Bug of the Week: Baltimore Checkerspot Caterpillar

An insect from the archives…

Baltimore checkerspot larva-1This is a Baltimore checkerspot caterpillar I found a few years ago in western New York state.

Baltimore checkerspot caterpillar 4

As you can tell from the bright orange and black warning coloration, it is likely this species is chemically protected. How noxious a given caterpillar is, however, depends on whether it feeds on certain chemically-defended host plants.

Another species, Harris’ checkerspot, has caterpillars that are orange and black as well. They look very similar and are apparently mimics.

You can find photographs of Baltimore checkerspot host plants, life cycle, and a link to coloring pages at the Maryland Dept. of Natural Resources.


  1. Jeff

    Bug of the Week is a great concept. I could show this image on a SmartBoard and ask for student insight.

  2. Roberta


    Good to hear from you. That is a great idea. We should talk! 🙂

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