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fall field cricket

Gryllus pennsylvanicus Burmeister 1838

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map male male calling female
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female male genitalia Gryllus life cycles  
20 s of calling song; male from Dyer County, TN; 24.4°C. (WTL489-28)
11 s of courtship song; male from Worcester County, MA, 23°C. Recording by K. N. Prestwich, used by permission.
 Click on sound bar to hear graphed song.
Sound spectrogram of 2 s of calling at 24.4°C (from WTL489-28). Dominant frequency 4.7 kHz.
 Click on sound bar to hear graphed song.
Sound spectrogram of 2 s of courtship at 23°C (from the 11 s recording by K. N. Prestwich above).
Song: The soft, nearly continuous, shuffling sounds have a dominant frequency similar to the calling song (4.7 kHz) as do the two-pulse chirps with strong harmonics that are the loudest sounds. In contrast, the brief (10 ms), periodic ticks have their strongest frequencies at about 12 kHz. When courting a female, some males omit the two-pulse chirps in the terminal phase of a successful courtship; others do not.
Identification: G. pennsylvanicus and G. veletis cannot be reliably distinguished by either song or external morphology (although in some localities the ovipositors of G. pennsylvanicus average substantially longer than those of G. veletis). However, G. veletis overwinters as mid-to-late instar juveniles, whereas G. pennsylvanicus overwinters in the egg stage. Both species have only one generation per year. Consequently, G. pennsylvanicus adults are most abundant in fall and G. veletis adults are most abundant in spring. In all localities where the species have been studied, a few adults of the two species occur together in midsummer.
More information:
subfamily Gryllinae, genus Gryllus
References: See genus page.
Nomenclature: OSF (Orthoptera Species File Online)
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