Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.
翼上初级飞羽呈现灰白色，翼前缘经常为淡棕色或黄棕色，比飞羽的深灰色要浅。
2
The larvae, also called 'white grubs', are greyish-white to bluish-white in color, C-shaped, and also feed on decaying organic matter, such as tree stumps, and the roots of plants.
也称为幼虫，是灰白至蓝白色，C形，以腐烂的有机物为食，例如树桩和植物的根。
3
Between the white limestone and the greyish pink limestone is a thin bed of clay.