APRIL, 1906. SOME NOTES ON THE POLLINATION OF FLOWERS. 
21 
Of the 26 visitors enumerated in the foregoing list, 18 or 69% 
are flies. For Pamassia palustris we find the following 
records (7): H. Mueller and P. Knuth observed 75% flies in 
Germany among 28 visitors ; H. Mueller 73% in the Alps among 
59 visitors ; Alfken and Leege 63% on the Island of Juist among 
19 visitors ; Burkill 70% on the eastern coast of Scotland among 
23 visitors, and MacLeod 80% in the Pyrenees among 10 visitors. 
The average for P. palustris obtained from these figures amounts 
to 72%, and it is interesting to note that our P. Caroliniana with 
69% of flies agrees rather closely with the first named species. 
The difference in the development of the staminodia in the two 
considered species does not seem to be of any influence on the 
visitors if we are entitled to draw conclusions from the number 
of species or the percentage of flies, but after aH there might be a 
difference in the number of individuals attracted to the flowers. 
7. Cited by Knuth in Handbuch der BJuetenbiologie, IT, pp. 458-459. 
