1909] Graenicher, Wisconsin Flowers and Their Pollination. 69 



EUTROPOUS. 



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

 worker, s. and c. p.; 9, male, s. ; 12, worker, s. and c. p.; 13, male, s; 

 16, male, s. ; 17, female, s. and c. p. ; 19, male, s. ; 28, female, s. ; 32, 

 male and female, s. ; 34, male and female, s. and c. p. ; 35, female, s. 

 and c. p. ; 56, male, s. 



HEMITEOPOUS. 



Bees : 86, male, s. ; 99, male, s. ; 100, male, s. ; 102, male and 

 female, s. ; 105, male and female, s. and e. p. ; 106, female, s. ; 107, 

 male, s. ; 114, female, s. and e. p. ; 122, female, s. 



Wasps: 186; 188; 201— all s. 



Flies : 275 ; 283 ; 302 ; 313 ; 316 ; 319 ; 332— all s. or f. p. 



Butterflies: 450 ; 472 ; 480— all s. 



ALLOTROPOUS. 



Flies : 366 ; 369 ; 372 ; 374 ; 379 ; 444— all s. or f. p. 



Beetle : 527, f . p. 



Bugs : 545 ; 554 : 559 — all s. 



Eutrop 14 = 30.4% 



Hemitrop 22 = 47.8% 



Allotrop 10 = 21.8% 



Achillea (Vaill.) L. 

 28. Achillea Millefolium L. Common Yarrow. 



A native of Europe and Asia, this plant is of common occur- 

 rence in our neighborhood, blooming- from about June 14 to at 

 least the middle of September. An account of this species, is given 

 by Hermann Mueller 32 , based on material studied in Germany. 

 The heads are very small, but are massed in considerable number, 

 and form a flat inflorescence. The rays are white, and only 2 mm. 

 long. In the discal florets the tube is 1 mm. deep, and only $4 

 mm. wide at the mouth of the floret. The following list of 80 

 species is due to observations made at Milwaukee, and at Cedar 

 Lake, Washington Co., Wis. 



EUTROPOUS. 

 Bees: 17, female, s. and e. p.; 35, female, s. and c. p. 



HEMITROPOUS. 



Bees: 102, female, s. and c. p.; 106. female, s. and e. p.; 112, 

 female, s. and c. p.; 113, female, s. and e. p.; 116, female, s. and c. p.; 



32) H. Mueller. Die Befruchtung- der Blumen, pp. 391-394. 



