JAN. 1907. WISCONSIN FLOWERS AND THEIR POLLINATION. 
25 
female, s. and c. p.; Andrenidse : (lo) Halictus provancheri D. T. 
male, s. ; (ii) H. coriaceus Sm. female, s. and c. p. ; (12) H. albi- 
pennis Rob. male, s. ; (13) H. cressonii Rob. female, s. ; (14) 
H. versatus Rob. female, s. ; (15) Prosopis pygmwa Cr. male, s. ; 
(16) P. modesta Say female, s. ; Crabronidoe: (17) Oxyhelus 
4-notatus Say, s. ; Philanthidse : (18) Cerceris nigresceus Sm., s. ; 
Sphegidae: (19) Ammophila vulgaris Cr., s. ; Eumenidse: (20) 
Hunienes fraternus Say; (21) Odynerus pennsykmiicus Sauss. ; 
(22) 0. conformis Sauss. — all s. 
B. Diptera 
Bombyliidae: (23) Bombylius atriceps Lw. ; Syrphidse: (24) 
Paragiis tibialis 'Fall.; (25) Syrphus americanus Wied. ; (26) 
Meso gramma m-arginata Say; (27) geminata Say; (28) 
Sphwrophoria cylindrica Say; Agromyzidse: (29) Ochthiphila 
poly stigma Meig. ; Tachinidse : (30) Gymnosoma fuliginosa Desv. ; 
(31) Senotainia trilineata v. d. W. ; (32) Ocyptera dosiades 
Walk.; (2,s)Peleteria tessellata Fabr. ; Muscidse : (34) Lticilia 
sylvarum Meig.; (35) L. sericata Meig.; Anthomyidse: (36) 
Phorbia fusciceps Zett. ; (37-38) Phorbia spp. — all s. or f. p. 
C. Coleoptera 
Coccinellidse : (39) Coccinella sanguinea L, s. ; Mordellidse: 
(40) Mordellistena comata Lec. s. 
Allium cernuum Rotli. Nodding wild onion. 
Foerste (6) has given an account of the pollination of this 
species in which he called attention to the proterandry of the 
flowers. Around Milwaukee this plant is in bloom from about 
July 15 to August 29. Through the bending of the scape of 
3 to 4 dm. length just below the umbel the very numerous flowers 
become nodding. At the time of the opening of the first flowers 
along the margin of the inflorescence those in the middle are still 
far behind in their development. The reddish-purple perianth- 
segments contrast rather strongly with the yellow anthers that 
protrude from the mouth of the flower. While the three outer 
perianth-segments are directed outwards, each of the three inner 
ones is erect, and with its wing-shaped margins it encloses the 
6. A. F. Foerste. Fertilization of the wild onion. Am. Nat. Vol. 
XIX. p. 601. (1885). 
