34 U.S. NATIONAL MUSEUM BULLETIN 266 



Platyrhacus chapini Hoffman 1953c, p. 254. 



TYPE: U.S. Nat. Mus., no. 2079. 



TYPE LOCALITY: Los Siguas, Chiriqu' Prov., Panama. 

 Platyrhacus gracilipes Loomis 1964a, p. 60. 



TYPE: Chicago Nat. Hist. Mus. 



TYPE LOCALITY: Cerro Punta, ChiriquT Prov., Panama. 



PARATYPE LOCALITIES: Same, and Finca Lerida, near Boquete, 

 Chiriqui Prov., Panama. 

 Platyrhacus mexicanus (Lucas). 



Polydesmus mexicanus Lucas 1840, p. 523. 



Polydesmus (Stenonia) mexicanus Saussure 1860, p. 534; AttemslQOO, 

 p. 348. 



TYPE: Present location unknown (H). 



TYPE LOCALITY: Mexico. 



Hoffman 1953c and Jeekel 1963a consider this species unidentifiable. 

 Hoffman now thinks it may be South American. 

 Platyrhacus pococki Brolemann 1911a, p. 14. 



Nyssodesmus pococA;i Chamber 1 in 1922, p. 40; Hoffman 1953c, p. 257, 



Platyrhacus stenopterus Pocock 1909, p. 145, not Brolemann; Jeekel 

 1963a, p. 89. 



TYPE: British Mus. 



TYPE AND PARATYPE LOCALITY: Rancho Redondo, Costa Rica. 



OTHER LOCALITIES: Cuesta del Tablazo Costa Rica (Chamberlin 

 1922); Volca'n Irazu, Costa Rica (Attems 1933). 

 Platyrhacus propinquus Carl 1902, p. 665. 



Nyssodesmus propinquus Chamberlin 1922, p. 40; Hoffman 1953c, 

 p. 257. 



TYPE: Mus. Hist. Nat. Geneve. 



TYPE LOCALITY: Las Delicias, Santa Clara Prov., Costa Rica. 

 Platyrhacus riparius Carl 1902, p. 641. 



Nyssodesmus riparius Chamberlin 1922, p. 40; Hoffman 1953c, p. 257. 



TYPE: Mus. Hist. Nat. Geneve. 



TYPE AND PARATYPE LOCALITY: Rio Genera'l, Pacific slope, 

 Costa Rica. 



Genus PSAMMODESMUS Cook 1896, p. 52. 



Ernostyx Chamberlin 1941e, p. 497; Hoffman 1953b, p. 301. 



TYPE SPECIES: Psammodesmus cos Cook, by original designation. 

 Psammodesmus remotus Loomis 1964a, p. 62. 



TYPE: Chicago Nat. Hist. Mus. 



TYPE LOCALITY: El Valle, Code' Prov., Panama. 

 Psammodesmus schmitti Loomis and Hoffman. In Hoffman 1953b, p. 301. 



TYPE: U.S. Nat. Mus,, no. 2016. 



TYPE LOCALITY: Puerto Obaldia, Darien Prov., Panama. 



