Rocky Mountain Clearwing (Hemaris thetis) is a large, thick-bodied moth in the Sphinx Moths (Sphingidae) family. It is found west of the Continental Divide in Colorado to the Pacific Coast, and north through British Columbia, Canada.
Moth Photographers Group: https://mothphotographersgroup.msstate.edu/species.php?hodges=7855.1
Butterflies and Moths of North America (only shows rangemap) https://www.butterfliesandmoths.org/species/Hemaris-thetis
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In California, there are about 240 species of butterflies. There are more than 3,000 species of MOTHS, which represent 4 suborders in about 50 families. Butterflies have clubbed antennae, moths do not. Many moths are nocturnal, but not all.
MOTH and CATERPILLAR (General references):
Field Guide to California Insects, by Kip Will, J. Gross, D. Rubinoff , J. Powell, 2nd ed., 2020 (Lepidoptera, pp. 347-426)
BugGuide: Butterflies and Moths (U.S. and Canada) clickable categories or use search bar: https://bugguide.net/node/view/57
Moth Photographers Group https://mothphotographersgroup.msstate.edu/species.php?hodges=7872&state=CA
(Be sure to limit the interface to California. The website is a little clunky but it’s better set up for moth taxonomy than BugGuide)
Glossary of Butterfly (and Moth) Terminology: https://butterfly.ucdavis.edu/resources/glossary
Caterpillar Anatomy Diagram and Butterfly/Moth Basics: https://www.enchantedlearning.com/subjects/butterfly/activities/printouts/caterpillarprintout.shtml Life Cycle of a Butterfly: Egg --> Larva (the caterpillar) --> Pupa (the chrysalis or cocoon) --> Adult.
Butterflies and Moths of North America https://www.butterfliesandmoths.org/species_search
Geometer Moths (Geometridae family) in Monterey County: checklist with photos compiled by INat Kueda https://www.inaturalist.org/check_lists/260565-Geometridae-of-Monterey-County--CA--US?page=2
Caterpillars: INaturalist Project https://www.inaturalist.org/projects/california-caterpillars
Moths of Western North America by Jerry A. Powell and Paul A. Opler, 2009 (in-depth, technical, some photos)
Wagner's Caterpillars of Western North America (coming soon) "1450+ species accounts in progress" INat thebals 6/6/23.