68 Bulletin Wisconsin Natural History Society. [Vol. 7. Nos. 1-2. 



Beetles : 514 ; 534 ; 537— all s. or f . p. 



Bugs — 553 ; 554 — both s. 



Eutrop 25 = 36.3% 



Hemitrop 33 = 47.8% 



Allotrop 11 = 15.9% 



26. Helianthus giganteus L. Giant Sunflower. 



The flowers have been observed from July 27 to August 31. 

 The tube of the discal floret is slightly wider than that of the 

 preceding species, but otherwise the same dimensions exist. These 

 flowers do not seem to be as attractive to insects as those of H. 

 strumosus, and I have not been able to raise the list of visitors 

 above 24 species. 



EUTROPOUS. 



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

 s. and c. p. ; 6, worker, s. and c. p. ; 7, male and female, s. ; 13, male, 

 female and worker, s. ; 20, made and female, s. and c. p. ; 34, male, s. ; 

 63, male, s. 



HEMITROPOUS. 



Bees : 86, female, s. and c. p. ; 94, male and female, s. and c. p. ; 

 96, female, s. ; 102, female, s. 

 Wasp: 151, s. 



Flies: 283; 307; 313; 319— all s. or f. p. 

 Butterflies: 448; 450; 451— all s. 



ALLOTROPOUS. 



Flies : 377 ; 384— both s. and f. 0. 



Beetle : 527, f. p. 



Eutrop 9 35 37.5% 



Hemitrop 12 = 50.0% 



Allotrop 3 = 12.5% 



Helenium L. 

 27. Helenium autumnale L. Sneeze-weed. 



My observations cover the period between August 10 and Sep- 

 tember 7. All of the parts of the flowers are yellow. The length 

 of the ray florets with their broad 3 lobed rays amounts to 1 cm., 

 and their styles protrude 3 mm. beyond the mouths of the florets. 

 In the discal floret the tube reaches a length of 2 T / 2 mm. and a 

 width of % mm. The stylar branches become divergent, and fin- 

 ally spread out horizontally. 



46 visitors were noted as follows : 



