MILLIPEDS OF NORTH AMERICA 17 



As it does not seem possible to maintain as separate families, on the basis 

 of characters thus far proposed, the two groups designated by Cook as 

 the Chelodesmidae and Xystodesmidae, we here unite them pending a thor- 

 ough study of all the "leptodesmoid" families. The proposal of a family 

 Sigmocheiridae we regard as premature, particidarly as its primary diag- 

 nostic character is also found in numerous typical eurydesmoids of the 

 Neotropical region. 



Genus AMPLOCHEIR C3iamberlin 



Amplocheir Chamberlin, 1949, Journ. Washington Acad. Sci., vol. 39, No. 



3, p. 97. 

 Generotype : Xystocheir sequoia Chamberlin. 

 Range: California. 

 Species: Two. 



Amplocheir reducta Causey 



Amplocheir reducta Causey, 1955, Proc. Biol. Soc. Washington, vol. 68, 



p. 92, fig. 4. 

 Type : Amer. Mus. Nat. Hist. 



Type Locality: Briceburg, Mariposa County, California. 

 R\NGE: Known only from type locality. 



Amplocheir sequoia (Chamberlin) 



Xystocheir sequoia Chamberlin, 1941, Bull. Univ. Utah, biol. ser., vol. 6, 



No. 5, p. 15, fig. 28. 

 Amplocheir sequoia Chamberlin, 1949, Journ. Washington Acad. Sci., 



vol. 39, No. 3, p. 97. 

 Type: Collection of R. V. Chamberlin. 



Type Locality : Sequoia National Park, Tulare County, California. 

 Range: Known only from type locality. 



Genus APHELORIA Oiamberlin 



Apheloria Chamberlin, 1921, Canadian Ent., vol. 53, p. 232. 



Leptocircus (not Swainson 1833) Attems, 1931, Zoologica, Stuttgart, vol. 

 30, Lief. 3-4, p. 67 (generotype, L. inexpectatus Attems) . 



Generotype : Fontaria montana BoUman, by original designation. 



Range: Eastern North America, from Vermont and southern Ontario 

 south to North Carolina, Tennessee, and Arkansas, northwest to eastern 

 Iowa. 



Species: Twenty-two named forms, of which three are regarded as sub- 

 species of trimaculata. 



Apheloria adela Chamberlin 



Apheloria adela Chamberlin, 1939, Bull. Univ. Utah, biol. ser., vol. 5, 

 No. 3, p. 10, fig. 34. 



