No.397.] VZSITORS OF THE CAPRIFOL/ACE XA. 49 
the fourteen species of Lonicera in the Northern States, ten 
have red berries, one yellow, and three black, or bluish-black. 
The original color of Z. sempervirens was undoubtedly yellow, 
to which it occasionally reverts. This color change is very 
common and may occur in the course of the development of 
the individual flower. In certain South American species of 
Lantana the flowers are at first yellow, when they are visited 
by bees, and later change to red, and are then attractive to 
butterflies. Z. sullivantii is also visited by the humming 
bird. 
DIERVILLA MÆŒNCH. 
This genus is confined to North America and consists of 
two species; one is distributed throughout the north temperate 
zone, the other is found in the mountains of the Southern 
States, 
Diervilla diervilla (L.) MacM.; D. trifida Mench. 
Bush Honeysuckle. 
The northern species, D. diervilla, is a low shrub growing 
in rocky woodlands and thickets. The flowers are solitary or 
in few-flowered cymes. The corolla is funnel-formed, more or 
less two-lipped, with a tube 7 mm. long, light yellow, the upper 
lobe marked with an orange honey guide. The honey, which 
is abundant and may fill the tube for 3 mm. of its length, is 
secreted by a thick quadrangular gland at the base of the tube 
on the upper side. The lower portion of the filaments, style, 
and middle lower petal are bearded, the hairs serving to exclude 
small insects and the wet. The odor is very faint or absent. 
The older flowers turn reddish, a color change which also 
occurs in Rides aureum and in the genera Weigelia, Fuchsia, 
and Lantana. In Rides aureum, Müller states that the more 
intelligent insects immediately recognize those flowers which 
no longer contain nectar, and consequently visit more blos- 
soms in the same time.! Repeated observations failed to show 
that the color change in D. diervilla was of the same signifi- 
1 Fertilization of Flowers, p. 251. 
