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Genus Ummidia

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Results of the Yale Peruvian Expedition of 1911. The Arachnida.
By Ralph Chamberlin
Bulletin of the Museum of Comparative Zoology Harvard 60: 177-299, 1916

The spiders of Quebec: update, additions and corrections
By Pierre Paquin & Nadine Dupérré
Zootaxa 1133: 1-37, 2006
Not currently available for free download online (must have Zootaxa subscription).

Miscellaneous new American spiders
By Chamberlin, R. V. & W. Ivie
University of Utah 26(4): 1-79, 1935
Full text available in USpace, University of Utah's reference system.

Collins Field Guide: Spiders of Britain & Northern Europe
By Michael J. Roberts
Harper Collins, London, 383 pp., 1996
This is actually Roberts 1995 in the World Spider Catalog. The year might have been a typo?

This is a great book to have; 450 species are covered, each with genitalia illustrations, and 288 of them include a color painting. We have lots of European imports here and they can usually be found in this book.

Notes on spiders from southeastern Utah
By Ralph Chamberlin & Willis Gertsch
Proceedings of the Biological Society of Washington 41:175-188, 1928
Full text at the Biodiversity Heritage Library

Descriptions of the Araneae collected in Colorado in 1875, by A. S. Packard Jr., M.D
By Tamerlan Thorell
Bulletin of the United States Geological Survey 3:477-529, 1877
Full text at the Biodiversity Heritage Library

Descriptions and figures of the araneides of the United States
By Nicholas Hentz
Boston Journal of Natural History 6:18-35, 271-295, 1850
Full text at the Biodiversity Heritage Library

Spiders of the Chiricahua Mountain area, Cochise Co., Arizona
By Albert Jung & Vincent Roth
Journal of the Arizona Academy of Science 9(1):29-34, 1974
One way to read it online is through JSTOR (you have to register for a free account and then put the paper on your book shelf) - However, if you want a downloadable PDF, you have to purchase it (or ask around for a copy).

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