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Anasa tristis
I started seeing these tiny golden/bronze eggs in little clusters on my pumpkin leaves. Then they hatched into these bugs. They ate all of the leaves and caused the vines to die. A few of the pumpkins also had little holes bored through them, but I'm not sure if those were caused by these or some other bugs.
Pumpkin and squash patches. (They did not eat any of the other vegetables in my garden, just the pumpkins.)
Thanks to KeithRoragen for the ID.
@KiethRoragen, Thank you for the ID suggestion! I looked at your source, and that is exactly what they are. Although I wonder why the bugs did not attack my squashini as well... maybe they don't like hybrid species? But now I know to keep an eye out for these bugs next time I plant squash or pumpkins. Thank you very much!