ment. Such damage has been caused by Leucote r rmes tenuis Hagen, 
Coptotermes niger Snyder, and X asutitermes ephratae Holmgren. 
There is also a discussion of the possibility of termites acting as 
mechanical carriers of the nematode Aphelenchus cocophiJus Cobb, 
which causes " red-ring " disease of coconut palms. Although species 
of Nasutitermes. Eutermes. and Coptotermes infest the trunks of 
coconut palms or have runways on them, only Coptotermes niger 
Snyder has been found with these nemas on the bodies of the workers. 
As in the Dietz-Snyder paper (£), all specimens were given num- 
bers in the field. All field observations and photographs of nests, 
galleries, damage, etc., are supported by numbered specimens of the 
termites. This insures accuracy and avoids confusion; it affords a 
check in case of wrong determinations, for the notes can then be 
identified easily and properly placed. 
GEOGRAPHICAL DISTRIBUTION. 
Apparently more species of termites inhabit the Pacific slope than 
the Atlantic slope of the Canal Zone. On the Atlantic slope the 
rainfall is greater. Mr. Zetek states that at Colon, in 1913. there 
were 246 rainy days, whereas at Ancon there were only 180. and 
the total precipitation was 131.22 inches and 65.98 inches, respec- 
tively; he has prepared a table (Table 2) giving the rainfall for 
1921 for the 13 towns, with comments. This is particularly inter- 
esting, especially since many termites are so dependent upon mois- 
ture. 
Reference to a map of Panama (Pis. I and II) 3 will show the Rio 
Chagres flowing practically southwestward. and receiving tributaries 
from both the north and south sides. Along the Atlantic side are 
rivers that empty into the Caribbean Sea and along the Pacific 
coast are rivers that enter the Gulf of Panama. There are. then, 
two more or less parallel divides, the first skirting the Atlantic 
coast, the second skirting the Pacific coast. Most people seem to 
have the erroneous idea that there is but one divide. 
The Hydrographic Office, Bureau of Navigation. Department of 
the Navy, considers the central section as from Culebra (more or 
less near Pedro Miguel) to Monte Lirio. This is based on the orig- 
inal divisions made by the chairman of the Isthmian Canal Com- 
mission when the canal was being built. The central region is not 
considered by the present writers to extend beyond Darien. 
Zetek has thus divided the Canal Zone into three regions — the At- 
lantic (as far as Darien). the central (from Darien to Pedro Mi- 
guel), and the Pacific (from Pedro Miguel to Panama). The great 
Gatun Lake has, of course, greatly altered this arrangement, and 
it may be necessary to change these limits somewhat. The central 
zone is a sort of transition zone, now less evident than when the 
digging of the canal was begun. The flooding of Gatun Lake killed 
the trees, and the insects had to go elsewhere and adapt themselves 
to new surroundings, or else die out. They emigrated in great num- 
bers, no doubt, and a large proportion did well in their new abodes 
after some fighting with those already in possession. 
"The m;i]> shown in Plate II la adapted from Plate I in Mammals of P:\nama, by E. A. 
Goldman (Smithsonian Miscel. Col., vol. 69. no. •". iolmm. 
