498 



WARO NAKAHARA : 



Berotha (Isoscelipteron) Okamotonis n. sp. 



Head yellow, face and mouth-parts somewhat darker ; antennas 

 yellow, basal joint much elongated and covered with yellowish hairs, 

 other joints brown in their terminal half, thus giving the antennae an 

 annulated appearance ; compound eye black. 



Prothorax yellow, with a lyre-shaped impression in the middle, 

 and also two obscure transverse grooves above ; broadly dark brown 

 on both sides, which are covered with very long hairs of that color. 

 Meso- and metathorax fuscous yellow, covered with hairs. 



Abdomen fuscous, pale on ventral side and at apex ; in the male, 

 the apex with two very long and slender, inferiorly directed appen- 

 dages which are covered with very long hairs. 



Legs pale, covered with long hairs ; anterior tibia and femora 

 spotted with fuscous. 



Forewing hyaline, with pale neuration ; all veins except subcosta 

 minutely spotted with fuscous ; margin of the wing, but especially the 

 basal parts of inner marginal and apical areas, faintly marked with 

 brown ; cross-veins fuscous black and margined with fuscous ; along 

 inner margin of the wing, several distinct blackish spots caused by the 

 branching and black-marked ends of anal and cubital veins ; ptero- 

 stigma blood-red. 



Costal area with about 20 cross-veins ; all the cross-veins, except- 

 ing those at base of the area, with two or three branches ; three cross- 

 veins between radius and radial sector ; the sector with 8 or 9 branches. 



Hindwing also hyaline ; principal veins pale yellow ; cross-veins, 

 especially those of the gradate series, fuscous black ; pterostigma 

 reddish yellow ; hind margin with long hairs in basal parts only ; with 

 6 veins in the gradate series. 



Measurements : 



Length of body io mm. 



„ ,, antennae 8 „ 



