BEHAVIOR OF A PARASITIC BEE 387 



SERIES V (MAY 9, 1911) 



Experiment 23. — At 11. 15 a. m., the cage was placed in a 

 sunny window in such a position that the side next to the windoiv 

 and the top were strongly illuminated by the direct sunlight. The 

 bottom and each of the other sides were partly in the sunlight and 

 partly in the shadow. 



At this time the cage contained three females; all of the 

 males and the remainder of the females had died. The bees 

 flew about the cage in all directions ; alighting sometimes on 

 the sunny netting of the window-side of the cage and some- 

 times in the sunlight on the floor. Often they would remain 

 on the floor several seconds. A bee alighted several times in the 

 shadow above the lighted patch on the window-side of the cage. 



At 11.28 A. M., two bees were resting, in the sunlight, on the 

 netting of the window-side of the cage. The other bee crawled 

 obliquely upwards to the wood above the netting of the window- 

 side of the cage and then, after flying about in many directions, 

 alighted in the shadow, on the left side of the cage. 



At 11.40 A. M., a bee fed on honey and then, after a short 

 flight of orientation, alighted on a mud cell and remained thereon, 

 cleaning its mouth-parts and its head with its fore legs. A 

 few moments later, another bee fed upon honey and flew into 

 a mud cell, without making a flight of orientation. 



At 11,46 A. M., two bees were in the mud cells and one was 

 on the sunny netting of the window-side of the cage. The bee 

 on the netting repeatedly climbed upwards, through the sun- 

 light, to the lower edge of the shadow and then dropped back- 

 wards an inch or two. 



At 11.48 A. M., two bees were on the window-netting and a 

 third was sipping from a watch-glass situated in the shade. 

 On leaving the honey and after making a short flight of orien- 

 tation, the bee flew towards the left and alighted, in the sun- 

 shine, on that wall of the cage. After resting a few moments, 

 it flew again to the honey. From the honey it returned to the 

 sunny netting on the left side of the cage. After resting a 

 moment, it flew again to the honey and from there to the sunny 

 patch on the window-side of the cage. (This side of the cage 

 formed an angle of ninety degrees with the left wall.) From 

 this side of the cage the bee flew into a mud cell situated in 

 the shade. 



