PREFACKE. 
The present paper, by Mr. Henry Pittier, of the Bureau of Plant 
Industry, United States Department of Agriculture, is in continua- 
tion of a series begun by him several yea‘rs ago in the Contributions, 
- dealing principally with Colombian anc. Central American plants 
which are of economic value. Besides descriptions of two new species 
of Brosimum and Spondias there are here included further notes upon 
the difficult genus Sapium and a discussion of the nomenclature of 
the sapote and sapodilla, two important topical American fruit trees 
whose taxonomic history is exceedingly involved. 
FREDERICK V. CovILLE, 
Curator of the United States National Herbarium. 
II 
