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Genus Trachelas

black spider w/ orange legs - Trachelas Trachelas - Trachelas tranquillus - female Trachelas tranquillus - female Spider - Trachelas tranquillus Broad-Faced Sac Spider - Trachelas tranquillus Another Trachela tranquillus? - Trachelas tranquillus Trachelas Tiny spider - Trachelas
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Trachelidae
Genus Trachelas
Synonyms and other taxonomic changes
Placed in family Trachelidae in 2014, though I am unsure how much agreement there is on that change.
Numbers
8 species in the U.S.
Identification
Species in this genus look largely similar to each other, so in areas where more than one species can be found, identification via the genitalia is usually required.
Range
Ranges are from Platnick and Shadab, 1974. (1)

T. huachucanus - Arizona, New Mexico.
T. mexicanus - Utah and Colorado south through Arizona, New Mexico, and Texas.
T. organatus - Arizona, Sonora, and Baja California.
T. pacificus - Range is Western North America from California and Nevada south to northern Baja California. This is the only species listed for CA by Steve Lew's site.
T. similis - Southeastern United States south to Costa Rica.
T. sinuosus - Southern Georgia and Florida.
T. tranquillus - New England south to Georgia and Alabama and west to Kansas and Minnesota. Also found in Ontario and Nova Scotia, Canada.
T. volutus - Southeastern United States.
Print References
digitallibrary.amnh.org - Platnick and Shadab, 1974, A revision of the bispinosus and bicolor groups of the spider genus Trachelas (Araneae, Clubionidae) in North and Central America and the West Indies.
Works Cited
1.A revision of the tranquillus and speciosus groups of the spider genus Trachelas in North and Central America
Platnick, Norman I.; Shadab, Mohammad Umar. . 1974. American Museum novitates ; no. 2553.