452 Trans. Acad. Sci. of St. Louis. 
30 to September 26. On eight days, between August 17 and 
September 2, the following guests were noted: — 
Hymenoptera — Apidae: (1) Bombus americanorum F. 6’, 8., ab.; (2) 
B. pennsylvanicus DeG. 8, s.; (3) B. separatus Cr. <j, s.; (4) Melissodes 
perplexa Cr. §'9, 8s. and c. p., freq.; (5) M. obliqua Say 9, 8s. and ¢. p.; 
(6) M. bimaculata Lep. ¢j', 8.; (7) Ceratina dupla Say 9°, 
Lepidoptera — Rhopalocera: (8) Danais archippus F.; A ie ad turnus 
L.; (10) Pieris rapae L.; (11) Colias philodice Gdt., ab.; (12) Pamphila 
cernes B. — L.; pe P. mavataaqua Scud.; (14) P. aubaranh aces ; (16) 
Eudamus tityrus alls 
Di eas uur tisse: ( ae Exoprosopa fasciata Mcq., ab.; (17) Sys- 
toechus vulgaris Lw. — bot 
Kupatorium purrureUm L.—The purplish color of the 
florets and the slender tubes seem to indicate an adaptation 
to butterflies, but the flowers are also visited by long-tongued 
Hymenoptera and Diptera. 
The flowers bloom from August 4 to September 3. The 
list of visitors was observed August 4, 6-8 :— 
Lepidoptera — Rhopalocera: (1) Danais archippus F.; (2) Phyciodes 
nycteis D. —H., (3) Papilio philenor L.; (4) P. turnus L.; (5) Pieris rapae 
L.; (6) P. protodice B.—L.; (7) Colias philodice Gdt.; (8) Pamphila 
peckius Kby.; (9) Pholisora hayhurstii Edw. — all s. 
Hymenoptera — Apidae: (10) Apis mellifica L. 8 ; (11) Bombus pennsyl- 
vanicus DeG. 8 ; (12) B. virginicus Oliv. 8, freq.; (13) Melissodes bimaculata 
Lep. 2; (14) M. aurigenia Cr. ¢; Vespidae: (15) Polistes rubiginosus Lep. ; 
Sphecidae: (16) Ammophila gryphus Sm. — all s. 
Diptera — Bombylidae: (17) Exoprosopa fasciata Mcq.; (18) Systoechus 
vulgaris Lw. — both s.; Syrphidae: (19) Volucella vesiculosa F., f. p. 
EvurpaTORIUM SEROTINUM Michx. — This is a common species, 
blooming from August 16to Sept. 19. The tubes are shorter 
and broader than in EZ. purpureum, and consequently there 
are many more short-tongued species on the flowers. The 
following list was observed on August 24, 25, 27, 28, and 
September 19: — 
Hymenoptera — Apidae: (1) Apis mellifica L. 8, s. and c. p-, ab.; (2) 
Bombus virginicus Oliv. j' 8,8. andc. p., freq.; (8) B. vagans Sm. 9, s. and 
c. p.; (4) B. scutellaris Cr. ¢', 8.; (5) Megachile brevis Say <j’, s.; (6) Heri- 
ades carinatum Cr. ¢'Q, s. and c. p., freq.; Andrenidae: (7) Agapostemon 
viridula F. , 8.; (8) Halictus pectoralis Sm. <j, s.; (9) H. coriaceus Sm. 
GB 9, 8.; Vespidae: (10) Vespa germanica F.; (11) Potistes metricus Say; 
Eumenidae: (12) Eumenes fraternus Say; (13) Odynerus sp.; (14) O. 
