122 BOTANICAL GAZETTE. [May, 



Miiller found D.^Consolida visited by Bombus hortorum 

 and lapidarius. He also found butterflies, Satyrus and Hes- 

 peria, stealing honey, and I have found a still greater number 

 on this plant. The presence of these insects on bee-flowers 

 is always important, since it enables us to understand how 

 many flowers which originally must have been adapted to 

 bees have been modified to suit butterflies. The white-flow- 

 ered form of this plant might easily become adapted to hawk 

 moths. 



Miiller found D. elatum visited by Bombus hortorum and 



Anthophora personata. 



May 



ing insects on the flowers. Nos. 4 and 6 are characteristic 

 visitors, while 8-18 are intruders : 



Hymenoptera — Afidie: (1) Bombus virgtnicus Oliv. 9 ; 

 (2) B. separatos Cress. 9 (u-13) 6 ; (3) B. vagans Sm. ? : 

 (4) B. pennsylvanicus De G. 9 (16-17); (5) Anthophora 



abrupta Say S (14); all sucking ; (6) Synhalonia speciosa 

 Cress, i 9 , s. and c. p. ; (7) S. atriventris Sm. $ , s. ; (8) 

 Ccratina dulpa Say 9 (5—6; crawling into lower part of spin- 

 whence it may reach a little nectar. Andrenidce : (9) Ago- 

 postemon radio/us Sav 9 ; (10) Halictus sp. 9 , both trying 

 to collect pollen. V " J h 



Lepidoptern—mopaZocera: (11) Danais archiffus F. : 

 (12) Papiho asterias F. : (13) P. troilus L. ; (14) P. tonus 

 L.3 (15) Cohas fhilodice Godt. ; (16) Pamfhila zabulon 



bd.-Lec. ; (17) Eudamus tityrus F. Sfhingida: (18) Deile- 

 ■phila hneata F. 



Nufhar advena Ait.— On the first day the anthers are 

 closed and are crowded in a compact mass under the edges 

 of the broad stigma. Their fleshy tips keep them from be- 

 ing gnawed by beetles. The petals also protect the lower 

 anthers from gnawing-insects, and secrete nectar on their 

 outer faces. At this time the stigma is receptive, and the 

 nower is therefore proterogvnous. The yellow sepals sepa- 

 rate so as to leave a triangular opening over the stigma, so 

 narrow that insects can not enter the flower without crawling 

 over the stigmatic surface. 



On the second and one or two succeeding davs the an- 

 thers are dehiscent. The sepals then are often so widely sep- 

 arated that insects are no longer required to come in contact 

 with the stigma. 



] . i The nu.nl after an insect name indicate the length of the prob is in mil- 



