v is right. It's difficult to say. Need better view of 5th and sutural striae. There is possibility of 3, maybe 4, species. I have pulled the tails on most of my Dendrophilus.

We get 4 species here in WI. D. opacus so far is restricted to the southern part of the state. There might be a possibility of it ranging up your way.

And it doesn't seem to be xavieri, since elytral stria 5 is indistinct (I tried to image that trait, but it's still hard to see - can't get the light reflection out). The punctation is quite coarse and dense, especially on the pygidium, so I'm leaning towards D. punctatus.

Elytral stria 5 is indistinct, and the pygidial punctation is coarse and dense. So it should be D. punctatus.

it isn't unusual to have a mix of 3 Dendrophilus spp in places like owl nests

I haven't done a lot of nest sampling. I have, however, done a lot of treehole sampling. You get some pretty interesting things. A good many D. kiteleyi from treeholes. I don't think I've ever got more than 1 species in a sample.

The CNC checklist lists Dendrophilus xavieri as an introduced species in Ontario. Let's see what Jeff thinks. I can do retakes if necessary.