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Photo#1608290
Beetle - Xanthogaleruca luteola

Beetle - Xanthogaleruca luteola
Toronto, High Park, Ontario, Canada
July 31, 2018
Size: ~ 8 mm
Can this be identified further? Thank you.

Moved
Moved from Trirhabda.

Do you have any idea of the host plant?
My initial thought was T. convergens...though the pronotal spots seem too small (and the narrowly elongate medial one is peculiar...a virtual "exclamation point"!).

 
Unfortunately I have no idea
Unfortunately I have no idea of the host plant. The setup was in the woods but there are fields and gardens near by. It could be many things.
Is there any chance it could be an Elm Leaf Beetle?

 
Yes, fits characters for dark form of Elm Leaf Beetle
See ID comments from the BugGuide info page for Xanthogaleruca luteola here. Note the dark spot above the antennae (barely visible); the two (somewhat subtle) short dark medial vitta at the base of each elytron; and the "pinched" medial spot on the pronotum.

This is definitely not Trirhabda, since in that genus the 3rd antennomere (= antennal segment) is shorter than the 4th...whereas in your photo the 3rd antennomere is longer than the 4th (see discussion here).

PS: These, like so many other taxa, can be tricky! In the future, please only place posts at the level where you're certain of the ID...else errors can go unnoticed for a long time, and potentially mislead folks. Better to err on placing things with certainty at a higher rank (i.e. Coleoptera or Chrysomelidae) than at a possibly lower erroneous rank (like Trirhabda here). It may take a while, but usually posts will eventually work there way to the best level that all of us can collectively figure out ;-)

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