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Genus Synema

Crab spider? - Synema parvulum - female Spider - Synema Spider - Synema Spider - Synema Crab spider - Synema parvulum Crab Spider ID - Synema parvulum Crab Spider ID - Synema parvulum Crab Spider ID - Synema parvulum
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes)
Family Thomisidae (Crab Spiders)
Genus Synema
Identification
According to Gertch's (1939) keys to the species:

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

Synema globosum has its own distinctive appearance. See here and here.

Synema viridans has a green carapace and legs.

Synema neomexicana carapace uniformly dark brown, dorsum of abdomen grey to white (but the type specimen comes from Las Vegas).

Two others that are mentioned, but may no longer be acknowledged are:

Synema bicolor glistening black carapace and grey dorsum.

Synema obscurum carapace brown with pale dorsal stripe.
Internet References
Smithsonian Plate - Black and white drawings.