12 s of calling song, Washington County, Ohio, 25.0°C. (WTL194-14)
20 s of calling song, 4 caged males from Livingston County, Michigan, 16.3°C. Peak frequency kHz (12). (WTL194-10b)
This waveform is a 5 s excerpt of the 20 s audio file accessible above. Click on waveform to expand last two syllables.
Song at 25°C:
A continuous series of lisps at a rate of 10 per second, sounding like a distant, fast-moving steam locomotive (to those who are old enough to remember). A distinctive song. At low temperatures, neighbors synchronize their lisps.
Length 45-55 mm for males; 52-64 mm for females. Cone with pinched-in sides and a lower surface edged in black; stridulatory vein long and weakly swollen.
Similar species:
N. caudellianus is larger and its cone is thicker, with sides less distinctly pinched in. N. nebrascensis and N. lyristes have the lower surface of the cone wholly black or nearly so and stridulatory vein thicker and with more pronounced subsidiary veins.
