JULY, 1900. GRAENICHER— FERTILIZATION OF SYMPHORICARPOS, ETC. 155 
s. and cp. ; (8) Ceratina diipla, Say. ? , s. ; (9) Megachile rela- 
tiva, Cr. 9, s. and cp. ; Andrenidae: (10) HalicHts coriaccus, 
Sm. ■ ? , cp. ; (11) H. forhesii, Rob. 9, cp. ; (12) H. similis, Sm. 
?, s. and cp. ; (13) Aiigochlora vividula Sm. cp. ; (14) 
Agapostemon radiatits, Say. 9 , s. 
B* Flies. 
Syrphidae: (15) Me so gramma marginata, Say, fp. ; (16) 
Syrphus xanthostomiis, Will. fp. 
C. Butterflies and Hawk-Moths. 
Rhopalocera: (17) Atrytone zahulon, Boisd.-Lec, s. ; Hete- 
rocera: (18) Hemaris difUnis, Boisd., s. 
D. Birds. 
(19) Trochilus coluhris, L., s. 
As has been stated above, Lonicera Siillivantii is adapted to 
bumble-bees ; 2 species of the latter : Bombits americanorum and 
B. edzvardsii are the most frequent among the visitors, as I have 
often observed. The visits of the smaller bees are of slight sig- 
nificance. If they appear on the newly opened flowers, as long as 
the stamens and style are short and close together, they may, 
while collecting pollen at the same time touch the stigma and 
cause either self- or cross-fertilization. The hawk-moth : Hemaris 
diffinis and the hummingbird may be of benefit to the flowers, 
while the pollen-eating Syrphid-flies can render no services what- 
ever. 
Review: Our species of Lonicera, which have been consid- 
ered in the foregoing, are all adapted to bees. They differ from 
each other mainly in the length of their corolla tubes, L. oblongi- 
folia having the shortest tube, with a length of 4 mm. only, while 
the longest tube, that of L. Sullivantii attains a length of 14 mm. 
in our locality, and of even 18 mm. in Southern Illinois, as 
reported by Robertson. The length of the stamens and style is 
also of much importance, as those of our honeysuckles with long 
and widely divergent stamens and a long style can hardly be 
efficiently visited by the small-bodied bees, but have to rely to 
a certain extent on the cooperation of bumble-bees. 
