502 The Ohio Naturalist. [Vol. XII, No. 6, 



Visitors — Diptera; Sphaerophora cylindrica: Hymenoptera; 

 Microbembex monodonta, Agapostemon radiatus, Odynenis fora- 

 miiiata, 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 approximateh^ 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 possibl}^ in this way could affect 

 cross-pollination. 



Visitors — Diptera; Syritta pipiens, Allograpta obliqua, Syr- 

 phus americana, Eristalis tenax: Hymenoptera; Agapostemon 

 radiatus, A. splendens, Ccratina dupla, Odynerus foraminata, 

 Melissodes sp., Bombus virginicus, B. americanorum, 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 



