The Moth Photographers Group: www.mothphotographersgroup.msstate.edu/MainMenu.shtml This is probably the most useful moth website on the internet since it covers all of North America and is based on visual retrieval.
The Moths of Southeastern Arizona: http://nitro.biosci.arizona.edu/zeeb/butterflies/mothlist.html
Noctuidae of North America: www.nearctica.com/moths/noctuid/noctuidae.htm
Southwest Moths: www.southwestmoths.org
Five Acres of Moths: www.fiveacresofmoths.org This is a splendid website. I highly recommend it to anyone with an interest in the phenology of Southwestern moths!
Symbiota Collections of Arthropods Network: https://scan-bugs.org/portal/index.php
Bold Systems: http://v3.boldsystems.org/
Discover Life Moth Project: http://www.discoverlife.org/moth/identification.html
The Lepidopterists’ Society: http://www.lepsoc.org/index.php
HOSTS, a Database of Lepidopteran Host Plants: http://www.nhm.ac.uk/research-curation/research/projects/hostplants/
Vascular Plants of the Gila Wilderness: http://www.wnmu.edu/academic/nspages/gilaflora/