40 U.S. NATIONAL MUSEUM BULLETIN 266 



TYPE LOCALITY: Eastern Cordillera, Mexico. 



OTHER LOCALITIES: Monte Azul, Cerro de Azcamela, Sierra de Agua 

 in the Eastern Cordillera, Mexico (Pocock 1909). 

 Rhachidomorpha aurantium Chamberlin 1952a, p. 564. 



TYPE: Chicago Nat. Hist. Mus. 



TYPE AND PARATYPE LOCALITY: El Fortm, Veracruz, Mexico. 

 Probably Fortin de las Flores. 

 Rhachidomorpha tarasca (Saussure). 



Polydesmus (Rhachidomorpha) tarasca Saussure 1860, p. 327; Attems 

 1899, p. 410. 



TYPE: Mus. Hist. Nat. Geneve (H). 



TYPE LOCALITY: Cordoba, Mexico. 

 Rhachidomorpha vicinus Chamberlin 1943b, p. 52. 



TYPE: Collection of R. V. Chamberlin. 



TYPE LOCALITY: Eighteen mi. west of Perote, Veracruz, Mexico. 



PARATYPE LOCALITY: Same, and 18 mi. north. 



Genus RHACHODESMUS Cook 1895, p. 4. 



Polydesmus (Rachis) Saussure 1859, p. 326 (original spelling). 



Rhachis Attems 1899, p. 326. 



Rhachis Carl 1903, p. 554, new subgenus (preoccupied). 



TYPE SPECIES: Polydesmus (Rachis) viridis Saussure, by monotypy, 

 see Cook 1896, p. 6. 

 Rhachodesmus viridis (Saussure). 



Polydesmus (Rachis) viridis Saussure 1859, p. 326. 



TYPE: Mus. Hist. Nat. Geneve (H). 



TYPE AND PARATYPE LOCALITY: Orizaba, Mexico. 



Genus SAKOPHALLUS Chamberlin 1942a, p. 59. 



TYPE SPECIES: Sakophallus simplex Chamberlin, by original desig- 

 nation. 

 Sakophallus simplex Chamberlin 1942a, p. 59. 



TYPE: Collection of R. V. Chamberlin. 



TYPE LOCALITY: Cerro TancTtaro, Michoacan Mexico. 



Genus STRONGYLODESMUS Saussure 1859, p. 327. 



Ceuthauxus Chamberlin 1942b, p. 12. New synonymy. 



Study of a topotype male of Chamberlin's C. morelus, and of a new 

 species closely related to his C. potosianus, confirm this synonymy. 



TYPE SPECIES: Strongylodesmus cyaneus 'bavLSsme yhy monotypy . 

 Strongylodesmus cruzanus (Chamberlin). New combination. 



Ceuthauxus cruzanus Chamberlin 1943b, p. 51. 



TYPE: Collection of R. V. Chamberlin. 



TYPE LOCALITY: Near Fortm, Veracruz, Mexico. Probably Forti'n 

 de las Flores. 



