Chacaltianguis.—Lat. 18° 18'; long. 95° 52'; elev. 5 m. A village on the Río Papaloapan; savanna [8].
Ciudad Alemán.—Lat. 18° 13'; long. 96° 07'; elev. 30 m. A new government town, headquarters of the Comisión del Papaloapan; scrub and low evergreen forest [10].
Coatzacoalcos (formerly Puerto México).—Lat. 18° 10'; long. 94° 27'; elev. 2 m. A seaport at the mouth of the Río Coatzacoalcos; scrub on coastal dunes; marshes and low evergreen forest inland [16]. Most collections are from the forest-savanna ecotone, 8 kilometers southwest of town.
Cosamaloapan.—Lat. 18° 22'; long. 95° 50'; elev. 4 m. An agricultural town on the Río Papaloapan; savanna and sugar plantations [7].
Cosoleacaque.—Lat. 17° 59'; long. 94° 38'; elev. 55 m. A village 8 kilometers by road west of Minatitlán; savanna [19].
Cuatotolapam.—Lat. 18° 08'; long. 95° 16'; elev. 13 m. A village on the Trans-isthmian Railroad; savanna and low evergreen forest along streams [13].
Hueyapan.—Lat. 18° 08'; long. 19° 09'; elev. 85 m. A town 32 kilometers by road northwest of Acayucan; savanna and low evergreen forest [14]. Collections were made in the vicinity of the town and from forest 10 kilometers southeast of town at an elevation of 135 meters.
Jesús Carranza (formerly Santa Lucrecia).—Lat. 17° 27'; long. 95° 02'; elev. 80 m. A town and railroad junction in the middle of the isthmus; rainforest [26]. Most of Dalquest's specimens came from varying distances from Jesús Carranza along the Río Coatzacoalcos and its tributaries.
Minatitlán.—Lat. 17° 58'; long. 94° 32'; elev. 15 m. An oil refinery center on the Río Coatzacoalcos; savanna [20].
Naranjo.—Lat. 17° 35'; long. 95° 07'; elev. 100 m. A village on the Trans-isthmian Highway, 45 kilometers south of Acayucan; rainforest and palm forest [24].