Fig. 1. Features of Arachnoscelis n. sp. (A) Male adult insect on human arm (photo by D. E. Klimas); scale bar, 15 mm. (B) One calling song of two pulse trains, more typically one train; scale bar, 20 ms. (C) High resolution of a mid-train pulse; scale bar, 100 µs. (D) Smoothed power spectrum of calling song. (E) ZC analysis of the pulse in D. Note how the frequency drops for the driven cycles (black arrows), indicating a decrease in velocity, then increases during decay (red arrow), suggesting that the scraper has disengaged from the file (event indicated by red asterisks); note that the file's resonant frequency is normally higher than that of the calling song. Blue arrows show the free decay of the pulse. Q, quality factor.