Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Small Western Araneus: A Habitus-based Guide

The following spiders are found in the western US Information is largely from Levi's 1973 bulletin.

These first three are found in both the eastern & western US.
A. detrimentosus -

A. pegnia - Mass. to Indiana, common in the SE US; in the south west to the Los Angeles area.
* Carapace & legs yellow-brown. Legs sometimes banded; male second tibia with strong macrosetae. Dorsum of abdomen with anterior dorsal white mark, wider than long (like the shape of a butterfly), framed by black. Three to four pairs of black transverse lines, the posterior ones just being a black spot. Some red pigment above the dorsal white mark and some green on sides and posteriorly. Male the same but adbominal black spots much less distinct or absent. Amount of red and green may vary. Female pattern is diagnostic.

A. thaddeus - Common in the Eastern US, but rare on the Gulf Coast & FL.
* Carapace, sternum, legs golden yellow. Distal articles of legs with some bands; male second tibia slightly curved with macrosetae, and with a green spot under each femur. Dorsum of abdomen whitish with 5 pairs of dark brown spots that are farther apart anteriorly than posteriorly. Sides of abdomen blackish brown. According to Comstock the dorsum varies from yellowish to pink or purple. Male coloration much the same except carapace darker in the center and almost no dark pigment on abdomen, the lateral bands are indistinct.

A. allani

A. cochise

A. mammatus

A. arizonensis

A. chiricahua

A. groenlandicola

Found only in CA

A. bispinosus

A. mariposa

A. montereyensis

A. monica