m. A settlement on the western slopes of Cerro San Andres;

pine, oak, and fir forest.

Balsas (Rio).--A large river having its headwaters in Tlaxcala, Puebla, and northwestern Oaxaca, flowing westward through an arid valley to the Pacific Ocean, and in its lower part forming the boundary between Michoacan and Guerrero.

Barolosa (Cerro de).--Lat. 18 deg. 52', long. 102 deg. 57', elev. 2900-3050 m. Presumably the highest mountain in the Sierra de Coalcoman and located about 13 hours by mule east-northeast of Coalcoman; open pine-oak-fir forest and alder thickets.

Barolosa (Rancho).--Lat. 18 deg. 50', long. 103 deg. 00', elev. 2320