Bull. Ent. Research. Vol. XI. Part 4. 



Plate XV. 



Fig. 1. Site of a male cluster of G. morsitans; the short grass was 

 very green and luscious, and the flies occurred both on it and 

 on the longer grass near. 



Fig. 2. Experimental net and its furniture, as used for G. hrevipalpis 



and G. pallidipes. 



