[Odonata-l] Clubtail ID help - large picture size

[Tommy Springer]

I am having some problems identifying this clubtail species.  I have narrowed my guesses down to a couple species, but I will not mention them so as not to bias anyone else's opinion.  I apologize for the large file size of the pictures, but I didn't want to sacrifice the quality of the images in case anyone wanted to zoom in on any certain feature.
 
This specimen was captured June 11, 2007 on Big Darby Creek in Prairie Oaks Metro Park, Franklin County, Ohio.  It was subsequently released after the photographs were taken, so unfortunately they are all I have to go by.  Any help on this specimen would be greatly appreciated, if not for any other reason that to expand my own cranial database.
 
Noted behavior: This dragonfly made intermittent passes along a boulder-strewn run above a riffle, and would pause occasionally, hovering about 2-3' above the water.
 
Thanks again for any help,
 
Tom Springer
 
 
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