The adult  lays an egg in the bark which develops into the larva. This larva feeds throughout the tree and pushes its frass out through it's widened entry hole in the bark.

The adult lays an egg in the bark which develops into the larva. This larva feeds throughout the tree and pushes its frass out through it's widened entry hole in the bark.

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This is the critter, flathead borer larva, that created the gallery of tunnels which gives these bowls their interest and color

This is the critter, flathead borer larva, that created the gallery of tunnels which gives these bowls their interest and color

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Here is the evidence of the insect activity on the outside of the bark.

Here is the evidence of the insect activity on the outside of the bark.

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Some borers are active just under the bark. This one riddles the entire tree. Bad for the tree; good for the bowls.

Some borers are active just under the bark. This one riddles the entire tree. Bad for the tree; good for the bowls.

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