432 
Psyche 
[September-December 
I hope that these studies of Aliatypus will stimulate others to 
investigate these fascinating spiders. Considerably more collecting 
is necessary before Aliatypus systematics can be confidently under- 
stood. As pointed out in the discussions of variation, small sample 
sizes and sizeable geographic gaps from which no samples are avail- 
able have greatly limited the strength of some of my conclusions. 
The variation discussions, locality records, and distribution Maps 2-4 
(Map 4 marks the distribution of unidentifiable Aliatypus speci- 
mens.) should help direct future collecting efforts. 
Acknowledgements 
Willis Gertsch first recognized the potential diversity within 
Aliatypus and suggested that I revise the genus. Wendell Icenogle 
deserves tremendous credit for the hours he labored collecting about 
55 percent of the specimens upon which this study is based. He was 
the first collector of five new species. Without his field work this 
study would be very incomplete. Jim Horton, my department head 
during most of this research, provided needed space and release time. 
I thank the following individuals and institutions for loans of 
Aliatypus specimens: William Azevedo, Michael Bentzien, Patrick 
Craig, Willis Gertsch (American Museum of Natural History), 
Wendell Icenogle, Herbert Levi (Museum of Comparative Zoology), 
Patrick Marer, Robert Schick (California Academy of Sciences), 
and Mel Thompson. This research and its publication have been 
supported by a grant (GB-34128) from the National Science 
Foundation. 
Evolution 
PHYLOGENY 
Aliatypus Antrodiaetus, Atypoides , the Mecicobothriidae, and 
the Atypidae form a distinct monophyletic taxon (Coyle, 1971). 
Aliatypus is probably an old group, so that the details of its relation- 
ship to these other atypoid mygalomorph taxa are not now clear. 
The question of whether Aliatypus is more closely related to Antro- 
diaetus and Atypoides or to the mecicobothriids was discussed earlier 
(Coyle, 1971), but will remain unresolved until after the completion 
of a careful comparative study of all atypoid mygalomorphs. 
In Figure 1 I have presented a hypothetical phylogeny of the 
genus Aliatypus. This speculation is based upon a comparison of 
character states in living Aliatypus species and related genera. It is 
