bog katydid
Sphagniana sphagnorum (F. Walker 1869)

long-winged female
short winged female

10 s of calling song [865KB]; male. Recording by G. K. Morris; used by permission.
9 s of calling song slowed to one-eighth speed [775KB] (frequencies are reduced to 1/8 of their original values and durations are 8 times greater).

Waveform of 0.6 s of calling (from recording by G. K. Morris). The song alternates between a sonic mode (extreme left and center right) and an ultrasonic mode (extreme right and center left). Peak frequency of sonic mode is ca. 16 kHz; of ultrasonic mode, ca. 32 kHz.

Click on first half of waveform to hear graphed song. The sound you will hear lasts 4.8 s, because it is the graphed sound slowed to one-eighth speed, which lowers the peak frequencies to 2 kHz and 4 kHz.

Click on second half of waveform to expand first transition from ultrasonic to sonic mode.

References: Morris 1970, Morris & Pipher 1972, Morris et al. 1975.

Nomenclature: OSF (Orthoptera Species File Online)