is black ; the pronotum with long black hairs at the 
