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Estigmene acrea
Adult: forewing white with about 20 small black spots scattered across the disk, and 5 larger black spots spaced along the costa. Males have dark yellow hindwings, those of females are mostly white (with 3 or 4 black blotches in both sexes).
Larva: highly variable, blond to brown to black, with long bristly hairs standing upright in dense tufts from orange or black tubercles; hairs longer at both ends of body, especially toward the rear end. Spiracles white. Moves very rapidly. Face mainly black with yellow down the center. (information from BugGuide)
City park
Thank you for the suggestion, eelhsamarie, but I think J found the right caterpillar. I re-checked my books and I don't have this one listed in either one. Looks like I need more books! :-D
Wonderful, Aaron! Estigmene acrea seems to match better with the facial patterns as well as the body patterns.