the homing of the burrowing- bees. 25 i 



Experiment 9. 



Tlie same conditions as in experiment eight. The apparatus had 

 been left in position for twenty hours. Something- had trampled 

 the tent to the ground. It was readjusted to the proper height. 



At 9:34 A. M., August 15, the bee arrived, hovered but a 

 moment, and then entered the tent, through the southern open- 

 ing, and drojjped immediately into the burrow. 



Experiment 10. 

 While the bee was afield, several stalks of grass were removed 

 from the west side of the tent; thus increasing the tvidtli of the 

 barroi patch that stirrounded the burrow. The other conditions 

 were the same as in experiment nine. 



At 9:54 A. M., the bee arrived from the field. It circled about 

 fully a minute before entering the tent. It then passed through 

 the northern opening and immediately dropped into the burrow. 

 On departing, at 9:59 A. M., the bee did not stop to explore the 



surroundings. 



Experiment ii. 



The same conditions as in experiment ten. 



On arriving, at 10:18 A. M., the bee circled about for a 

 moment and then, entering the tent through the southern open- 

 ing, immediately dropped into the burrow. At 10:23 A. M., the 

 bee departed, through the southern opening, without stopping to 

 explore the surroundings. 



Experiment 12. 



While the bee was afield, the tent, zvith the open ends facing 

 north and south, ivas placed two inches to the west of the )iest-open- 

 ing. A rectangtdar piece of black paper, 12 cm. long by 8 cm. 

 zvide, with a hole ij mm. in diameter in its center, zvas so adjusted 

 over the nest as to Jiave the hole in its center coincide ivith the open- 

 ing of the Imrrozu. The rectangular piece of white paper, ivith the 

 hole in its center, was left in the same position as in experiment 

 eleven. 



At 1 1:16 A. M., the bee arrived from the field, hovered a few 

 seconds above tlic black paper, then dropped into the nest. On 

 leaving, at 10:51 A. M., it hovered a short while before departing. 



