NORMAL AND EXPERIMENTAL POLLINATION. 



Prosopis varifrons is very small in comparison with the size of the tube, and 

 some individuals go directly to the nectary and depart without touching the 

 anthers. Others work upside down and eat pollen as they hang suspended 

 from the anthers, without making any attempt to find the nectary. Halic- 

 tus pulzenus lands on the lower lip, then walks to the upper one and stands 

 upside down on the anthers. The tip of its abdomen is just below these 

 while it is removing pollen with its front legs. It also picks up and eats 

 any pollen that has dropped on the lower lip. 



Bombus juxtus lands in the normal way, turns upside down, and takes a 

 position such that the anthers rub the thorax as it moves back and forth. 

 It also scrapes pollen from the anthers with its front legs and transfers it to 

 the hind ones. This bee often tries very hard to open buds and turns over 

 and around in the attempt to do this. Bombus bifarius goes into a corolla- 

 tube, turns upside down, and scrapes pollen from the anthers with its front 

 legs, placing it on the hind ones. Monumetha albifrons lands and goes 

 directly to the nectar. Its thoracic hairs brush the anthers as it sucks 

 nectar and some pollen is collected accidentally, but it makes no effort to 

 gather it. Titusella pronitens works on the anthers only, standing upside 

 down as it collects pollen on its scopa. 



Table 48. — Visitors to normal flowers. 



Calendars. — Table 48 contains the results of observations on six dif- 

 ferent days. There were 150 open flowers under observation on the first 

 date, 172 on the second, and 100 on the others. The records were made 

 at the following times: (1) June 25, 8 to 10 a. m.; (2) June 27, l h 40 m to 3 h 18 m 

 p. m.; (3) June 28, 10 h 35 m to ll h 04 ra a. m.; (4) July 13, 10 to ll h 30 m a. m.; 

 (5) July 24, ll h 06 m to ll h 40 m a. m.; (6) July 1, 9 h 15 m to 10 h 40 m a. m. 



