Female Araneus andrewsi generally measure 11-22mm. The carapace is brown and darker on the sides. The abdomen has a pair of anterior humps and is tan to black in coloration. It also has a folium. The total length of males is 8-11mm. Although their color and appearance is similar to the female, males are perhaps not as robust. As in most araneids final diagnosis should rely on an inspection of the genitalia.
Range and Habitat
Araneus andrewsi occurs along the west coasts of Oregon, California and northern Baja California. These spiders can be found in a variety of situations and habitats. They have been observed in basements and on walls, boulders, and large tree trunks.
Related and Similar Species
Similar in size to Araneus gemma but Araneus andrewsi can be distinguished on basis of color pattern and genitalia.
Levi, H.W. 1971. The diadematus group of the orb-weaver genus Araneus north of Mexico (Araneae: Araneidae). Bull Mus. Comp. Zool. 141(4):131-179