40 Trans. Acad. Sci. of St. Louis 



beds by bricks inclined in such a manner as to form a 

 serrated border of wedges of bricks, each wedge being 

 about two inches high and something over four inches 

 wide at the base.'" One of these flower beds, which was 

 quite sandy, contained in its center a patch of nastur- 

 tiums. * * * In a barren spot in this bed, adjacent to an 

 inverted tin cap of a Coca-Cola bottle, and within an inch 

 of the northern face of one of the bricks that formed the 

 serrated border, a burrowing-bee excavated a burrow. 

 The nest was discovered at nine a. m., August 8, 1908. 

 The sun was shining brightly at the time but the nest, 

 which was situated a little to the west of the southern 

 wall of a large three-story brick building, was in the. 

 shadow. A gentle breeze was blowing from the south. 

 At the time mentioned, the bee was busy collecting pollen 

 and storing it in its burrow. The flowers from which 

 it obtained its supply must have been quite remote, for 

 it required about thirty minutes to make the trip. 



**For convenience, the brick before which the burrow 

 was located was designated zero and bricks to the west 

 of it Wj, AV2, W3, etc., in regular succession. Likewise 

 the bricks to the east were named E,, E., E3, etc. 



"The field from which the bee obtained its pollen was 

 situated to the south of the school, and the burrow of the 

 bee was located to the north of the brick border. On 

 arriving from its forage, the bee would reach the brick 

 border at or near brick W,o. It then would turn about 

 so as to face the northern surface of the brick border. 

 Then hovering at about an inch and a half from the 

 ground and at about the same distance from the bricks, 

 the bee would sidle along. Usually its movement was 

 toward the east but occasionally it would retrograde 



13 Turner, C. H. The Homing of Burrowing Bees. Biol. Bulletin, 

 vol. 15, pp. 247-268. 



