An oak tree along our road out is oozing a watery sap. From bubbles and smell of the sap, I'd say the oak has a hollow inside where the sap is fermenting. The tree splits into two trucks about three feet off the ground. I'd speculate it was damaged in last winter's ice storm. Regardless, a wide variety of insects from butterflies to beetles are feasting on the sap. Below are a few of the sap-feeders I've been able to at least partially identify.
Four-spotted Sap Beetle (Glischrochilus quadrisignatus): According to BugGuide the scientific name for this genus of beetle is formed from the Greek glischro, meaning sticky, plus chilus, meaning lip. Sticky Lip seems and appropriately descriptive name for a sap-feeding beetle.
Picnic Beetles is the common name for these beetles because they are often attracted to sodas and, especially, beer consumed outdoors.
Longhorned Beetle (Neoclytus sp.) Probably an Ash Bore, but I'm not certain.
Scarab Beetle: Fruit and Flower Chafer (Euphoria sp.) According to BugGuide, "Adults visit flowers for pollen and/or nectar. Also take rotting fruit." Obviously, adults also like fermented sap.
A faded and torn Hackberry Emperor Butterfly (Asterocampa celtis). Often feed on sap as well as fluids from dung and carrion.
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