Geographic location of the bug: Luang Prabang, Laos
Time: 05:28 AM EDT
Your letter to the bugman: What is this and is it poisonous?
How you want your letter signed: Dean Burkhalter
We believe this is an Baron caterpillar from the genus Euthalia, and to the best of our knowledge, it is not poisonous. There is an image on Butterfly Circle and one on FlickR to support our identification. A Check List of Butterflies of Indo-China verifies the genus is present in Laos.