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PROCEEDINGS OF THE NATIONAL MUSEUM 



caudal aspect, set off by a much deeper constriction than in the other 

 known species of the genus (fig. 10,a). 



Discussion : This species ranks among the largest forms of the genus 

 and is very distinct from its smaller congeners in numerous structural 

 characters. No contribution can be made at this time to the knowl- 



FiGURE \0.—Arinolus torynophor, male topotype from Fish Creek, Arizona: a, right pos- 

 terior gonopod, caudal aspect; b, lower end of collum, left side. Arinolus apachellus, 

 male specimen from Sacaton, Arizona: c, right posterior gonopod, caudal aspect; d, 

 same, cephalomesial aspect; e, lower end of collum, left side. 



edge of variability or of distribution as only two specimens are known, 

 the holotype and a topotype, collected at Fish Creek by Loomis in 

 1924. Possibly A. torynophor will be eventually found to be endemic 

 to the Superstition Mountains of eastern Arizona. 



Arinolus apachellus Chamberlin 



Figure 10,c-e 

 Arinolus apachellus Chamberlin, 1941a, p. 10, figs. 12-14. 



Holotype: Male, collection of R. V. Chamberlin, from Covered 

 Wells (now called Quijotoa), Puna County, Arizona, collected on 



