Tapanatepec.—Lat. 16° 32'; long. 94° 12'; elev. 90 m. A town on the Pan-American Highway on the lower slopes of the Sierra Madre de Chiapas; dense scrub forest [58].
Tehuantepec.—Lat. 16° 20'; long. 95° 14'; elev. 35 m. A large town on the Plains of Tehuantepec; scrub forest [61]. Collections were made in the vicinity of the town and in the dense scrub forest 8.6 kilometers west at an elevation of 85 meters and 14 kilometers west at an elevation of 120 meters.
Tenango.—Lat. 16° 16'; long. 95° 30'; elev. 1100 m. A town in the mountains about 40 kilometers west-southwest of Tehuantepec; scrub forest [67].
Tequisistlán.—Lat. 16° 24'; long. 95° 37'; elev. 190 m. A village in the valley of the Río Tequisistlán, a tributary to the Río Tehuantepec; dense scrub forest [54]. Most collections were made about one kilometer north of the village where the Pan-American Highway crosses the Río Tequisistlán.
Tolosita.—Lat. 17° 12'; long. 95° 03'; elev. 80 m. A village on the Río Tortuguero near the Trans-isthmian Highway; rainforest [30].
Tres Cruces.—Lat. 16° 26'; long. 95° 51'; elev. 750 m. A ranch near the Pan-American Highway, 70 kilometers by road west-northwest of Tehuantepec; dense scrub forest [49].
Tuxtepec—Lat. 18° 06'; long. 96° 05'; elev. 80 m. A town on the Río Papaloapan in northern Oaxaca; low evergreen forest [12].
Ubero.—Lat. 17° 18'; long. 95° 00'; elev. 80 m. A lumber camp and railroad station, 8.5 kilometers south of the Río Jaltepec on the Trans-isthmian Highway; rainforest [28].
Unión Hidalgo.—Lat. 16° 27'; long. 94° 48'; elev. 7 m. A village on the railroad, 20 kilometers east-northeast of Juchitán; open scrub forest [48].
Ventosa, La.—Lat. 16° 30'; long. 94° 51'; elev. 25 m. A village at the junction of the Pan-American and Trans-isthmian highways; open scrub forest [46].