502 
The Ohio Naturalist. 
[Vol. XII, No. 6, 
Visitors — Diptera; Sphaerophora cylindriea: Hymenoptera; 
Microbembex monodonta, Agapostemon radiatus, Odynerus fora- 
minata, Bombus fervidus, B. affinis, Andrena carlini, Megachile 
latimanus. 
Teucrium canadense. 
This species, which varies in color from cream to purple, is 
common along the shores of the coves in this region. It was 
observed that the species was closely associated in habitat with 
Asclepias incarnata (swamp milk-weed), a flower of about the 
same hue, and insects were seen to be attracted first to the Ascle- 
pias, then later to visit the Teucrium. 
The corolla is very irregular, the four upper lobes are approxi- 
mately equal in size, but so placed and directed forwards that there 
appears to be no upper lip, the lower lip is larger and forms a con- 
venient landing-place for insects. The four stamens are unequal 
in length, the outer pair exceeding the inner by about 3mm. The 
style, which lies between the inner pair is approximately the 
length of the outer pair, but curves less, so that without external 
causes self-pollination would not occur. 
The larger bees alight on the lower corolla lobes and insert the 
proboscis at either side into the corolla tube. As the bee’s head 
is pushed down into the corolla the anthers are brought into 
contact with the dorsal part of the visitor’s thorax, which in many 
bees is distinctly pilose, and thus pollen is dusted off. Since this 
could hold true for larger insects, the writer does not believe that 
smaller Hymenoptera or Diptera are important factors in cross- 
pollination. Several smaller species of Hymenoptera and Syr- 
phidae were observed to alight directly on the anthers, grasping 
the filaments for support, and possibly in this way could affect 
cross-pollination. 
Visitors — Diptera; Syritta pipiens, Allograpta obliqua, Syr- 
phus americana, Eristalis tenax: Hymenoptera; Agapostemon 
radiatus, A. splendens, Ceratina dupla, Odynerus foraminata, 
Melissodes sp., Bombus virginicus, B. amerieanorum, B. affinis, 
Psittyrus clatus, Xylocarpa virginica, Andrena carlini, Elis 
plumipes: Lepidoptera; Papilio philenor, Epargyreus tityrus, 
Pieris rapae. 
Acanthaceae (Acanthus family.) 
Dianthera americana. 
Along the water’s edge on the sand spits in Sandusky Bay, 
the water willow forms close communities. The, corolla is two- 
lipped and spreading, the upper lip notched, the lower spreading 
and three-parted. The anthers are bi-lobed, the lobes separated 
and somewhat unequal, giving to the genus its name, since the 
separated lobes appear like two anthers on each filament. The 
styles lies against the upper lip, its position being marked by a 
