mystery caterpillar

Observation - mystery caterpillar. Description: Black hairy caterpilar with red stripe on flanks and double row of white spots on back. 16mm long. The spots are missing from the 4th body segment, that is tesegment after the one withthe 3rd pair of legs. Any ideas?

Black hairy caterpilar with red stripe on flanks and double row of white spots on back. 16mm long. The spots are missing from the 4th body segment, that is tesegment after the one withthe 3rd pair of legs.

Any ideas?