32 
BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 5, NO. 1. 
The flowers with their faint odor are regularly visited by bees, 
but the larger and therefore more conspicuous male flowers are 
decidedly more attractive than the female flowers. On June 19 
two large plants standing close together, one with male and the 
other with female flowers, were kept under observation for some 
length of time. The male flowers received a grater number of 
visitors, mostly female bees of the genus Halictus in search of 
pollen, and the few bees paying their attention to the female flow- 
ers were mostly supplied with pollen from their previous visits to 
the male flowers. In this manner cross-pollination is insured in 
accordance with the rule laid down by Sprengel that in diclinous 
plants the male flowers are more showy so as to attract the insects 
in the order most favorable to pollination. Both kinds of flowers 
secrete nectar at the bottom of the tube. 
The following visitors were observed on three different days 
in June : 
Hymenoptera 
Apidse: (i) Bomhiis consimilis Cr. female, s. ; (2) Ceratina 
diipla Say female, s. and c. p.; (3) Megachile infragilis Cr. male, 
s. ; Andrenidse: (4) Augochlora confnsa Rob. female, s. and c.p. ; 
(5) Halictus coriaceus Sm. female, c. p. ; (6) H. 4-inaculaHis Rob. 
female, c. p.; (7) H. zephyriis Sm. female, c. p.; (8) Prosopis 
pygmcea Cr. female, s. 
Clintonia borealis (Ait) Eaf. Yellow Clintonia. 
On two different occasions, on June 3 and 5, I have had the 
opportunity of watching these flowers in a tamarack sw^amp at 
Elkhart Lake, Sheboygan Co., Wis. They were visited by two 
species of bumble-bees and two smaller bees as follows : 
Hymenoptera 
Apidse: (i) Bombiis consimilis Cr. female, s. and c. p.; (2) 
B. z'irginicus Oliv. female, s. and c. p. ; Andrenidse : (3) Halictus 
versatus Rob. female, c. p.; (4) Agapostemon radiatus Say 
female, s. 
Miss Alice Carter (14) witnessed the visits of bumble-bees at 
Ithaca, N. Y., and Lovell (15) in Maine those of a beetle, the 
14. Alice Carter. Notes on pollination. Bot. Gaz., Vol. XVII., 
p. 21 (1892). 
15. J. Lovell. Loe. cit., p. 499. 
