Graenielter -■ And? cnine Bees and Entomophilous Flora. 95 
ing their origin from a common ancestor. But while A. pech+ 
hami, a bee adapted to the Composilae appears together with the 
early flowers of Helianlhus, A. parnassiae is adapted to a plant 
belonging to quite a different family, and it flies considerably 
later, from August 25th to September 2Gth, daring the blooming 
period of Parnassia. The first specimens of this bee were taken 
in a certain locality south of Whitefish Bay on the bluffs border¬ 
ing Lake Michigan, where the plant Parnassia Caroliniana oc¬ 
curs in large patches with ail abundance of flowers. The latter 
are especially attractive to flies, 17 of the 25 recorded visitors 
belonging to this order, but the bee Andrena parnassiae may be 
observed regularly, season for season, although not a frequent 
insect. It has up to the present time not been met with at any 
other point within our County, nor has it been reported from 
elsewhere. 
Oligotropic species of Andrena. In the foregoing several of 
our oligotropic species have been mentioned in connection with 
the flowers visited. For the sake of completeness a list of all 
of our oligotropic Andreninac is offered below. 
Robertson 2 has published a list of the bees of Carlinville, 
Southern Illinois regarded by him as oligotropic, and 13 of the 
20 species of oligotropic Andrenina-e of that locality occur also 
in our region. They are as follows: 
Name of species. 
Andrena illinoensis, Rob. 
Andrena mariae, Rob. 
Andrena erythrogastra, Ashm. 
Parandrena andrenoides , Cress. 
Andrena erigeniae, Rob. 
Andrena ziziae, Rob. 
Andrena geranii, Rob. 
Andrena geranii maculati, Rob. 
Andrena aliciae, Rob. 
Andrena nubecula, Sm. 
Andrena helianthi, Rob. 
Andrena solidaginis, Rob. 
Andrena asteris, Rob. 
Plants visited for pollen. 
Salix. 
Salix. 
Salix. 
Salix. 
Claytonia Virginica. 
Umb elli ferae. 
Hydrophyllum. 
Geranium maculatum. 
Compositae. 
Compositae. 
Compositae. 
Compositae. 
Compositae. 
