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Species Zygiella x-notata

Spider - Zygiella x-notata Zygiella x-notata - female Z. x-notata - Zygiella x-notata - male spiders found in zoo around building lights - Zygiella x-notata - female spiders found in zoo around building lights - Zygiella x-notata - female Orbweaver - Zygiella x-notata Another nearby Cross spider - Zygiella x-notata - female Spider - Zygiella x-notata
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Araneidae (Orb Weavers)
No Taxon (Parazygiella / Zygiella)
Genus Zygiella
Species x-notata (Zygiella x-notata)
Size
Body length of female = 7.4-8.7 mm; of male 6-6.5 mm. (1)
Range
New England south to Virginia and west to the Pacific Coast and British Columbia. (1)
Remarks
Introduced from Europe.

If it's found on a structure it's more likely Z. x-notata than Z. atrica.

Rod Crawford says "Which species can't be told from color alone. Z. x-notata and Z. atrica occur in urbanized habitats, the former on buildings and the latter on trees. Z. dispar is found in natural forest."
… 15 June, 2008
Internet References
delta-intkey.com - Illustrations.
wiki.britishspiders.org.uk - Image, information, and detailed description.
Works Cited
1.How to Know the Spiders
B. J. Kaston. 1978. WCB/McGraw-Hill.