Dr. Thomas Walker has ID'd the singing of this female's partner as O. forbesi. According to Dr. Walker: "The tree cricket calling on catmint in the 80’s (temperature) was producing 82 sound pulses per second at a carrier frequency of 4.6 KHz. Checking Fig. 12 in p. 781 in my 1963 paper on the nigricornis group, your cricket is definitely the fast-trilling form or O. nigricornis (i.e., Oecanthus forbesi)." Even with the 'naked' ear I could tell the males in the patch of catmint sounded different than other species. Visually, the females look bright green with a yellowish head (but I don't know if that's true with all Forbes' females.)