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Probably the most important of these is known in Oaxaca as 
“Mulatilla.” It is a small species of Euphorbiodendron, the 
largest tree that I saw being only about four inches in trunk- 
diameter. It is said, in rare instances, to reach a diameter of a 
Fic. 5. Palm, the Leaves used for Thatching in Guerrero, Mexico. 
foot. The species is not described, and I purpose to describe it 
as E. Mulatilla. Its milk has apparently the same composition 
as that of E. fulvum, the ‘Palo Amarillo.” 
The milk of Plumiera rubra is said to be richer in rubber, though 
its quality is inferior. This tree is known in Mexico as Cacalo- 
xuchil. It is widely distributed and sometimes has a trunk 
diameter of nearly a foot. The species is widely distributed 
