Mr 
Chorisoneura thalassina, sp. n. 
d. Pale sea-green. Eyes black. Antennae pale testaceous. Pro- 
notum transversely elliptical, posteriorly truncate, exposing the scutel- 
lum; lateral margins broadly hyaline. Tegmina hyaline, 16 costals, 
radial vein giving off 4 rami towards the sutural margin, anterior ulnar 
vein with 6-7 oblique rami, posterior ulnar simple, all the veins 
joined by many reticulations. Wings hyaline, costal margin green; 
mediastinal vein ramose, 11 costals, their apices incrassated, their bases 
angulated, medio-discal area four times broader than the medio-ulnar, 
crossed by 9 transverse venules, ulnar vein 3 to 4-ramose at apex, 
apical triangle acutely angled at base, subtruncate at apex. Supra-anal 
lamina trigonal; subgenital lamina asymmetrical with a pair of large, 
flattened, strap-like styles, unequal in sise and pressed closely to the 
sides of the lamina. 
Total length 14 mm.; length of body 11 mm.; length of teg- 
mina 11,5 mm.; pronotum 2,9 mm. Хх 4,» mm. 
One example only. 
Revue Russe d'Entom. XH. 1912. № 1. 
