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Genus Asagena

red and white steatoda - Asagena fulva - female Cobweb Spider - Asagena Cobweb Spider - Asagena 2 Spot Spider - Asagena americana - male 2-Spot Female - Asagena americana - female Asagena americana - male Asagena americana? - Asagena americana - male Cobweb Spider - Asagena fulva - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Theridiidae (Cobweb Spiders)
Genus Asagena
Synonyms and other taxonomic changes
Removed from Steatoda.
Explanation of Names
Author of the name: Sundevall. Year first published: 1833.
Numbers
4 species in Bugguide's range.
Identification
Females
A. americana -
A. fulva - Pattern stable, species abundant & widespread.
A. medialis - Pattern variable, golden orange carapace, abdomen is blackish above, a single median row of large dorsal spots (with small frontal paired ones often absent) separates this from the similar S. punctulata, longer legs in both sexes. Also easily mistaken for S. washona, but S. washona is a foothill/mountain species while A. medialis is a desert species.
A. pulcher - Relatively large spots of the middle line form a distinct band in average specimens, sometimes the white may take over the entire abdomen. Bright orange to dusky brown carapace with dusky radiating lines. Legs may show bands. Abdomen varies from reddish to black. The frontal spot is present, but never paired as in A. medialis.

Males
A. americana -
A. fulva - Pattern stable, species abundant & widespread.
A. medialis - Males resemble females but the spotting on the abdomen becomes indistinct in masculine males.
A. pulcher - Males usually have black abdomens with distinct narrow, dentate band running back to caudal end, but the side spots are usually reduced or missing.
Range
Exact distribution within these countries will be added when time permits.

Ranges from Gertsch, 1960. "...these discrete populations live in definite areas..."(1)
A. americana - USA, Canada
A. fulva - Widespread across the southern US & as far north as OR in the west (most common in southern CA & AZ)
A. medialis - Southwestern US including southern CA & AZ, UT)
A. pulcher - OR & CA

New Mexico State University lists ranges in their area as:
Asagena americana - AZ, NM
Asagena fulva - AZ, NM, TX
Asagena medialis - AZ, W TX
Asagena pulcher - W TX
Habitat
Dry habitats.
See Also
Steatoda Steatoda variata has a very similar pattern to some Asagena.
Works Cited
1.The fulva Group of the Spider Genus Steatoda
W.J. Gertsch. 1960. American Museum novitates ; no. 1982.