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Black-horned Tree Cricket - Oecanthus forbesi - female

Black-horned Tree Cricket - Oecanthus forbesi - Female
Lake in the Hills Fen Nature Preserve, McHenry County, Illinois, USA
September 20, 2008

Images of this individual: tag all
Black-horned Tree Cricket - Oecanthus forbesi - female Black-horned Tree Cricket - Oecanthus forbesi - female

Moved from Black-horned Tree Cricket.

The degree of black on these two species (O. forbesi and O. nigricornis) can vary greatly, and the antennal markings also vary within their own species. Apparently the only way to know for certain which is which is by the pulse rate of the song of a male at a known temperature.

Regarding the difficulty in separating O. nigricornis from O. forbesi based on photographs: A gal who has done extensive studying of tree crickets (including song analysis, mating trials, and DNA sequencing) once wrote to me: In the eastern United States, I have found O. nigricornis, but not O. forbesi (in NJ and three sites in NY). In Ohio, I have found both O. forbesi and O. nigricornis in the same field, although the sites where I have found this have been in eastern Ohio (Akron and Canton). In central Ohio (Columbus area) and west from there, I have found O. forbesi but not O. nigricornis (OH, IL, WI, MI, IN, SD).

It's probably wise to use this broad range for now in separating the two species. Unless something is clearly outside the area encompassing the states of OH, IL, WI, MI, IN, SD -- photos should probably go in the nigricornis vs forbesi taxon page.

Nice photo, Tom
Is there anyway that you could zoom in on the base of the ovipositor? I'm curious whether there is a spermatophore there. Even if it's just the tip of her abdomen with a rounded appearance, it looks like you also have a nice view of the copulatory opening.

Does that work?
Does that work?

Actually I was more interested in the base of...
the ovipositor and the distal portion of the abdomen (where it looks dark)...that's where the copulation opening is. BUT please leave this shot of the ovipositor in -- it'll be a nice thumbnail when I eventually work on the guide pages for each species.

This photo is being used on the Oecanthinae Info page.

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