I will do as you suggest and try to get an appraisal from someone at the AMNH, starting with James Carpenter. I can't do it until next week but I will then post whatever information I get in this thread. Thanks for the suggestion.
Charles

I contacted James Carpenter as you suggested and he referred me to
John Ascher, a Sphecid researcher at the AMNH. He (Ascher) had himself taken an Isodontia elegans earlier this year (also in Central Park) and there had been one taken in the Bronx just before that. There was a sight record by an extremely reliable observer two days after my photo was taken. It was at Battery Park City, about an equal distance from Central Park as the Bronx, but in the opposite direction.
He feels that there is an Isodontia elegans population in this area now and more will be found. He also thinks I. elegans is, and will remain, a valid species.
John said he had not yet published anything on this range extension but he will. It is up there on his "to do" list. He suggested that meanwhile I publish my record in the form of a note in one of the professional journals. I doubt if I will venture into this unknown area.
Thanks again for your suggestion and help.

I would say: go for it, write the brief report, there is nothing to it, just present the information in a straithforward manner, that is all.
Also, if you can, why don't you submit a close up of the Stresipteran here in bugugide so we can place it in that page? Or even resubmit this image and place in Stresipteran. Right now I am moving this images to the I. elegans page.