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THOI'K Al. WILD UTK IN jnilTISH GUIANA 



FIG. 12-1. CHART OF RAINFALL IN INCHES, AS CORRELATED WITH THE NESTING OF 

 WASPS AND BEES IN BARTICA DISTRICT. 



The niiinber of nesting s^^ecies increased steadily with 

 each month, reaching the highest point in June, after which 

 they receded gradually. In a measure they followed the 

 course of the rainy season, being most numerous in June and 

 July. As I was at Bartica only half the month of February, 

 1 cannot giye an accurate figure of the nesting species. How- 

 ever, a very diligent search during the last fifteen days of 

 that month revealed only five species, and while I am con- 

 vinced that it is a low estimate, March showed but a slight 

 increase and my figure may not be far out of the way. 



The accompanying chart gives a rough idea of the num- 

 ber of nesting wasps and bees as they varied in relation to 



