Robertson — Flowers and Insects. 467 
This plant holds an important place in the economy of 
Calliopsis albitarsis and Andrena rudbeckiae. 
It blooms from June Ist to September 16th, though the 
last of July ends its maximum blooming period. 
The list of visitors is the result of absaesitonl made on 
thirteen days, between June 9 and August 22 :— 
Hymenoptera — Apidae: (1) Apis mellifica L. 8, s-; (2) Melissodes per- 
plexa Cr. 9,8. and c. p., freq.; (3) M. dentiventris Sm. 9, s.; (4 ) M.- ob- 
liqua Say (', s.; (5) Ceratina dupla Say 9, s. andc. p.; (6) Megachile 
addenda Cr. 9,s.; (7) M. pugnata Say 9,c.p.; (8) M. montivagaCr. 9,c 
p.; (9) M. brevis Say 9, s.; (10) Coelioxys altilis Cr. ’, s.; (11) Epeolus 
lunatus Say ', s.; (12) Nomada annulata Sm. 32, 8-3 (13) Calliopsis 
albitarsis Cr. OP, 8. and c. p., ab.; (14) C. illinoensis Cr.f'9, s. and c. p., 
; Andrenidae: (15) Andrena rudbeckiae Rob. g'9, s. andc. p., ab.; (16) 
Agapostemon viridula F. Q, s. and c. p.; (17) Augochlora pura Say 9, s. 
and c. p.; (18) Halictus sp. 9, c. p.; (19) H. pectoralis Sm. 9, s. and c. 
D., freq.; (20) H. ligatus Say 9,8. and c. p.; (21) H. pilosus Sm. 9, s. and 
c. p.; (22) H. Deak Rob. <j, 8.; (28) H. confusus Sm. j'9, 8. and c. p.; 
~Psegsim (24) Odynerus arvensis Sauss.; (25) O. anormis Say; Bembeci- 
: (26) i acaiie pict: Sm.; Sphecidae: (27) Ammophila intercepta 
Seo freq.; (28) A. pictipennis Walsh; (29) Priononyx thomae F.— all s. 
Diptera — Stratiomyidae: (30) Odontomyia nigrirostris Lw., s.; Bombyli- 
dae: (31) Exoprosopa decora Lw.; (32) E ao Say; (38) Anthrax 
parvicornis Lw.; (34) Sparnopolits fulvus Wd. —all four s.; Conopidae. 
(85) Zodion futvitrons Say,s.; Syrphidae: (36) "atrats tibialis Fll.; (87) 
Allograpta obliqua Say; (38) Mesograpta marginata Say, ab.; (39) Sphae- 
Saggshy cylindrica Say; (40) Erista . dimidiatus Wd.; (41) E. latifrons 
ab.; (42) E. transversus Wd., ab.; (48) E. aeneus F.; (44) Helophilus 
biitccas Lw.; (45) Tropidia mamillata Lw.; (46) Syritta pipiens L.; 
Tachinidae: (47) Deities euchenor WIK., freq.; (48) Jurinia apicifera WIk.; 
(49) Cuphocera ruficauda v. d. W.; (50) Acroglossa hesperidarum Will., 
freq.; Anthomyidae: (51) sp.; (52) Coenosia sp. —all s. orf. p, 
Lepidoptera — Rhopatocera: (53) Argynnis cybele F.; (54) Phyciodes 
bycteis D.— H.; (55) P. tharos Dru.; (56) Liminitis disippus Gdt.; (57) 
sary calanus cee (58) sre tee te thoe B.—L.; (59) Pieris rapae 
-3 (60) Colias phifodice Gdt.; (61) Pamphila peckius Kby.; (62) P. cernes 
—L.; Heterocera: (63) Scepsis fulvicollis Hbn.; (64) Plusia simplex 
Gn.— all s 
Coleoptera — Buprestidae: (65) Acmaeodera pulchella Hbst.; Cerambyci- 
dae: (66) Typocerus sinuatus Newm., freq.; Chrysomelidae: (67) Diabrotica 
atripennis Say; Mordellidae: (68) Mordella scutellaris F.; Meloidae: (69) 
“ometiaman unicolor Kby.; Curculionidae: (70) Centrinus scutellum-album 
y¥—all f. p. 
Rupsecxra tritopa L.— The stems grow from six to fif- 
teen decimetres high and bear numerous small heads with 
black-purple centers and yellow rays. The heads expand 
