376 The Philippine Journal of Science 
fall, leaving a small perforation at the apex of each individual 
fruit through which it is apparent that the small, slender, winged 
seeds escape, dissemination of seeds apparently covering a con- 
siderable period of time. 
The generic name is derived from the Greek pippyxos, 
ant, and Nauclea, a genus to which the present one is closely 
allied, as a certain percentage of the branchlets always present 
hollow swellings, perforated on one side, which are inhabited 
by colonies of small ants. 
In habitat the species is exceedingly characteristic, as it al- 
ways grows on the banks, and on gravel bars in the beds, of 
small shaded mountain streams, always in places subject to 
overflow in times of heavy rain; frequently the shrubs stand 
in constantly running water as does the euphorbiaceous Homo- 
noia riparia Lour. It occurs in Palawan at altitudes from sea 
level to about 300 meters. 
I have examined the following material representing the spe- 
cies: BORNEO, Sarawak, Mount Merinjak, Native collector 2588, 
2620 (Bur. Sci.). PALAWAN, Alfonso XIII, For. Bur. 21587 
Danao, April 9, 1914; Caruray, For, Bur. 27289 Flores; Taytay, 
Merrill Phil. Pl. 1201; Napsahan, Merrill 7234; region of Puerto 
Princesa, Merrill 724, Elmer 12848. The Philippine specimen 
cited by Haviland as Vidal 1445 ig Vidal 1448. It is labeled as 
from Luzon but in all probability came from Palawan. 
