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Species Latrodectus variolus - Northern Black Widow

 
 
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Comparative Biology of American Black Widow Spiders
By B. J. Kaston
San Diego Soc. Nat. Hist. Trans. 16(3): 33-82, 1970
PDF with detailed descriptions, drawings & a few photos.

Link to http://archive.org.

American spiders of the genus Theridion (Araneae, Theridiidae)
By Levi, H. W.
Bulletin of the Museum of Comparative Zoology 129: 481-589, 1963
https://wsc.nmbe.ch/reference/3567

The North American spider genera Paratheridula, Tekellina, Pholcomma and Archerius (Araneae: Theridiidae)
By Levi, H. W.
Transactions of the American Microscopical Society 76(2): 105-115, 1957
https://wsc.nmbe.ch/reference/3240

A revision of the New World eximius lineage of Anelosimus
By Agnarsson, I.
Zoological Journal of the Linnean Society 146(4): 453-593, 2006
https://wsc.nmbe.ch/reference/10152

Spiders of the genus Euryopis from North and Central America (Araneae, Theridiidae)
By Levi, H. W.
American Museum Novitates 1666: 1-48, 1954
http://www.wsc.nmbe.ch/reference/3103

New spiders from Texas
By Willis J. Gertsch & L. Irby Davis
American Museum Novitates 881: 1-21, 1936

The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae)
By Herbert W. Levi
Bulletin Museum of Comparative Zoology, Harvard 121: 57-163, 1959

The spider genera Stemmops, Chrosiothes, and the new genus Cabello from America
By Herbert Levi
Psyche, Cambridge 71: 73-92, 1964

 
 
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