1910] Graenicher, Bee-Flies in Their Relations to Flowers. 95 



Alltogether for the 4 flowers: 

 White 25.0%. 



Red, purple and blue 75.0%. 

 The percentages for the same species of Bombylids as derived 

 from Robertson's data for southern Illinois are as follows : 

 i. Anthrax alternate- (6 flowers). White etc. 100%. 



Eed etc. 



2. Anthrax halcyon. (12 flowers). White etc. 100%. 



Red etc. 



3. Bombylius fulvibasis. (6 flowers). White etc. 16.7%. 



Red etc. 83.3%. 



4. Bombylius major. (11 flowers). White etc. 72.7%. 



Red etc. 27.3%. 



5. Systoechus vulgaris. (24 flowers). White etc. 54.2%. 



Red etc. 45.8%. 



6. Sparnopolius fulvus. (21 flowers). White etc. 90.5%. 



Red etc. 9.5%. 



7. Exoprosopa decora. (7 flowers). White etc. 85.7%. 



Red etc. 14.3%. 



8. Exoprosopa fascipennis. (12 flowers). White etc. 83.3%. 



Red etc. 16.7%. 



9. Exoprosopa fasciata. 20 flowers). White etc. 40.0%. 



Red etc. 60.0%. 



From these figures for the 9 species of bee-flies under con- 

 sideration we obtain the following average for each locality : 



White and yellow. Reel, purple and blue. 

 Milwaukee. Wis. 66.1% 33.9% 



Carlinville, 111. 71.5% 28.5% 



Several other species of Bombylids have been observed as 

 flower-visitors in Milwaukee Co., and for the sake of complete- 

 ness I add a list of these, together with the flowers visited : 

 Spogostylum albofasciatum Maeq. visiting Monarda fistulosn. 

 Spogostylum oedipus Fabr. visiting Eupatorium urticwfolium. 

 Aldrichia ehrmanni Coq. visiting Erigeron pliiladelphicus. 

 Anthrax fulviana Say. visiting Aster paniculatus, A. puiiiceits and 



Solidago canadensis. 

 Anthrax lateralis Say. visiting Ceanothus americanus. 

 Anthrax parvicornis Loew. visiting Verbena hastata. 



