372 TROPICAL WILD LIFE IN ERITLSH GUIANA 



FEBRUARY' MARCH APRIL MAY JUNE JULY AUGUST^EFreMBeR 



FIG. 124. CHART OF RAINFALL IN INCHES. AS CORRELATED WITH THE NESTING OF 

 WASPS AND BEES IN BARTICA DISTRICT. 



The number of nesting species increased steadily witli 

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

 they i-eceded 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, 

 I cannot give 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, JNIarch 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 



