158 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Arinolus nogalanus Chamberlin 



Arinolus nogalanus Chamberlin, 1941a, p. 11, fig. 15 (male holotype in the Cham- 

 berlin collection, from Nogales, Santa Cruz County, Arizona, collected on 

 December 30, 1941, by Stanley and Dorothea Mulaik). 



Arinolus latus Loomis 



Arinolus latus Loomis, 1953, p. 418, figs. 10-12 (male holotype, USNM 2090, from 

 Antelope Valley, between Lancaster and Palmdale, Los Angeles County, 

 California, collected on January 8, 1928, by O. F. Cook). 



Arinolus pimus Chamberlin 



Arinolus pijnus ChamberHn, 1941a, p. 12 (female holotype in the Chamberlin 

 collection, from Litchfield Park, Maricopa County, Arizona, collected on 

 December 26, 1940, by Stanley and Dorothea Mulaik). 



Arinolus chiricahuanus Chamberlin 



Arinolus chiricahuanus Chamberlin, 1947b, p. 50, figs. 56-58 (male holotype. 

 Acad. Nat. Sci. Philadelphia 9973, from White Tail Canyon, Chiricahua 

 Mountains, Cochise County, Arizona, collected in 1906 by H. A. Pilsbry 

 and S. H. Ferris). 



Arinolus hospes (Cook) 



Onychelus hospes Cook, 1911, p. 157 (holotype, a possibly immature female, 

 USNM 803, from Tucson, Pima County, Arizona, collected on December 

 23, 1896, by H. G. Hubbard). 



Arinolus hospes Loomis, 1950, p. 164. 



Loomis suggested that 0. hospes is a senior synonym of A. hopinus 

 Chamberliii, which was also based on material from Tucson. In view 

 of the external similarity of arinolines and the fact that two species 

 can occm- together, it seems best to keep the two names separate for 

 the time being. 



Arinolus dentatus (Cook) 



Onychelus dentatus Cook, 1911, p. 158 (female holotype, USNM 804, from Fort 

 Huachuca, Cochise County, Arizona, collected by T. E. Wilcox). 



Onychelus suturatus Cook, 1911, p. 159 (female holotype, USNM 805, with the 

 same type locahty and collector as the preceding). 



Arinolus dentatus Loomis, 1950, p. 164. 



These two names are probably based upon the same species, the 

 differences stipulated by Cook apparently due to either age or recent 

 moulting by the type of suturatus. 



Genus Piedolus Chamberlin 



Piedolus Chamberlin, 1930, p. 117. 



Type species: Piedolus utus Chamberlin, by original designation. 



Diagnosis: An arinoline genus characterized chiefly by the soleno- 

 merite of the posterior gonopods, which is very long and slender, 



