R.K. Selander, 1954 7 Japamato, Guanajuato to Mexico, P.F. March 14 San Juan del Rio ; then south to Toluca and east to Mexico City. Road is in fair condition most of the distance but is lumpy in some spots. March 15 Stayed in Hotel Waldorf (45 pesos) during the night of March 14. Prepared cactus worms in hotel room. Up early and went over to the Institute Biologia to see Martin del Campo but he was not there so I left a message. Had truck greased, Left Mexico City around noon and drove to Puebla. Cerro Matalcuetitl didn't look good for megaloapterus habitat. The top several hundred or a thousand feet are bare rock and the lower slopes are farmed. Probably only a belt of pine forest between the farmed slopes and the rocky top portion. Without further evidence of a fir forest there I would not include that mountain within the range of C. megaloapterus. We drove south through agricultural lands of the Puebla Valley. At Dzuca de Matamoras (4349 on Texaco Map) begins a rich arid tropical forest of cactus and de- ciduous bushes and short trees. This forest is similar to that of the Rio Balsas of Guerrero. It continues to a point about 20 or 30 miles south east of Acatlan (3980ft on Aviline Map) where the road climbs into the, mountains north west of the Oaxaca Valley. Most of the trees are deciduous and at this season have no leaves. A terna cactus is abundant. Also common are a cardon cactus, large agave which