THE MYGALOMORPH SPIDER GENUS A TYPO IDES 
(ARANEAE: ANTRODIAETIDAE)* 
By Frederick A. Coyle 
Biological Laboratories, Harvard University 
Introduction 
The genus Atypoides belongs to the mygalomorph spider family 
Antrodiaetidae, the remainder of which I am presently revising, and 
is closely related to the much larger genus Antrodiaetus . Atypoides 
was established by O. P.-Cambridge (1883) with his description 
of Atypoides riversi. Since then two additional species have been 
discovered. The genus is solely Nearctic and has a markedly dis- 
junct continental distribution, with two species in northern Cali- 
fornia and southern Oregon and one in southern Illinois and 
Missouri. Like the other species of antrodiaetids, those of A typoides 
live in tubular silk-lined burrows in the ground and nocturnally 
capture prey which come within reach of the burrow entrance. In 
the present revision Atypoides riversi is redescribed, the two new 
species are described, and the geographic variation of each species is 
analyzed. Information on the ecology, life history, and behavior of 
these species will be included in a future paper treating the entire 
family. 
Acknowledgements. I am indebted to Dr. H. W. Levi of the 
Museum of Comparative Zoology for encouragement and advice 
and to Dr. W. J. Gertsch of the American Museum of Natural 
History for his suggestion that I study this genus and for the large 
loan of A.M.N.H. material, much of which he himself has collected. 
Mr. J. A. Beatty, Mr. Patrick Craig, the California Academy of 
Sciences, and the University of Kansas have each loaned specimens. 
I am grateful to Prof. Varley of the University Museum of Oxford 
University, England, for the loan of the six syntypes of Atypoides 
riversi. Dr. W. H. Bossert of Harvard wrote the computer pro- 
grams employed in the analysis of variation. My wife, Judy, con- 
structed the distribution maps and helped cheerily with several other 
portions of the research. A National Science Foundation Graduate 
Fellowship and grants from the Evolutionary Biology Committee of 
Harvard University supported my field work during the summers 
of 1966 and 1967. Public Health Service Research Grant AI-01944 
to Dr. Levi helped defray some expenses. Publication is supported 
* Manuscript received by the editor June 12, 1968 
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