454 Trans. Acad. Sci. of St. Louis. 
Liatris pycnostacHya Michx.—The plants grow on 
prairies and are often collected in conspicuous patches. The 
stems rise from eight to sixteen decimetres high and bear 
long spikes of heads, each one of which contains five or six 
rose-purple flowers. 
All of the flowers are perfect. Pollen is carried out and 
exposed on the long divisions of the style. The corolla 
tubes are from seven to eight millimetres long. The visitors 
are long-tongued bees and flies, and butterflies. By far 
the most abundant visitor observed by me is HLxoprosopa 
fasciata. 
Liatris pycnostachya blooms from July 21 to August 14. 
The following visitors were observed on August 9 and 10:— 
Hymenoptera — Apidae: (1) Bombus EEE we F. §'8, 8. and ¢. p., 
freq.; (2) B. virginicus Oliv. 8, s. and c. (8) B. separatus Cr. J 8, 8-5 
freq.; (4) Melissodes outers Cr. are: Sr 6) M. obliqua Say ¢'?, 8. and 
¢. p., freq.; (6) M. aurigenia Cr. ake , freq., (7) Ceratina dupla Say 2, 
s., freq.; (8) easels latimanus Say ('Q, 8., freq.; (9) M. inimica 
Cr. 9, s. and c. p.; (10) Epeolus remigatus F. ¢'Q, s.; Andrenidae: 
(11) acne Tigkctins Say 9, c. p., freq.; (12) Agapostemon viridula F. 
SP; 8, 
balck bepunen (18) Danais archippus F.; (14) Argynnis 
idalia Dru.; (15) Pieris rapae L.; (16) Colias philodice Gadt., freq.; (17) 
Papilio eiterina Fy “Se Saye L.; (19) Pamphila peckius Kby., freq. ; 
20) P. cernes B.— ; (21) P. metacomet Harr.; (22) Eudamus tity- 
rus F.; ine ag Sta, Scepets fulvicollis Hbn.—all s 
Diptera — Bombylidae: (24) Exoprosopa fasciata Mise: very ab.; (25) 
Systoechus vulgaris Lw.; ser ices (26) Physocephala texana Will.; (27) 
Stylogaister biannulata ay — 
SoLIDAGO MISSOURIENSIS Nutt.— Visitors observed on 
August 9, 17, 19:— 
Hymenoptera — Apidae: (1) Apis mellifica L. 8,s., one; (2) Melissodes 
obliqua Say 9, s. and c. p., freq.; (8) M. perplexa a Cr. Q,s. and c. p.; (4) 
pethaes = Say <j’, 3.; Andrenidae: (5) oar ica Sm. 9,58. 
and c. p.; (6) H. ligatus Say 9, 8. andc. p., ab.; (7) H. fasciatus Nyl. 9, 
8.; (8) a confusus Sm. ‘9, s. andc. p. ha ) H. albipennis Rob. 9, 
s. and c. p.; (10) H. tegularis Rob. 9,8. and c. p.; — —— sim- 
ilis Rob. 9, s.; (12) Prosopis — Cr. 9, s., freq.; Vespidae: (13) 
Polistes pallipes Lep., s.; Zum ae: (14) Eumenes fraternus dey, 8.5 
(15) Odynerus — Sauss., se as. (16) O. vagus Sauss., s.; (17) O. 
anormis Say, s.; Crabronidae: (18) Crabro interruptus Lep., s.; (19) C. 
chrysarginus Lepis 8.; (20) Oxybelus frontalis Rob., s.; Philanthidae: (21) 
Philanthus ventilabris F., s.; (22) Eucerceris zonatus Say, s.; (23) Cerceris 
