300 Trans. Acad. Sct. of St. Lowis 
clasped by the calyx, so that it resists the entrance of 
small insects and limits the visitors to those having a 
tongue 5 or 6 mm. long. On the base of the banner is a 
large pale spot crossed by purple lines which run in- 
wards, forming pathfinders. The keel petals are united. 
A process in each wing fits in a depression in the keel, 
so that keel and wings are depressed together. 
Both wings turn to the right, which requires the bee to 
land on the right. The bees taken on the flowers had 
pollen on the left cheek, so that the flower is pleurotribe. 
When the keel is forced down, the stigma and after it the 
dehiscent anthers strike the bee, the stigma thus receiv- 
ing pollen from other flowers. Self-pollination can 
hardly occur if the flowers remains undisturbed. F. 16- 
‘Ap. 23, 5 species and 19 individuals observed, F'.17-29. 
Lone-toncugp Brzs (2:13, ¢ )—Megachil.: Diceratos- 
mia 4, Megachile lanuginosa 9. Lxepmorrera (3:6, n.)— 
Hesperi.: Amblyscirtes 3, Polites baracoa 1, Thorybes 2. 
Viora AcutiForta, Ma., W.—The flower is 9 mm. 
long, the abcordate banner 6 mm. wide. The banner is 
pale bluish, marked in the middle with purplish streaks, 
which, with the purple tip of the keel, form pathfinders. 
Elsewhere the flower is white. 
The banner has a broad base, enclosing the other 
petals. It runs forward for 6 mm., thus limiting access 
to the nectar. The wings lie ulonseido the keel, hiding it 
from view, their tips far surpassing it. They are united 
with the keel and move with it. The keel is short 
(6 mm.), its petals united. Access to the nectar is on 
each side of the free filament. When the keel is de- 
pressed the anthers are exposed, but most of the pollen 
is deposited on the style-brush. The style turns up and 
