Page 386: Changed Pariso to Paraiso. (Orig.: Aserradero del Pariso.--22°59´, 99°15´.) Page 390: Changed: intermadius to intermedius. (Orig.: Reithrodontomys fulvescens intermadius J. A. Allen 439) Page 398: Changed Tamulipas to Tamaulipas. (Orig.: subspecies from the Sierra de Tamulipas, previously) Page 399: Retained Mormops, but possibly a typo for Mormoops. (Orig.: 1864. Mormops megalophylla Peters, Monatsb. preuss. Akad. Wiss., Berlin, p. 381, type from southern México.) Page 402: Changed embyos to embryos. (Orig.: average crown-rump length of the 10 embyos was 43) Page 409: Changed veraecrusis to veraecrucis. (Orig.: P. s. veraecrusis) Page 410: Changed veraecrusis to veraecrucis. (Orig.: specimens of veraecrusis from Las Vigas, Veracruz.) Page 411: Retained measurement (17-8) grams; possibly typo for (17-18) or (17-17.8). (Orig.: three males 17.5 (17-8) grams.) Page 426: Changed Washinton to Washington. (Orig.: personatus tropicalis Goldman, Proc. Biol. Soc. Washinton,) Page 435: Changed perargrus to peragrus. (Orig.: 1918. Oryzomys couesi perargrus, Goldman,) Page 439: Changed descripton to description. (Orig.: According to the original descripton by Davis) Page 454: Changed Gaudalupe to Guadalupe. (Orig.: type from Sierra Gaudalupe, southeastern Coahuila.) Page 454: Changed N. l. microdon to C. l. microdon. (Orig.: N. l. microdon occurs from Camargo south to Nicolás.) Page 456: Changed Gaudalupe to Guadalupe. (Orig.: type from Sierra Gaudalupe, Coahuila.) Page 457: Changed to to two. (Orig.: 1962:338, recorded only to species) Page 459: Changed synonmy to synonymy. (Orig.: cited by Coues in synonmy as "Putorius mexicanus) Page 460: Changed three occurences of Shantz to Schantz. (Orig.: by Shantz. One of them T. t. littoralis (Shantz, 1949:301)) and (measurements are greater than those given by Shantz (1949:302)) Page 461: Changed weing to wenig. (Orig.: Darstellung neuer oder weing bekannter)