1909] Graenicher, Wisconsin Flowers and Their Pollination. 4"> 



Flies: 372; 373; 374; 376; 377; 378; 383; 384; 385; 395, 396; 

 400 ; 401 ; 403 ; 408 ; 413 ; 417 ; 436 ; 438 ; 441 ; 442 ; 443 ; 444— all s. of f. p. 



Beetles : 527 ; 537— both f . p. 



Bug : 554, s. 



Eutrop 5 = 5.5% 



Hemitrop 51 = 55.4% 



Allotrop 36 = 39.1% 



3. Aster furcatus Burgess. Smooth-stemmed Aster. 



Flowering period from around August 6 to August 25. The 

 rays are white, and the heads measure from 20 to 22 mm. in dia- 

 meter. A count of 4 heads was taken, and in these the number 

 of ray florets ranged between 11 and 13, and of disk florets be- 

 tween 23 and 29, with an average of 12 for the first, and 25 for 

 the latter. In the ray floret the style protrudes to a length of 3^ 

 mm., from the mouth of the tube, i J / 2 mm. being taken up by the 

 slender stylar branches. 



At first the disk florets are light yellow, but after a few days. 

 a change to reddish-brown (wine color) takes place. The bell- 

 shaped upper part of such a floret is 1 mm. wide at the mouth, 

 and iy 2 mm. deep, and the corolla lobes are spreading. Shortly 

 after emerging from the anther-cylinder the very slender stylar 

 branches become divergent, but later a distinct crossing of the 

 branches is effected. The sweet odor in these flowers is rather 

 faint. 



The following 86 visitors were observed : 



EUTROPOUS. 



Bees : 1 worker, s. ; 2, worker, s. and c. p. ; 4, male, female and 

 worker, s. and c. p. ; 17, female, s. ; 18, male, s. ; 25, male, s. ; 26, male, 

 s. ; 32, male. s. ; 35, female, e. p. ; 36, male, s. ; 39, male, s. ; 44, female, 

 s. ; 55, female, s. ; 58, female, s. 



HEMITROPOUS. 



Bees: 70, female, s. ; 72, female, s. ; 80, female, s. and c. p.; 87, 

 female, s. and c. p. ; 89, female, s. and c. p. ; 99, male, s. ; 102, male and 

 female, s. and c. p. ; 103, female, s. ; 104, male and female, s. and c. p. ; 

 105, male and female, s. and c. p. ; 107, male and female, s. and c. p. ; 

 114, female, s. ; 115, male, s. ; 118, female, s. ; 120, female, s. and c. p.; 

 121, female, s. ; 122, male and female, s. and e. p.; 125, female, s. v 

 130, female, s. ; 135, male and female, s. ; 136, male, s. 



Wasps: 142; 148; 149; 151; 153; 196— all s. 



Flies: 274; 306; 307; 309; 311; 313; 315; 318; 319; 322; 326; 

 330 ; 332— all s. or f . p. 



Butterflies and moths: 450: 451: 460; 466; 469; 470; 474; 475;. 

 485 ; 490 — all s. 



