It looks like Leptura plebeja in Yanega's Northeastern Longhorned Beetles, but I'm no cerambycid expert. Leptura spp. do appear to have long tibial spurs in Yanega's photos.

as this photo illustrates:



Obviously I overlooked that genus. (And, just as obviously, erred in referring to "tarsal" rather then "tibial"spurs.) Many thanks for the correction and enlightenment!

"almost certainly the black form of plebeja; the angle is not ideal, but it looks as if the humeral angle bulges rather than forming a relatively even convexity with the pronotum. It does overall look broader and duller, as well.
"206932 and 864471 both look much more like lugubris; too bad there's no scale bar - the size difference between these species is pretty significant."
the last paragraph refers[thumb:] to these:

but I didn't see any Lepturines with such large tarsal spines.