Fig. 3. File morphology of Arachnoscelis n. sp. (A) Scanning electron microphotograph shows the stridulatory file atop its transverse swollen vein. The long white arrow gives direction of scraper travel. Scale bar, 0.2 mm. (B) Inter-tooth distances for two specimens, the smaller animal below. Broken blue lines show the functional region (basal half) of the file as determined from HSV recordings of the 2003 specimen, which makes 4-5 pulses song^-1. Sound recordings of the 1966 specimen suggest that some specimens use a larger file region, which implies the production of a larger pulse train (more pulses), as shown in Fig. 1B.