I was stung by both of these at different times and both were SEVERE! The Tussock Moth ( Orgyiz levcostigma) Caterpillar has put people in the hospital. The Saddleback Moth (Sabine stimulea) Caterpillar sting hurt for weeks. Thanks to Noel Bryan at Columbus State College for identification. Nikon N70, SB26, Velvia, 105 2.8D Macro, 4 diopter lens.