1892. ] Flowers and Insects. 71 
erythronii Rob. 49, s. andc. p., ab.; (12) A. mariae Rob. g, s.; 
(13) Halictus lerouxii Lep. 9, s.; (14) H. fasciatus Nyl. 9, s.; 
(15) H. confusus Sm. 9, s.; (16) Colletes inaequalis Say 4, s. ab. 
Lepidoptera— Rhopalocera: (17) Pieris rapae L., s.; (18) 
Colias philodice Godt., s.; (19) Nisoniades juvenalis F., s. 
Diptera — Bombylidae: (20) Bombylius fratellus Wadi 5.4 
one; Syrphidae: (21) Brachypalpus frontosus Lw., f. p., one; 
Muscidae: (22) Lucilia cornicina F., s., not touching stigma. 
TRADESCANTIA VIRGINICA L. (smooth form).— The plant 
is smooth ‘and glaucous with linear leaves, the stems rising 3 
to 6dm. and bearing from one to three umbel-like clus- 
ters of flowers, each umbel in turn with from 1 to 5 open flow- 
ers. The flowers are blue, expanding 3 or 4 cm., but 
retaining a shallow, bell-shaped form. The stigma is widely 
# 
tween flowers of distinct plants is much more probable. 
: € flowers are specially adapted to female bees, and other 
Insects in search of pollen. The hairs on the stamens are 
foot-holds for the use of bees in collecting pollen. ie 
he plant is in strong competition with Rosa humilis for 
the attention of pollen-visitors, Tradescantia faving the ad- 
vantage of abundance and Rosa of conspicuousness. But 
%; (2) Bombus separatus Cr. 2; (3) Synhalonia speciosa Cr. 2; 
(4) Ceratina dupla Say 9; Andrenidae: (5) Agapostemon 
