Body length of female = 7.4-8.7 mm; of male 6-6.5 mm. (1)
New England south to Virginia and west to the Pacific Coast and British Columbia. (1)
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
- Image, information, and detailed description.