Need cat. ID

[gwang]

Hi all,

Just wondering if anyone might know what this caterpillar is.  Roughly
2.3 cm in lenght, covered with tufts of hair, 1 pair on each segment of
the body.  The tufts are black, as is the head, near the head and anal
regions, but becomes a light yellowish colour as one moves towards the
centre.  There is a pair of orange dots on the second last segment, and
a continuous orange band running along the sides of the body from the
last thoracic segment to the anal segment.  The spiracles are white. 
Found on a plant which doesn't appear to be in the milkweed family, but
does nevertheless contain a white milky sap similar to that found in
plants of the Asclepiadaceae family.  

TIA,
Xi Wang
Winnipeg, Manitoba, Canada. 
Approximately 49 50'N 97 10'W

 
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