Evans called I. similis the Blue Glassy Tiger (1928, 1932), at which time vulgaris was considered a subspecies.
It is more deserving of the name Blue Glassy Tiger as it is larger & bluer.
I came across one in the Damansara park which is in the Klang Valley 10 years ago, and was struck by its larger size & distinctly bright blue colour.
In contrast I. vulgaris appears dark & greyish blue.
It was also photograhed in Kuala Selangor in 2009.
A recent shot taken south of KL below is labelled I. vulgaris. https://www.inaturalist.org/photos/13440873
As it feed on the same hostplant as I. vulgaris it is probably in Johor by now.
A posible explanation here is taht the shots are escapees from a nearby butterfly farm.
TL Seow: Cheers.
PS. I fail to see it is written the pix were taken in a butterfly garden. That explains the whole thing.
Last edited by Psyche; 31-May-2018 at 10:24 PM.
Reason: PS