1910] OraenicJier, Bee-Flies in Their Relations to Flowers. 97 



17. Compositae. Eupatorium purpureum. 

 Eupatorium perfoliatum. 

 Eupatorium urticcefolitt m . 

 Liatris spicata. 

 Grindelia squarrosa. 

 Solidago juncea. 

 Solidago canadensis. 

 Solidago gra minifolia . 

 Aster furcatus. 

 Aster novte-angliee. 

 Aster Drummondii. 

 Aster paniculatus. 

 Aster puniceus. 

 Erigeron philadelphicus. 

 Antcnnariu neglecta. 

 Heliopsis scabra. 

 Rudbeckia hirta. 

 Rudbeckia laciuiata. 

 Helianthus strvmosus. 

 Helianthus gigantevs. 

 Bidens Icevis. 

 Eelenium autumnale. 

 Ant he mis Cotula. 

 Arctium Lappa. 



According to this list we are dealing with 37 white and yellow 

 flowers (about 71%) as against 15 red, purple and blue (about 

 2 9%)> m other words more than twice as many white and yellow 

 flowers have received the attention of these flies than red, purple 

 and blue ones, and this is just the opposite of what H. Mueller 

 found. These figures taken in connection with those given for 

 the 9 species of Bombylids which were considered separately jus- 

 tify the conclusion, that these flies do not show a preference for 

 any particular color. Bombylius fulvibasis, for example furnishes 

 at Milwaukee a much greater percentage of visits to white and 

 yellow flowers, while the same insect was seen at Carlinville, 111. 

 on a greater number of red, purple and blue flowers. 



Quite recently Langhoffer 3 published the results of his obser- 

 vations on the visits of two European species of Bombylius: B. 

 discolor and B. fuliginosus. These observations cover a period of 



3) A. Langhoffer Bluetenbiol. Beobacht. an Dipteren. Zeltschr. f. 

 Wissensch. Insektenbiol. Vol. VI, pp. 14-17 and 57-61 (1910). 



