June, 1911.] 
Pollination Notes. 
3 8 3 
and pistil is interesting as they were found in every case to be on 
the upper side of the fused corolla-tube so that an insect of similar 
proportions to a Bombus would be effectual in cross-pollination. 
Visitors: Diptera; Mesogramma geminata; Coleoptera; Strigo- 
derma arboricola; Hymenoptera; Polistes pallipes, 
Microbembex monodonta, Chorion caerulenm, 
Spharophtalma ferruginata, Agapostemon radia- 
tus. 
Family Labiatae (Mint Family). 
Monarda fistulosa. (Wild Bergamot). 
Visitors: Lepidoptera; Hemaris diffinis; Hymenoptera; Bom- 
bus separatus, Agapostemon splendens, Apathus 
citrans, Cetrania dupla. 
Nepeta cataria. (Catnip). 
Visitors: Diptera; Eristalis tenax, Mesograpta marginata; 
Lepidoptera; Pieris rapae, Chrysophanus liypo- 
phlaeas; Coleoptera; Trichius piger; Hymenop- 
tera; Ceratina dupla, Elis plumipes, Microbembex 
monodonta, Coelioxys 8-dentata, Megachile pru- 
ina, and Megachile sp. 
Pontederiaceae (Pickerelweed Family). 
Pontederia cordata. Here we have an example of a tri-mor- 
phous flower. Apparently no observations had been made on this 
plant, as Knuth made no record of such. On this account special 
care was taken in collecting and labeling the various visitors. 
During the collecting it was noted that a bee-flv (Eristalis flavipes) 
visited about sixty individual flowers, on several spikes, during 
a one-minute period. 
Visitors: Diptera; Helophilus chrysostomus, Eristalis flavipes; 
Lepidoptera; Hemaris thisba, Papilio polyxenes, 
Pieris rapae; Coleoptera; Megilia maculata, 
Strigoderma arboricola, Disonyclia pennsylvanica, 
Trirhabda tomentosa; Hymenoptera; Bombus 
virginicus, Agapostemon splendens, Agapostemon 
radiatus, Megachile (several species unidentified) 
In the above list of plants studied we have seen various types of 
pollination, in fact, hardly two of the families show any close 
similarity. Many more collections might have been made on 
the plants studied, as well as others of the same vicinity, but time 
would not permit. Insects laden with pollen and others who 
sought only nectar were observed but no special studies were 
made of these. It is the chief ami of this paper to emphasize the 
broadness of this field of work on Cedar Point and, possibly, to 
bring the subject to the attention of some one who can add or 
encourage succeeding chapters on this subject for the Naturalist. 
