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Fig. 2. Four successive frames from high-speed video relate closing wing positions
to the pulse train of Arachnoscelis n. sp. Insect faces to the right.
The anal margin of the overlying (file-bearing) left wing is marked by a red
arrow; coloured broken lines match picture and wing velocities to the
oscillogram. The wings develop a velocity before each production of a pulse
(calculated CWV below frame) and then become almost still over the
interval of pulse generation; scale bar, 5 ms. (A) CWV is at 7.1 mm
s-1; scale bar, 0.5 mm. (B) During the production of the first
pulse (compare A and B) there is no detectable movement of the wings and the
CWV drops to zero. (C) The wings close further, giving a CWV
of 
14.5 mm s-1. (D) Next pulse is produced, again without
measurable displacement of the wings. Association of motionless wing intervals
with sound pulses implies scraper movement.
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