36 
BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 5, NO. 1. 
Stigma. The latter is receptive from the opening of the flower on, 
and later the introrse anthers open one by one. Proterogyny is 
well marked, and the flowers are destined to become cross-pol- 
linated. Where the flowers grow in patches as they usually do, 
visitors are not lacking, and they are attracted by a liberal supply 
of pollen, an agreeable sweet odor, and easily accessible drops of 
nectar secreted at the base of the ovary. 
I have taken the following insects on the flowers : 
A. Hymenoptera 
Apidae: (i) Apis melUfera L. worker, s. ; (2) Bombiis consim- 
ilis Cr. female, s. ; (3) B. ternarius Say female, s. ; (4) Nomada 
cuneata Rob. female, s. ;(5) A', cressonii Rob. male, s. ; (6) Osmia 
purpurea Cr. female, s. ; Andrenidse : (7) Andrena nivalis Sm. 
female, s. ; (8) A. Jiarffordensis Ckll. female, s. ; (9) A. cressonii 
Rob., s. ; (10) A. sigmundi Ckll., female, s. : (11) Augochlora 
viridiila Sm., (12) A. confusa Rob., female, s. and c. p.; 
(13) Agaposfemon radiatus Say, female, s. and c. p.; (14) 
Halicfiis proiancheri D. T., female, s. and c. p.; (15) H. lerouxii 
Lep.. female, s. and c. p.; (16) H. sepliyriis Sm. female, s. and 
c. p.; (17) H. cressonii Rob. female, s. ; (18) H. sparsus Rob., 
female, s. : Eumenidre : (tq) Odynerns pennsyhanicus Sauss., s. 
B. Diptera 
Stratiomyidae : (20) Odonfoniyia pubescens Day; Syrphidse: 
(21) Mesogranima marginafa Say; (22) M. geminata Say; (23) 
Sphcerophoria cylindrica Say; (24) Neoascia globosa Walk. ; (25) 
Erisfalis dinudiatus Wied. ; (26) Helophihis similis i\Iacq. ; (27) 
H. laetits Lw. ; (28) H. chrysostonius Wied.; (29) Mallota cim- 
biciforniis Fall.; (30) Tropidia quadrata Say.; (31) Xylota 
cjuncida Say : (32) Syritta pipiensl,.',T2iQhm\d^: (33) Cistogas- 
ter immacidata Macq. ; (34) Siphona genicidata Deg. ; (35) 
Melanophrys insoJita Walk.; (36) Gonia capitata De G. ; (37) 
Peleteria robiista Wied.; (38) Archytas analis Fabr. ; Sarcophag- 
idoe: (39) Sarcophaga sp. ; Muscidae: (40) Lucilia syharum 
Meig. ; Anthomyidie : (41) Hydrotcea sp. — all s. or f. p. 
C. Lepidoptera 
Rhopalocera : (42) Pontia rapce L. ; s. ; (43) Afrytone zabulon 
Bd. and Lec. — all s. 
