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- Taxonomy outdated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