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Genus Oecanthus - Common Tree Crickets

Tree cricket - Oecanthus nigricornis - female Cricket - Species Is ... - Oecanthus niveus 4th stage instar Prairie tree cricket - nearly 5th stage - Oecanthus argentinus - male Juvenile common tree cricket - Oecanthus cricket - Oecanthus - male Oecanthus nigricornis - female Pine Tree Cricket  - Oecanthus pini - female Narrow-winged Tree Cricket - Dorsal - Oecanthus niveus - female
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)
ee - CAN - thus
Numbers lists 14 species.

Species in the U.S. are listed under four groups: nigricornis, niveus, rileyi and varicornis:
Nigricornis group: O. nigricornis, O. argentinus, O. forbesi, O. celerinictus, O. pini, O. laricis, O. quadripunctatus and O. walkeri
Niveus group: O. niveus, O. exclamationis, and O. leptogrammus
Rileyi group: O. rileyi, O. alexanderi and O. fultoni
Varicornis group: O. varicornis, O. californicus, O. latipennis and O. texensis.

Nigricornis species group
... Species argentinus - Prairie tree cricket
... Species celerinictus - Fast-calling tree cricket
... Species forbesi - Forbes' tree cricket
... Species laricis - Tamarack tree cricket
... Species nigricornis - Black-horned tree cricket
... Species pini - Pine tree cricket
... Species quadripunctatus - Four-spotted tree cricket
... Species walkeri - Walker's tree cricket
Niveus species group
... Species exclamationis - Davis' tree cricket
... Species niveus - Narrow-winged tree cricket
... Species leptogrammus - Thin-lined tree cricket
Rileyi species group
... Species alexanderi - Alexander's tree cricket
... Species fultoni - Snowy tree cricket
... Species rileyi - Riley's tree cricket
Varicornis species group
...Species californicus - Western tree cricket
... ... Subspecies californicus - pale or brown form
... ... Subspecies pictipennis - pictipennis form
... Species latipennis - Broad-winged tree cricket
... Species varicornis - Different-horned tree cricket
... Species texensis - Texas tree cricket
No Taxon Unidentified nymphs / instars
If you have found a green tree cricket in North America, it is in the genus Oecanthus.

Most North American species of Oecanthus can be identified by markings on the ventral surface of the first two antennal segments (1), see especially fig. 61 of that reference.

An online key to species is available here.

Examples of photos in guide with antennal markings:

1. Prairie Tree Cricket

2. Black-horned Tree Cricket

3. Four-spotted Tree Cricket

4. Pine Tree Cricket

5. Western Tree Cricket

6. Broad-winged Tree Cricket

7. Narrow-winged Tree Cricket

8. Davis' Tree Cricket

9. Snowy Tree Cricket

10. Riley's Tree Cricket

11. Forbes' Tree Cricket

12. Walker's Tree Cricket
Life Cycle
Undergo a paurometabolous development (Gradual Metamorphosis). Nymphs resemble small adults and gradually develop external wing buds. They live in the same habitat as adults, typically taking the same food.

Life cycle and rearing information can be found here.
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
Print References
Capinera et al., pp. 205-209 (1)
Internet References
http://oecanthinae Tree Crickets - information and photos
Works Cited
1.Field Guide To Grasshoppers, Katydids, And Crickets Of The United States
John L. Capinera, Ralph D. Scott, Thomas J. Walker. 2004. Cornell University Press.