Sub-Family : Pyrgiinae
Species: Satarupa gopala gopala Moore, 
Common name(s): The Large White Flat
Photography location: Ba Vi foothills (Hanoi)
Monastyrskii & Devyatkin (2016) listed 2 Satarupa species in Vietnam viz. gopala & zulla - the former widespread (N., C.), the latter only recorded from Lao Cai Prov..
FW with a serie of 8 irregular-shaped white spots recurving transversely from costal margin before the apex to near posterior margin, being there joined by a white longitudinal streak; a similar triangular-shaped spot whithin the discoidal cell. HW pure white, with the base and narrowly along anterior margin maroon-brown; a double row of black marginal spots, the interspace between the rows being suffused with bluish grey (from Moore's original description, in "On the Lepidopterous Insects of Bengal. Proceedings of the Zoological Society of London". Pg. 780).
Figure of Satarupa gopala from Moore's original description
Frederic Moore was a British entomologist. He was also an illustrator and produced six volumes of Lepidoptera Indica.
Frederic Moore (1830-1907)