Forbesís tree cricket
Oecanthus forbesi and
Oecanthus nigricornis are morphologically
indistinguishable but separable on the basis of their calling songs.
Dots show county records of O. forbesi that are based on
tape-recorded males. East of the shaded area, tapes of males of
nigricornis/forbesi morphology have proved to be O. nigricornis except
for one record from eastern New York.
West of the shaded area, no forbesi males have been taped.