Acayucan.--Lat. 17 deg. 57'; long. 94 deg. 55'; elev. 160 m. A large town on the Trans-isthmian Highway; rainforest [21]. Collections were made in the vicinity of the town, but principally at Rancho Las Hojitas, 7 kilometers northwest of town at an elevation of 150 meters. Alvarado.--Lat. 18 deg. 47'; long. 95 deg. 47'; sea level. A fishing village at the mouth of the Rio Papaloapan; coastal dunes and marshes [1]. Most collections were made 1-3 kilometers southeast of the village in marshes on the leeward side of the coastal dunes. Amatitlan.--Lat. 18 deg. 26'; long. 95 deg. 45'; elev. 4 m. A village on the bank of the Rio Papaloapan; savanna and sugar plantations [6]. Aquilera.--Lat. 17 deg. 48'; long. 95 deg. 01'; elev. 150 m. A village 21 kilometers southwest of Acayucan on the Trans-isthmian Highway; rainforest [22]. Ayentes.--Lat. 18 deg. 10'; long. 94 deg. 26'; elev. 2 m. A railroad station on the east bank of the Rio Coatzacoalcos, across the river from the city of Coatzacoalcos; scrub forest and marshes [17]. Berta.--Lat. 18 deg. 07'; long. 94 deg. 27'; elev. 5 m. A ranch just south of Coatzacoalcos; scrub and low evergreen forest [15]. Chacaltianguis.--Lat. 18 deg. 18'; long. 95 deg. 52'; elev. 5 m. A village on the Rio Papaloapan; savanna [8]. Ciudad Aleman.--Lat. 18 deg. 13'; long. 96 deg. 07'; elev. 30 m. A new government town, headquarters of the Comision del Papaloapan; scrub and low evergreen forest [10]. Coatzacoalcos (formerly Puerto Mexico).--Lat. 18 deg. 10'; long. 94 deg. 27'; elev. 2 m. A seaport at the mouth of the Rio 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 deg. 22'; long. 95 deg. 50'; elev. 4 m. An agricultural town on the Rio Papaloapan; savanna and sugar plantations [7]. Cosoleacaque.--Lat. 17 deg. 59'; long. 94 deg. 38'; elev. 55 m. A village 8 kilometers by road west of Minatitlan; savanna [19]. Cuatotolapam.--Lat. 18 deg. 08'; long. 95 deg. 16'; elev. 13 m. A village on the Trans-isthmian Railroad; savanna and low evergreen forest along streams [13]. Hueyapan.--Lat. 18 deg. 08'; long. 19 deg. 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.