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Studies in Coccinellidae
By George H. Horn
Transactions of the American Entomological Society, vol. 22, 1895
Cite: 326129
Online: http://entomology.lsu.edu/lsam/horn/Horn255.pdf

Concentrates on Tribe Scymnini, with keys, descriptions, and external dorsal figures of the insects.

Limitations:
- Taxonomy outdated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: Coccinellidae) of the United States and Canada."(2)