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Genus Synema

Synema parvulum ? - Synema parvulum Small Crab Spider - Synema parvulum Type of Crab Spider - Synema parvulum Crab Spider for ID - Synema parvulum - female Unknown Spider - Synema parvulum - female Crab spider - Synema parvulum Green Spider - Synema viridans Black tail crab spider - Lateral - Synema parvulum
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.