20 s of calling song; male from Neshoba County, MS; 26.0°C. (WTL479-12)
5 s of courtship song; male from Austin, TX. [Recording by D. A. Gray; used by permission.]
Click on sound bar to hear graphed song.
Sound spectrogram of 2 s of calling at 26.0°C (from WTL479-12). Dominant frequency 4.8 kHz.
This species was long but wrongly known as G. integer. The real G. integer is a western species that is less similar to "Texas integer" (now G. texensis) than is G. rubens. In fact, males of G. texensis and G. rubens are thus far impossible to distinguish morphologically. Some females can be identified by the lengths of their ovipositors (Gray et al. 2001). The calling songs of G. texensis usually have shorter, more regular trills than those of G. rubens, but in places where both species occur, the only way to reliably distinguish their songs is by their pulse rates—after the rates have been adjusted for temperature effects. Even though the two species readily hybridize in the laboratory, they maintain their integrity in the field (Walker 1998, 2000).