296 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1919. 
It will be seen from this that there are two wet and two dry 
seasons, though these are not very sharply defined. |The long dry 
Seraag oP ee \ 
Fic. 2.—The colony of British Guiana. 
season from August to November is usually to be depended upon, but 
the other seasons vary.. On the lower Essequibo the rainfall may 
