1909] draenicher, Wisconsin Flowers and Their Pollination. 65 



difference in size between the tube of this and of the preceding 

 species; the length amounts to 4 mm; and the width to V/z mm. 

 in the upper, and 1 mm in the lower portion. In this species the 

 lobes of the corolla are erect. 



The following 44 insects were observed : 



EUTROPOUS. 



Bees: 1, worker, s. and c. p.; 3, male, s. ; 4, worker, s. and c. p.; 

 9, male, s. ; 11, male, s. ; 12, male, s. ; 13, female, s. ; 15, male, s. ; 17, 

 female, s. ; 19, male, s. ; 20, male, s. ; 34, male and female, s. and c. p. ; 

 35, female, s. ; 54, female, s. 



HEMITROPOUS. 



Bees: 96, male and female, s. and c. p.; 102, female, s. ; 105, 

 female, s. ; 107. female, s. ; 108, female, s. and c. p. 



Wasps: 186; 196; 203— all s. 



Flies: 272; 274; 281; 304; 307; 315; 316; 319; 332— all s. or f. p. 



Butterflies and moths: 450; 451; 454; 460; 466; 469; 478; 488; 

 490 — all s. 



ALLOTEOPOUS. 



Flies: 352; 372; 377; 442— all s. or f. p. 



Eutrop 14 = 31.8% 



Hemitrop 26 = 59.1% 



Allotrop 4 = 9 -!% 



Lepachys Raf. 

 34. Lepachys pinnata (Vent.) T. & G. Gray-headed Cone-flower. 



I have found this species in bloom from July 1 1 to August 25. 

 Here, too, as in Rudbeckia hirta there is a color contrast between 

 the drooping yellow rays, and the brownish disk. The tube is 

 only 2 mm. long, and its dark-brown lobes are entirely reflexed. 

 The mouth of the floret, which is only 2 A mm. wide is nearly filled 

 out by the anther-cylinder. After pushing out the pollen, the 

 stylar branches separate, and become very strongly divergent. A 

 faint sweet odor is perceptible in the flowers. Robertson" informs 

 us that at Carlinville (southern Illinois) the bee Melissodes obliqua 

 is the most abundant, and most important pollinator. In our region 

 this bee is of rather infrequent occurrence, but I have seen it reg- 

 ularly, although in small number on these flowers. 



Only 33 visitors were taken. 



31) Chas. Robertson. Flowers and insects. Trans. Acad. Sci. St. Louis, 

 Vol. VI, No. 14, p. 468. 



