Mies ra 10.] Notes on the Pollination of Flowers. 513 
large body rs the corolla tube exactly, and it can reach the honey 
with just that amount of difficulty which is necessary for the 
ck, 
This is the structure of the flower. The flower is altoge ether 
6—7 cm. across and about the same in-height ; the honey lies about 
4 cm. —. the mouth. The antrum into which the bee enters is 
2:0.~-2'5 cm. across and 15—2°0 cm. high from the ridge which 
runs along the middle of the floor to the roof. The e stigma and the 
our stamens lie under the roof of the antrum so as to touch the 
back of the visiting Xylocopa. The stigma projects just beyond. 
the anthers. The anthers are provided at their bases with 
a shower of ‘polle n down onto its back from out of the long 
brushes of hairs hich hold it. These horns have their tips one 
whole centimetre behind the edge of ‘the lower lip of the stigma; 
the insect, therefore, touches the stigma at an appreciable interval 
before, on touching these horns, it shakes down the shower of pollen 
onto its back. \ The insect does not touch the anthers themselves as 
these lie in a groove. e filaments broaden to their bases, and 
and is 8—9 mm. long. “The ecb in-the middle of it, and 
stamens to carry the stigma, as stated, to a position above the 
visiting bee’s back. The nectary surrounds the ovary but is most 
rite er below. 
n I first examined the flower it seemed to me just aro 
that the ley could be reached by a proboscis passed between 
and. below the lower stamens, but I soon saw that that was foe 
sible, and after a little watching I was able, by means of small 
windows cut in the sides of flowers, to observe how the tongue of 
X,. latipes reaches the honey. The bee settles on the floor of the 
Fic, 3.— Flower in vertical section; the 
dotted line indicates the way 
and pushes its way along it, touching first the stigma and 
antrum 
then catching against the hooks of the anthers, and with its legs 
