130 Trans. Acad. Sci. of St. Louis. 
ited by Bombus males and workers and Melissodes, while bees 
of the other genera are wanting. 
No species is adapted to the lower hymenoptera, although 
10 species were visited by them. They are important for only 
Pycnanthemum, Mentha and Lycopus. The Sphecide, espe- 
cially Ammophila, are the most worthy of mention. Ammo- 
phila occurs as a Visitor of 8 species —all after Monarda, 
except Lophanthus scrophulariefolius. 
Diptera occur as visitors of 19 species. Only two species, 
Mentha and Lycopus, are specially adapted to them. Bom- 
bylius occurs on four early blooming species, and Hxoprosopa 
on 9 late-blooming ones, but they do not occur on the same 
species. Among Tachinide should be mentioned Jurinia, 
which visits 8 species. - 
Butterflies occur on all but five species. They are useful 
visitors of Monarda Bradburiana, and M. fistulosa is specially 
adapted to them. On other flowers they occur as intruders. 
Papilio was observed only on Monarda. 
The ruby-throated humming-bird visits only Monarda. An- 
other plant of the family, Salvia splendens, is specially 
adapted to humming birds. 
Beetles occur only on the six least specialized flowers in the 
table. Species of Rhipiphorus seem to be quite fond of Pye 
nanthemum. 
A few bugs occur on Pycnanthemum. 
