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For the United States & Canada
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Genus Oecobius - Wall spiders

Small Spider - Oecobius Oecobius O. navus female - Oecobius navus - female Oecobius cellariorum - male Unknown small outdoor spider - Oecobius O. isolatus female - Oecobius maculatus - female Oecobius Oecobius - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Oecobiidae (Wall spiders)
Genus Oecobius (Wall spiders)
Synonyms and other taxonomic changes
Explanation of Names
Greek oikos (οικος)- "house" + bios (βιος)- "living"

'Living in the house'(1)
Seven species in US.(1) Two additional species have been introduced recently.
From Shear 1970:(2) Ranges have likely expanded for some of these species since then due to their synanthropic nature
O. concinnus - southern FL
O. cellarorium - AZ, NM, TX, OK, NB, MO, AR, KY, NC, VA, WV, MD
O. interpellator - MA
O. isolatus - southern CA, AZ, Mexico
O. isolatoides - AZ, Mexico
O. navus - OR, CA, AZ, TX, LA, MS, AL, FL, KY, NY, MA, Mexico
O. putus - southern CA, AZ, NM, western TX, Mexico

Introduced species:
O. amboseli - BugGuide has photos from BC
O. annulipes - one BugGuide specimen from CO
O. maculatus - BugGuide has photos from CA, AZ
houses, stucco walls, under bark on trees and grape vines, rocks
ants, other small insects
Very small spiders that make flat webs on walls and similar surfaces. The spider rests underneath the web.
Print References
Link to 1970 revision of genus by Shear is on p. 129 - here.
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.The spider family Oecobiidae in North America, Mexico, and the West Indies
William A. Shear. 1970. Bulletin of the Museum of Natural History Harvard 140(4): 129-164.