Mystery Bird: Short-tailed Magpie, Cissa thalassina

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[Mystery bird] Short-tailed Magpie, Cissa thalassina, endemic to the South Pacific Maritime
Southeast Asian islands of Borneo and Java. [I will identify this bird for you in 48 hours]

Watercolour and gouache sketch on paper.

Image: Thomas Lewin, early 1800s [larger view].

Please name at least one field mark that supports your identification.

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Ooh I know, I know!

Short-tailed magpie (Cissa thalassina). The bright green plumage and black mask set the green magpies apart from all other corvids. And the short-tailed magpie is the only species endemic to Borneo and Java.

More spectacular in real-life despite the uninspiring name - and Borneo and Java aren't really in the South Pacific.

ahh, but which subspecies?

Because of the dark eyes, this is a depiction of the nominate subspecies Cissa thalassina thalassina which is only found on Java... the oher subspecies, Cissa thalassina jeffreyi is only found on Borneo and has whitish eyes:

Cissa thalassina jeffreyi, Borneo

By the way, from an ecological geography persepctive, I agree with Andrew (South Pacific = Australasia or Oceania) where both Borneo and Java are considered west of the Wallace Line and therefore Maritime Southeast Asia (as opposed to the geopolitical entity of Southeastern Asia) and more likely related to Asiatic taxa (the Line is based upon the deep water between two large continental shelf areas, a barrier that kept the flora and fauna of Australia separated from that of Asia for over 50 million years)

okay, i changed the name of the area to match your comments. but that entire oceania/southeast asian/australasian/wallace's line region is where my heart and mind have been firmly planted ever since i first read wallace's book, the malay archipelago, when i was a mere grasshopper.