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Genus Eris

Jumping Spider 12 - Eris jumping spider - Eris militaris Pelegrina? - Eris militaris - male Jumper for ID - Eris - female Pelegrina or Eris? - Eris - male Any way to know which Eris this is? - Eris 3014893 Salticid - Eris jumping spider - Eris
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Salticidae (Jumping Spiders)
Genus Eris
Synonyms and other taxonomic changes

Eris C.L. Koch, 1846
Explanation of Names
Eris is Greek (Ερις, meaning "strife", or "discord") and was goddess embodying strife, discord, and rivalry (Wikipedia--Eris (mythology), Theoi Greek Mythology--Eris). The goddess Eris was associated closely with Enyo ("horror" or "warlike"), whose name was bestowed upon a sphinx moth.
Numbers
4 species in bugguide's range: flava, floridana, militaris & rufa.(1)
Identification
Eris flava males typically shows a white band below the eyes that other Eris males do not.


See notes on distinguishing E. floridana from E. rufa here.

Male palps (left to right):
E. flava, E. floridana, E. militaris, E. rufa
See Also
Pelegrina - Eris has proportionately smaller palps, and a carapace that's more robust compared to Pelegrina. Also, I don't think any Eris have white scales under the ALE. Overall size is probably the easiest way to tell the difference. Once you've seen both genera you'll wonder how you ever got them mixed up.
… Jay Barnes, 17 February, 2008 - 12:54pm

I believe most (or all) male Pelegrina also have white scales beneath the ALE.
… Jay Barnes, 10 December, 2005 - 9:56am