NOMS © SMITHSONIAN EXPLORATIONS, IQ12 69 
and investigated the caves more thoroughly than had been possible 
previously. It was found that there is an upper series of dry caves 
and a lower series containing water. In the rainy season these iatter 
become inaccessible subterranean rivers, and it was in them that the 
interesting bat-fauna was found, which Mr. G. S. Miller, Jr. has 
described in the Proceedings of the U.S. National Museum. 
The last part of March was spent on the upper Trinidad River 
where exceedingly rich entomological results were obtained, partly 
through the night work with the acetylene lamps. Early in April 
Mr. Busck went to Porto Bello on the Atlantic side. From that 
Fic. 75.—Porto Bello Bay, showing excavation in the mountain, where the 
rock used for the Gatun Dam was secured. Photograph by Busck. 
place he made several trips with good results, but on one of these, 
up the coast to the Santa Rosa River, he unfortunately became ill 
and was forced to go to a hospital. Having recovered, he proceeded 
a week later to La Chorrera where the rainy season was at its height 
and the collecting proved excellent. He established himself there 
for two weeks, collecting beyond the savannah area in the foothills 
near the origin of the Trinidad River. The acetylene lamps and the 
white trap-sheets proved valuable adjuncts to the outfit, and much 
material was secured by collecting at night. 
The last part of May was occupied with minor excursions in or 
near the Canal Zone; among these a short trip up the Chagres River. 
On June 1, he undertook a second trip up the Trinidad River, and 
found conditions quite different from what they were before, owing 
