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Genus Amaurobius

Amaurobiid - Amaurobius ferox - male Adult Male - Amaurobius borealis - male Black, Odd Spider- front view - Amaurobius ferox Coras? - Amaurobius ferox Black Lace-weaver - Amaurobius ferox - male Unknown Amaurobiidae - Amaurobius ferox - female Araneae - Amaurobius ferox - male Spider - Amaurobius ferox - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Amaurobiidae (Hacklemesh Weavers)
Genus Amaurobius
Synonyms and other taxonomic changes
Explanation of Names
Greek for 'living in the dark'.(1)
Numbers
There are 25 species in BugGuide's range:

Amaurobius agastus
Amaurobius barbaricus
Amaurobius corruptus
Amaurobius diablo
Amaurobius distortus
Amaurobius dorotheae
Amaurobius galeritus
Amaurobius hagiellus
Amaurobius heathi
Amaurobius intermedius
Amaurobius latescens
Amaurobius leechi
Amaurobius mathetes
Amaurobius mephisto
Amaurobius minutus
Amaurobius palomar
Amaurobius prosopidus
Amaurobius similis
Amaurobius tamalpais
Amaurobius transversus
Amaurobius triangularis
Amaurobius tulare
Amaurobius vexans
Identification
Typical abdominal patterns for the species not endemic to California:

A. borealis:
A. ferox:
A. similis:
Range
Except for A. borealis, A. ferox and A. similis, all species appear to to be limited to California.

Amaurobius agastus - Orange, Monterey, and San Diego counties CA.(2)
Amaurobius barbaricus - Type locality Santa Barbara Co., CA.(2)
Amaurobius borealis - Newfoundland west to British Columbia in Canada; Maine south to New York and west to Minnesota in the United States.(2)
Amaurobius corruptus - Holotype Monterey Co., CA.(2)
Amaurobius diablo - Alameda, Contra Costa, Solano, and Sonoma counties, CA.(2)
Amaurobius distortus - Holotype Tulare Co., CA.(2)
Amaurobius dorotheae - Tulare Co., CA.(2)
Amaurobius ferox - Holarctic(3) - Nova Scotia west to Ontario and Michigan, southwest to Illinois and east to Virginia.(2)
Amaurobius galeritus - Holotype Tulare Co., CA.(2)
Amaurobius hagiellus - Ventura Co.,CA.(2)
Amaurobius heathi - Monterey Co., CA.(2)
Amaurobius intermedius - Mendocino Co., CA.(2)
Amaurobius latescens - Coastal CA, from San Diego Co. north to Marin Co.(2)
Amaurobius leechi - CA(2)
Amaurobius mathetes - Alameda and Contra Costa counties, CA.(2)
Amaurobius mephisto - Holotype Contra Costa Co., CA.(2)
Amaurobius minutus - Holotype Mariposa Co., CA.(2)
Amaurobius palomar - San Diego Co., CA.(2)
Amaurobius prosopidus - Marin Co., CA.(2)
Amaurobius similis - Holarctic(3)
Amaurobius tamalpais - Marin and San Fransisco counties, CA.(2)
Amaurobius transversus - Holotype Monterey Co., CA.(2)
Amaurobius triangularis - Monterey Co., CA.(2)
Amaurobius tulare - Tulare Co., CA.(2)
Amaurobius vexans - Marin Co., CA.(2)
Remarks
Judging from images I receive for identification, males in this genus consistently wander in spring, rather than autumn, often showing up indoors.
Works Cited
1.Spiders of North America: An Identification Manual
D. Ubick, P. Paquin, P.E. Cushing and V. Roth (eds). 2005. American Arachnological Society.
2.A revision of the Nearctic Amaurobiidae (Arachnida: Araneidae)
Robin Leech. 1972. Memoirs of the Entomological Society of Canada 84: 1-82.
3.World Spider Catalog