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southeastern field cricket

Gryllus rubens Scudder 1902

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map long-winged male short-winged female female
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short & long wings four morphs forewing file characters
ovipositor length      
10 s of calling song; male from Leon County, FL; 25.4°C; smooth trill. (WTL482-189b)
22 s of calling song; male from Pope County, IL; 24.0°C; stuttery trill. (WTL482-61)
7 s of courtship song; male from Florida. [Recording by D. A. Gray; used by permission.]
 Click on sound bar to hear graphed song.
Sound spectrogram of 2 s of smooth calling at 25.4°C (from WTL482-189b). Dominant frequency 4.8 kHz.
 Click on sound bar to hear graphed song.
Sound spectrogram of 2 s of stuttery calling at 24.0°C (from WTL482-61). Dominant frequency 4.9 kHz.
Song: The trills of G. rubens vary in the regularity of the pulse sequences. When the pulses are interrupted by brief pauses lasting as long as a single pulse or a little longer, the trill sounds "stuttery." When the sequence of pulses is uninterrupted, the trill is "smooth." In some populations, stutter trilling is common. In others it is rare. Captured males do not always produce a single type of trill. The origin and significance of the variation in the smoothness of the trills is unknown.
Identification: This species and Gryllus texensis are the only trilling Gryllus in the eastern United States. (All others are chirpers.) G. texensis tends to produce shorter, more regular trills than G. rubens, but where they occur together, the two can be distinguished reliably only by the pulse rates of their calling songs—after the rates have been adjusted for temperature. Even though the two species are (thus far) almost indistinguishable morphologically (Gray et al. 2001) and readily hybridize in the laboratory, they maintain their integrity in the field (Walker 1998, 2000).
More information:
Gryllinae, genus Gryllus
References: See genus page.
Nomenclature: OSF (Orthoptera Species File Online)
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