OF INSULINDE. 49 
diaphanus Gerst., modestus Gerst. and inquinatus Mac Lachl. 
The first belongs to the typical group, as O. chrysops L., 
the two latter have in the © a tubercle on the hindborder 
of the forewing and must probably be ranged in a new genus. 
Osmylus diaphanus Gerstaecker. 
(Plate 4, fig. 17). 
Osmylus diaphanus Gerstaecker, Mitt. naturw. Ver. Neu-Vorpomm. und 
Rügen, XXV, p. 168 (1893). West Java. 
Body small and slender, brown, the antennae yellow, 
with the two basal joints brown, reaching about the middle 
of the forewing. Head and body brown or yellowish brown, 
the legs pale yellow, the arolium black and the claws 
red-brown. ‘The coxae and trochanters like the breast 
pitchy brown. 
Wings hyaline, very large, with obtusely angulated tips. 
Longitudinal nervature pale yellow, crossveins brown. The 
costa in the forewings with numerous small brown spots, 
the subcosta and radius less spotted with brown, but with 
three larger brown spots, a small one before the middle, a 
larger one somewhat beyond the middle and a smaller one 
surrounding the whitish pterostigma. There are also some 
small dark points along the gradate veins in the apical 
part of the discoidal field, The base of the forewing between 
radius, origin of radial sector and hindborder brown. 
Hindwings much narrower, with a dark spot at the 
pterostigma like in the forewings and some dark spots at 
the gradate veins. In the basal fourth is a small brown 
point at the hindborder and a larger triangular transverse 
one surpassing the cubiti at both sides before the middle. 
Costalveins very numerous and simple in both wings. 
Body 9 mm., forewing 181 mm., hindwing 17 mm. 
Abd. 5 mm, gr. br. 8 mm., gr. br. 6 mm, 
Habitat: West Java. 
Gerstaecker’s type is from West Java and I examined 
Notes from the Leyden Museum, Vol. XXXI. 
4 
