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Genus Synema

Crab Spider ID - Synema parvulum Black-tailed Crab Spider (Synema parvulum) - Synema parvulum - female Small Crab Spider - Synema parvulum Brown Striped Crab - Synema parvulum Green Spider - Synema viridans Crab Spider - Synema parvulum Synema viridans male mature - Synema viridans - male Tiny spider - Synema parvulum - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Thomisidae (Crab Spiders)
Genus Synema
3 species found in North America.
According to Gertch's (1939) keys to the species: (Only neomexicana, parvulum & viridans are found in North America)

Synema neomexicana carapace uniformly dark brown with a narrow white seam, dorsum of abdomen grey to white (but the holotype female, which is the only known specimen, is from Las Vegas).

Synema parvulum Abdomen with a large dark caudal maculation, otherwise pale. Eyes of anterior row nearly straight. Carapace light brown.

Synema viridans has a green carapace and legs, abdomen without maculation.
Synema neomexicana - collected in Nevada and New Mexico.
Synema parvulum - southern United States, occasionally north to southern New Jersey.
Synema viridans - southeastern United States; Texas; Iowa.
(these ranges taken from Gertsch 1939b(1))
Print References
Gertsch, W. J., 1939b. A revision of the typical crab spiders (Misumeninae) of America north of Mexico. Bull. Amer. Mus. Nat. Hist. 76: 277-442. [online version available, see here]
Internet References
Smithsonian Plate - Black and white drawings.
Works Cited
1.A revision of the typical crab spiders (Misumeninae) of America north of Mexico
Willis J. Gertsch. 1939. Bulletin of the American Museum of Natural History 76: 277-442.