290 | Trans. Acad. Sci. of St. Lows 
stamens are also horizontal, their dehiscent anthers fac- 
ing upwards. In this position there is no chance of the 
pollen touching the stigma. The large stigma is sessile. 
If a large bee loaded with pollen lands upon the flower 
it must dust the stigma before touching the anthers. 
Cross-pollination in this case is between different plants. 
If the insect does not bear pollen, it may readily effect 
self-pollination. The flower is visited exclusively for 
pollen, the petals, as in most pollen-flowers, soon falling. 
Females of small Halictidae, Chloralictus, Evylaeus and 
Oxystoglossa, were observed collecting pollen. 
COMPOSITAE. 
Brruanpirera Susacauuis, Mas, Y.—The heads are 
Single on the scapes and measure about one inch across. 
There are 8 to 10 broad, yellow ray-flowers which 
are pistillate. The lobes of the style are long, nearly 
erect, with stigmatic edges. The disc florets have 
nectar-bearing tubes 4 mm. deep. They are staminate, 
the pollen being carried out on a long style brush, as in 
Silphium. Ja. 10-Ap, 29, 14 visitors observed F. 27-Ap. 4: 
Lone-tonevep Bzzs (2)—Megachil.: Coelioxys sayi °5 
Megachile lanuginosa ¢. SHort-roncuep Buss (5, ?)— 
Halict.: Augochlora sumptuosa, Chloralictus floridanus 
sc, Evylaeus nelumbonis, E. pectoralis, Odontalictus s¢. 
(2)—Bombyli.: Anthrax lucifer; Tachin.: Chae- 
toglossa picticornis. Leproprera (5)— Hesperi.: Polites 
baracoa, Thorybes; Nymphal.: Phyciodes; Pier.: Eurema 
nicippe; Rhiodin. : Calephelis. 
On ten days, Mr. 7-21, the following 300 individuals 
were taken on flowers: 
Lone-roneusp Bzzs (8)—Ap. 1, Epeol. 3; Megachil. 4. 
SHort-ronevep Brrs (216)—Halict, 216. Drermra (9)— 
