302 Trans. Acad. Sci. of St. Louis 
sect’s tongue to pass nearer the upper wall and so in 
contact with the stigma. The stigma is a valvular flap, 
turned backward over the two anthers. When a but- 
terfly withdraws its tongue the stigma is turned forward 
and the tongue comes in contact with the anthers. 
The flower is nearly erect and its border almost hori- 
zontal. It remains open all day. It may also be visited 
by night-flying lepidoptera. J. 24-Ap. 5, 10 visitors ob- 
served, F. 18-23. 
SHort-roncurp Brzs (1)—Halict.: Evylaeus pectoralis 
@. Lepmwoprrera (9)—Hesperi.: Amblyscirtes, Lerodea, 
Megistias, Polites baracoa, Thanaos juvenalis ; Nymphal.: 
Phyciodes; Papilion.: Papilio philenor; Pier.: Eurema 
nicippe, Zerene. 
Urrrcunara Inriara, Ma., Y.—The scape is supported 
on the water by a whorl of leaves and bears sev- 
eral flowers. The corolla is 18 mm. long and 9 to 12 mm. 
wide. The upper lip is 11 mm. long and 9 mm. wide. 
In its basal concavity is situated the stigma and two 
stamens. The lower lip has a palate which rises 5 mm. 
above its base and shuts against the upper lip, conceal- 
ing stamens and pistil and closing the spur. The flower 
is yellow, some reddish streaks on the palate forming 
path-finders. Below, the lower lip is three-lobed and lies 
in contact with the spur. 
The spur is saceate, notched at the tip, has a large 
mouth and is 8 mm. long. The valve-like stigma lies upo? 
and conceals the anthers. Later it rises so as to expose 
them. Nectar is secreted by the spur. The flowers Te 
main open a few days. Cross-pollination results from 
insect visits and self-pollination can hardly occur. Only 
one or two flowers on the scape are open at a time. The 
flower is evidently adapted to bees which know how to 
