NO. 30 SMITHSONIAN EXPLORATIONS, I9QI12 7 
to the damming of the Gatun Lake. The old trails through the 
swamp and forest were flooded knee-deep, and the water rose halt 
a foot a day during his stay. This handicapped the collector's work 
considerably, as all the operations had to be carried on from a dugout 
canoe. The remaining hilltops, however, proved all the richer in 
insect life, as well as in other animal life. The augmentation of the 
Fic. 78.—Tied up for the night, on the upper Chagres 
River. Photograph by Hildebrand. 
mosquito fauna proved as interesting as it did annoying to the 
collector. 
About the middle of June, Mr. Busck returned from this locality, 
which in another few months would become totally submerged, 
departed for New York, and arrived in Washington June 24. 
Dr. C. D. Marsh, of the Bureau of Plant Industry, accompanied 
the survey party to the Canal Zone to make typical collections of the 
plankton organisms in the fresh waters of the Atlantic and Pacific 
slopes of the Isthmus. He arrived at Cristobal on January 15, 1912, 
