Insects of Western North America 8 The Checkered Beetle Genus Trichodes Herbst (Coleoptera: Cleridae): a pictorial key to North By West, Daniel R Colorado State University, 2014 Cite: 1093272 with citation markup [cite:1093272]
Should be handy, pictures capture the intraspecific variation rampant in some species.
Contributions of the C.P. Gillette Museum of Arthropod Diversity Insects of Western North America
Colorado State University. Department of Bioagricultural Sciences and Pest Management.
C.P. Gillette Museum of Arthropod Diversity.
Free full text here. Paste link.
http://digitool.library.colostate.edu/R/?func=dbin-jump-full&object_id=281052
The ISBN on this publication (1084-8819) is the same one used on Dan Heffren's Cerambycidae of Colorado publication.
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