MILLIPEDS KEETON 57 



on the left side of the chart that has rounded paranota. It is inter- 

 esting to note that, in both body characters mentioned, plecta and 

 eutypa eutypa fail to agree with their group. This would appear to 

 be a secondary condition inasmuch as their gonopods definitely link 

 them with the separanda main group. 



The two species insolita and dentata obviously form a group to 

 themselves on the basis of the location of the cingulum. They are 

 believed to have diverged very early from the ancestral line of the 

 genus. 



No attempt has been made to show mendota in the phylogeny dia- 

 gram as it is so highly specialized that, at present, its relationships 

 are totally obscure to me. 



It is to be hoped that extensive collecting in the future will help to 

 clear up many of the perplexing questions indicated above. The 

 true and complete picture will doubtless never be known, but perhaps 

 in time the over-all trends can be established. If the purely speculative 

 suggestions made in this paper help to stimulate further inquiry, they 

 will have served their purpose. 



Literature Cited 



BoLLMAN, Charles H. 



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 Causey, Nell B. 



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pp. 165-170, 9 figs. 



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1950a. A collection of xystodesmid millipeds from Kentucky and Tennessee. 

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