1975] 
Willey — Sound Production in Arphia 
325 
An alternative method, ptenocinematography, 1 is capable of fine 
resolution of visual-acoustical signals. Walker et al. (1970) showed 
that motion pictures of actions and the oscillograms of sounds pro- 
duced by those acts can be synchronized by using a two-lens system 
of an ultra-high-speed motion picture camera to show the generation 
of stridulations by tree crickets (Oecanthinae) . I wish to present 
here an independently developed method which uses a similar prin- 
ciple for analysis of femoro-tegminal stridulations of the grasshopper 
Arphia sulphured. The basic behavior patterns of A. sulphurea have 
been described in detail by Otte (1970). I have published an ab- 
stract of the methods (Willey, 1971). 
Materials and Methods 
Arphia sulphurea was reared in captivity from eggs produced by 
females collected in an abandoned gravel and limestone quarry in 
the village of Oconomowoc Lake, Waukesha County, Wisconsin. 
Figure 1 diagrams the arrangement of the photorecording equip- 
view. CRO — cathode-ray oscilloscope, OSC = oscillo-lens, MIC = micro- 
phone. Three movie lights were used in addition to the two on either side 
of the cage, one was attached to the HYCAM above the objective lens. 
1 Pteno- (derived from the Greek term for rapid, high velocity ), a prefix 
to be preferred to the awkward “ultra-high-speed motion photography” 
and other phrases. 
