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Fig. 4. Four successive frames from high-speed video (scale bar 3 mm) showing
tegminal positions within the time course of the (closing) AM pulse pattern in
Myopophyllum n. sp. The insect is oriented upward. The position of
the right wing scraper region, visible through semitransparent wing cells of
the left, is marked by a red arrow; coloured broken lines show where in the
oscillogram time course the frame was obtained. (A) CW velocities are
associated with each frame: the wings lose velocity before the production of a
pulse. Scale bar, 2 ms. (B) There is a conspicuous displacement of the wings
during the production of a pulse and the CWV increases to 
142 mm
s-1. (C) The wings close again more slowly during the silent
interpulse interval and CWV drops to 82 mm s-1;
during this time interval the scraper is relocated. (D) The new pulse is
produced with a conspicuous displacement of the wings; CWV increases
to 118 mm s-1.
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