6 BULLETIN 19 9, UNITED STATES NATIONAL MUSEUM 



Potrero Viejo remained our headquarters for over a month. We 

 made numerous short trips during that time; especially noteworthy 

 were those to Palma Sola (on the Veracruz-Orizaba highway), to 

 Tezonapa, Veracruz, and Cosolapa, Oaxaca, and to Cuautlapan, 

 Orizaba, C6rdoba, Acultzingo, and other localities along the C6rdoba- 

 Tehuacan road. We left Potrero Viejo on January 16, 1939, and 

 after a brief stop in Mexico City made headquarters in Cuernavaca, 

 Morelos, for nearly two weeks, with side trips to Puente de Ixtla 

 (Morelos), Cacahuamilpa (Guerrero), and Zempoala (Morelos and 

 Mexico) . 



Leaving Cuernavaca February 2, we continued toward Acapulco, 

 reaching there February 5. We collected in the vicinity of Acapulco, 

 with side trips to Coyuca, until February 11. Our route, with fre- 

 quent stops, then led northward again to Mexico City, where we 

 arrived on March 1. After two days in search of axolotls and other 

 ambystomids in the vicinity of Mexico City (with side trips to Texcoco, 

 Zumpango, and Chimalhuacan) , we started (March 4) on the road to 

 Guadalajara. Our first deviation from this route was on March 9 

 and 10, to Patzcuaro. On March 11 we reached Uruapan on another 

 side trip and continued southward to Apatzingan, returning to 

 Uruapan on March 19. An attempt was made to find Crotalus foly- 

 stictus in the marshes of the eastern end of Lake Chapala, but without 

 success, since most of the marshes have been drained and are now under 

 cultivation. We reached Guadalajara on March 24 and returned to 

 Potrero Viejo on March 26. On March 30 we left Potrero Viejo 

 enroute to Laredo with another shipment of specimens, arriving at 

 Laredo on April 3, 1939. 



After nearly a month in the United States we left Laredo on April 29, 

 1939, and arrived in Potrero Viejo on May 2. From there we went 

 to Veracruz by train and secured passage for Alvaro Obreg6n, arriving 

 on May 13. A river boat was then taken, via Ciudad del Carmen, 

 to Tenosique, Tabasco, the head of navigation on the Rio Usumacinta. 

 Our final destination, Piedras Negras, Guatemala, was reached on May 

 21 after two days by mule. We collected in the immediate vicinity 

 of Piedras Negras until June 23, when we left for Tenosique. 



From Tenosique (June 30) we continued downstream to Emiliano 

 Zapata and there procured mules for a 2-day trip to San Juanito, a 

 ranch half a mile from the village of Palenque. There we remained, 

 with a side trip only to the ruins of Palenque several miles distant 

 in the hills, until August 6, when we left for Alvaro Obreg6n and, 

 immediately thereafter, Potrero Viejo, where we arrived on August 14. 

 There we were joined by the junior author and with him left on 

 August 18 for Mexico City, where we arrived, via the usual route 

 through Tehuac§,n and Puebla, on August 22, after numerous brief 



