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Species Latrodectus hesperus - Western Black Widow

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A key and checklist of American spiders of the family Theridiidae north of Mexico (Araneae)
By Herbert W. Levi & Diane E. Randolph
The Journal of Arachnology 3: 31-51, 1975

The genera of the spider family Theridiidae
By Herbert W. Levi & Lorna R. Levi
Bulletin Museum of Comparative Zoology Harvard 127: 1-71, 1962

The spider genera Coressa and Achaearanea in America north of Mexico (Araneae, Theridiidae)
By Herbert W. Levi
American Museum Novitates 1718: 1-33, 1955

Cosmopolitan and pantropical species of theridiid spiders (Araneae: Theridiidae)
By Herbert W. Levi
Pacific Insects 9: 175-186, 1967

American spiders of the genus Achaearanea and the new genus Echinotheridion (Araneae, Theridiidae)
By Herbert W. Levi
Bulletin Museum of Comparative Zoology Harvard 129: 187-240, 1963
Full text at the Biodiversity Heritage Library: http://biodiversitylibrary.org/page/4269668

The spider genera Steatoda and Enoplognatha in America (Araneae, Theridiidae)
By Herbert Levi
Psyche, Cambridge 69: 11-36, 1962

The fulva Group of the Spider Genus Steatoda
By W.J. Gertsch
American Museum novitates ; no. 1982, 1960

American spiders of the genera Audifia, Euryopis, and Dipoena (Araneae: Theridiidae)
By H.W. Levi
Bulletin of the Museum of Comparative Zoology, 129 (2): 121-185, 1963
Online here.

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