1909] Qraenieher, Wisconsin Flowers and Their Pollination. 47 



and c. p.; 104, male and female, s. and c. p.; 105, male and female, s. 

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

 109, male, s. ; 115, female, s. and c. p.; 116 male and female, s. and 

 <;. p.; 119, female, s. ; 120, female, s. and c. p.; 122, male and female, s. 

 and c. p.; 125, female, s. : 134, female, s. ; 135, female, s. ; 136, female s. 



Wasps: 142; 143; 144; 149; 151; 153; 196— all s. 



Flies: 300; 302; 306; 307; 308; 313; 314; 315; 316; 318; 319; 322; 

 332 ; 343 ; 344— all s. or f. p. 



Butterflies and moths : 469 ; 473 ; 474 ; 487 ; 500 ; 503— all s. 



ALLOTROPOUS. 



Wasps: 137; 157; 179; 182— all s. 



Parasitic wasps : 245 ; 246 — both s. 



Flies: 348; 356; 367; 369; 372; 373; 378; 379; 380; 383; 385; 391; 

 400; 415; 416; 438; 444 — all s. or f. p. 



Beetles : 510 ; 518 ; 519 ; 527 ; 533 ; 537— all s. or f. p. 



Bugs : 543 ; 553 ; 554— all s. 



Eutrop 16 = 16.8% 



Hemitrop 47 = 49.5% 



Allotrop 32 = 33.7% 



5. Aster prenanthoides Mnhl. Crooked-stem Aster. 



Blooming- period from about August 12 to October 14. The 

 heads examined measured about 30 mm. across, and were sur- 

 rounded by 17 to 20 light blue rays. Shull 25 , counted the florets 

 in 658 heads, and obtained an average of 28 ray florets, and 50 

 disk florets. The yellow bell-shaped florets of the disk undergo 

 the usual change of color to reddish-brown. The bell with its 

 slightly spreading lobes has a length of about \Y\ mm., with a 

 width of 1 mm. Divergence of the stylar branches takes place to 

 a marked degree, and there is no crossing of these branches as in 

 the species of Aster considered heretofore. 



64 visitors : 



EUTROPOUS. 



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

 s. ; 17, female, s. ; 24, female, s. and e. p. ; 35, male and female, s. and c.p. 



HEMITROPOUS. 



Bees : 71, male, s. ; 89, female, s. and c. p. ; 97, female, s. and 

 c. p. ; 99. male and female, s. ; 102, male and female, s. and c. p. ; 104, 

 female, s. ; 105, male and female, s. and e. p.; 108, male. s. ; 114, male, 

 s. ; 118, female, and c. p.; 130, female, s. and c. p.; 132, female, s. 



25) George Harrison Shull. A quantitative study of variation in the 

 bracts, rays, and disk florets of Aster Shortii Hook. A. novo- anghce L., A. 

 puniceus L., and A. prenanthoides MuhL, from Yellow Springs, Ohio. American 

 Naturalist, Vol. XXXVI, No. 422, pp. 111-152, (1902). 



