Species Sasajiscymnus tsugae
Studies in CoccinellidaeBy George H. Horn
Transactions of the American Entomological Society, vol. 22, 1895
Concentrates on Tribe Scymnini, with keys, descriptions, and external dorsal figures of the insects.
- Taxonomy outdated
- No figures of appendages or internal anatomy.
What makes up for limitations:
- More-detailed keys and descriptions and more dorsal figures of Tribe Scymnini species than in Gordon's 1985 "The Coccinellidae (Coleoptera) of America North of Mexico."(1)
- Available free online, unlike Gordon's 1976 "The Scymnini (Coleoptera
Ladybugs of AlbertaBy John Acorn
University of Alberta Press, 169 pages, 2007
-states that it is the first field guide on Ladybugs of any region of North America...
-covers 75 species found in Alberta, many of which are also widespread across the continent
-Colour plates at beginning of book illustrated by author are very useful, often showing variation within a species
-While it could have been edited rather more tightly, I still find this book to be very useful and It has helped me ID quite a few species in a region more than a thousand miles away...And while the author gets a little deeply into the debate of whether or not "invasive", exotic" or otherwise imported species are useful, beneficial, harmful, etc, this book still has loads of useful information, including lots of easily readable stuff on natural history, collecting techniques and so on...I would give it an enthusiastic "two thumbs up"!
Larval key to Genera and selected Species of North American Cocinellidae (Coleoptera)By Rees, B. E., Anderson, D. M., Bouk, D., and Gordon, R. D.
Proceedings of The Entomological Society of Washington, vol. 96(3), pp. 387-412, 1994
"Abstract - An illustrated key to the larvae of 46 of the 60 genera of North American Coccinellidae is presented." (including all genera currently represented in BugGuide) Fourteen genera are not yet understood sufficiently to include.
Paper includes many detailed figures of overall habitus and structures necessary for keys including; head and mouthparts, antennae, body structures and armature types.
The Scymnini (Coleoptera: Coccinellidae) of the United States & Canada: Key to genera and revision of Scymnus, Nephus, & DiomusBy Robert D. Gordon
Bulletin of the Buffalo Society of Natural Sciences, Buffalo, NY, Vol 28, 1976
While Gordon's 1985 work, "The Coccinellidae (Coleoptera) of America North of Mexico" (ref (1)
) does contain keys, illustrations, and distribution maps for all species, for "detailed description and discussion" for Scymnini the reader is referred to this earlier work.
As of 2006, copies were still available from the publisher.
Phylogeny and classification of Cucujoidea and the recognition of a new superfamily Coccinelloidea (Coleoptera: Cucujiformia)By Robertson J.A., Ślipiński A., Moulton M., Shockley F.W., Giorgi A., Lord N.P., McKenna D.D., Tomaszewska W., Forrester J. ...
Syst. Entomol. doi: 10.1111/syen.12138, 2015