MILLIPEDS OF NORTH AMERICA 165 



Type Locality: Claremont, Los Angeles County, California. 

 Range: Known only from type locality. 



Hiltonius thebanus Chaniberlin 



Hiltonius thebanus Chamberlin, 1941, Bull. Univ. Utah, biol. ser., vol. 6, 



No. 4, p. 8, fig. 7. 

 Type: Collection of R. V. Chamberlin. 

 Type Locality: Theba, Maricopa County, Arizona. 

 Range: Known only from type locality. 



Genus NARCEUS Bafinesq[ue 



Narceus Rafinesque, 1820, Annals of nature, p. 9. — Hoffman and Crabill, 

 1953, Florida, Ent., vol. 36, p. 80. 



Rhexenor Rafinesque, 1820, Annals of nature, p. 9 (generotype: R. 

 annularis Rafinesque, by monotypy) . 



Spirobolus (not Brandt) Wood, 1865, Trans. Amer. Philos. Soc, new ser., 

 vol. 13, p. 207.— Bollman, 1893, U. S. Nat. Mus. Bull. 46, p. 118.— 

 Brolemann, 1914, Ann. Soc. Ent. France, vol. 83, p. 31. — Chamber- 

 lin, 1947, Proc. Acad. Nat. Sci. Philadelphia, vol. 99, p. 44. 



Arctobolus Cook, 1904, in Harriman Alaska Exped., vol. 8, p. 64 (genero- 

 type: A. onandaga Cook). 



Generotype : Narceus tinctorius Rafinesque, by monotypy. 



Range: North America east of the Great Plains. The entirely provi- 

 sional statement of ranges in this genus must be emphasized. Many of the 

 names admitted to this list will doubtless fall as synonyms when adequate 

 studies have been made. 



Species: Fourteen. 



Narceus americanus (Beauvois) 



Julus americanus Beauvois, 1805, Insectes recueillis en Afrique et Amer- 

 ique, . . . , Apteres, pi. 4, figs. 3a-c (the name "americae borealis" 

 appears on page 155 of the text) . 



Spirobolus marginatus (not Say) Wood, 1865, Trans. Amer. Philos. Soc, 

 new ser., vol. 13, p. 207 (this citation follows Bollman, whose identifi- 

 cation of Say's marginatus with the Floridian species does not seem 

 to be beyond challenge and which is here only provisionally ac- 

 cepted) . 



Spirobolus agilis Cope, 1869, Proc. Amer. Philos. Soc, vol. 11, p. 181 

 (type locality: Montgomery County, Virginia; types probably not 

 extant) . 



Spirobolus americae-borealis Bollman, 1893, U. S. Nat. Mus. Bull. 46, p. 

 145. 



Spirobolus americanus Hoffman, 1951, Florida Ent., vol. 34, p. 15. 



Type: Location unknown. 



Type Locality: North America, without further indication. 



