Siphlo fuscus 21. Puebla, Puebla, Mex. to Orizaba, Orizaba, Mex. July 14, 1946 Trees, mesquite scrub, and candelabra cactus. 5 1/2 mi. SSE of Matamoros the temperature in the truck cab was 90°F. At this point the road rises over a small range. The hills are covered with a lush growth of xerophytes—saguaro cactus, tree-yucca, mesquite, and copal trees. The summit of the range is 4750 ft. at a point 7 mi. SSE of Matamoros. 6 miles farther on the altitude was 3700 ft. A nuthatch was noticed perched on a telephone wire at this point. 19 mi SSE of Matamoros the country becomes quite hilly. The road traverses another small range, with the crest at 3750 feet. 1 white-winged dove was seen at this point. 2 1/2 mi. past the crest, the elevation was 3250 feet. 35 1/2 mi SSE of Matamoros the temperature in the truck cab had risen to 95°F. 6 mi. SE of Huajupan, elevation 5800 ft., the lush desert vegetation thins out. There is scattered candelabra cactus, yucca (whipplei type) not blooming. The soil is thin, with many rocky outcrops, and there is a sparse grass cover. 9 1/2 mi SE of Huajupan elevation is 6300 ft. 13 1/2 mi SE of Huajupan elevation is 6200 ft., and 17 mi SE