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Species Megatibicen pronotalis - Walker's Cicada

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Watson L., Dallwitz M.J. (2003-) British Insects
regularly updated, sound, succinct general info on each family represented in the UK, mostly applicable to nearctic fauna
[cite:589929]

Oak pests: A guide to major insects, diseases, air pollution and chemical injury, by J.D. Solomon et al.
useful fact sheets here
[cite:588843]

Photo gallery of the Spencer Entomological Collection
[cite:553835]
quality photos of selected representatives of northwestern fauna, incl. a number of type specimens; some sections (e.g., Aradidae) are very helpful; the list of their imaged Heteroptera here includes about a hundred spp. that we don't have yet among Alydidae, Anthocoridae, Aradidae, Corixidae, Cydnidae, Gerridae, Oxycarenidae, Saldidae, Scutelleridae, Tingidae... (they haven't yet posted several major families), and the beetle section, with ca. 3000 identified spp. (list), seems to be at least as much impressive.

Digital key to aquatic insects of North Dakota
illustrated keys down to family put together by Dr. DeLorme's macroinvertebrate lab at Valley City State U.
[cite:515916]

What Bug Is That? The guide to Australian insect families
excellent resource filled with very sound information, incl. profile pages of taxa down to family level
[cite:489472]

Biological control: A guide to natural enemies in North America
[cite:489323]
Individual fact sheets authored by different experts.
Parasitoids | Predators | Weed-feeders

CU Museum of Natural History entomology databases & research tools
[cite:472187]
CU = University of Colorado at Boulder
Insects species list includes names only; there are separate databases for Orthoptera and bees

NCSU insect collection species inventory database
[cite:368979]
the resource seems to be unavailable as of Nov 2016

a helpful source, esp. to check NC state records; used to cover >21,000 species, but (i) the taxonomy was quite outdated in many cases, and (ii) the source was not a complete checklist of NC fauna, either, as it did not cover data from other institutional or private holdings

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