Oecanthus spp? - Oecanthus

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Grasshoppers, Crickets, Katydids (Orthoptera) » Long-horned Orthoptera (Ensifera) » Crickets (Gryllidea) » True Crickets (Gryllidae) » Tree Crickets (Oecanthinae) » Common Tree Crickets (Oecanthus) » Nigricornis Group (Oecanthus Nigricornis Group)

Photo#567792

Copyright © 2011 David d'Entremont

Oecanthus spp? - Oecanthus -

Hamilton, Ontario - Royal Botanical Gardens Property, Hamilton-Wentworth, Ontario, Canada
August 17, 2011

Found in an open field amongst the goldenrod. After having captured it, I decided to leave it alone and see if it would call - which it did, giving a long, continuous call that is pretty distinctive of tree crickets (but which I find difficult to separate from other calls of similar species).

I've heard that the markings at the base of the antennae tend to be distinctive, so I have a couple of close-up shots (apologies for the fuzzyness, I don't have an 'actual' macro lens). Can anyone ID it based on these? I think it's in the Nigricornis group, and based on the markings alone, I would have guessed Oecanthus forbesi or O. celerinictus or something like that, but I have little experience with this genus.

Can anybody give me a positive ID?
Thanks - Dave

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Contributed by David d'Entremont on 24 August, 2011 - 8:53am
Last updated 24 August, 2011 - 8:09pm

Moved

Moved from ID Request. I agree with your ID into the nigricornis species group. I also lean toward O. forbesi -- but without knowing the pulses per second of the males song - at a plotted temperature -- it's hard to say with certainty whether it is O. forbesi, O. nigricornis or O. argentinus.

I have found O. forbesi in northern Wisconsin, and also in southern MI. They tend to have yellowish heads as in your photo.

… Wisconsin Oecanthinancy, 24 August, 2011 - 8:10pm

thanks!

Thanks for the help! I appreciate the confirmation and suggested species.

For future reference - if I were to record the song and temperature at time of singing, then could I tell for certain? Is there an online list somewhere of the species and their call pulses/second at different given temperatures?

… David d'Entremont, 25 August, 2011 - 12:24pm

Check out Dr. Walker's articles on SINA

http://entomology.ifas.ufl.edu/walker/buzz/s576a.htm

Walker TJ. 1962. The taxonomy and calling songs of United States tree crickets (Orthoptera: Gryllidae: Oecanthinae). I. The genus Neoxabea and the niveus and varicornis groups of the genus Oecanthus. Ann. Entomol. Soc. Am. 55: 303-322. [3439 KB]

Walker TJ. 1963. The taxonomy and calling songs of United States tree crickets (Orthoptera: Gryllidae: Oecanthinae). II. The nigricornis group of the genus Oecanthus. Ann. Entomol. Soc. Am. 56: 772-789. [6271 KB]

Walker TJ, Collins N. 2010. New World thermometer crickets: the Oecanthus riley species group and a new species from North America. Journal of Orthopera Research 19: 371-376.

… Wisconsin Oecanthinancy, 25 August, 2011 - 5:18pm

For easier use....

http://entomology.ifas.ufl.edu/walker/buzz/s576a.htm

… Wisconsin Oecanthinancy, 26 August, 2011 - 6:35pm

Terrific!

Thanks for the link and references! I really appreciate having them!!

… David d'Entremont, 26 August, 2011 - 7:52am

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