Caterpillar Identification

[BC Al]

Hello all

I am a forester who lives in the central interior of British Columbia, 
Canada, specifically in Prince George.
On a field trip today I came across a unique looking caterpillar.

The caterpillar was munching away on a Ribes sp. leave and has the following 
description.

It is basically a light green caterpillar and has a green head with black 
stripes. Each section of the body has a black stripe on it interrupted by 
bright orange dots. 

I have searched around my identification books but have been unable to id 
this fellow.

Any help in it's id would be greatly appreciated.

TIA

Al Wiensczyk
alwiensc at pgonline.com