As this long, hot summer winds down, I’m seeing Facebook posts with accompanying photos about yellow garden spiders and fuzzy caterpillars. A photo of a large leaf holding several easily identifiable brown and green saddleback caterpillars with the query, “What are they, and what should I do?” appeared on my page last week. My first thought was, “Don’t touch!” Late summer and early fall herald the appearance of stinging caterpillars that live in Virginia. I have written about several species in past columns, but the pain and discomfort their stings cause warrants a review this week. Next week, we’ll look at two more stinging caterpillars. Rule #1 to avoid getting stung is: Always wear gloves! Caterpillars tend to hang out on the undersides of leaves where you can’t see them, especially in late summer or fall when they are feeding and we are clearing out leaves and other debris to prepare for fall planting. Rule # 2 is: If you are stung or bitten by any insect or animal, try to take a p...