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Nigricornis Group

tree cricket nymph - Oecanthus nigricornis - male 5015796 - Oecanthus forbesi - female Oecanthus - male Oecanthinae - dorsal - Oecanthus - female Life Cycle of Oecanthus walkeri - Oecanthus walkeri - male Tree Cricket - Oecanthus sp - Oecanthus nigricornis - male cricket - Oecanthus nigricornis - male Tree Cricket resting on Queen Anne's Lace - Oecanthus nigricornis - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Orthoptera (Grasshoppers, Crickets, Katydids)
Suborder Ensifera (Long-horned Orthoptera)
Infraorder Gryllidea (Crickets)
Family Gryllidae (True Crickets)
Subfamily Oecanthinae (Tree Crickets)
Genus Oecanthus (Common Tree Crickets)
No Taxon Nigricornis Group
Range
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.
Remarks
A great source for 'everything you ever wanted to know about tree crickets' is an article written in May 1915 by Bentley B. Fulton in a Technical Bulletin for the New York Agricultural Experiment Station. The Tree Crickets of New York: Life History and Bionomics