1 889. J BOTANICAL GAZETTE. 1 25 



for having perfected a proterogvnous condition, although 

 visited exclusively for pollen. Even when nectar is present, 

 many insects in search of pollen only visit dichogamous flow- 

 ers in the male stage. We have observed that most of the 

 flowers are discharging pollen, so that insects drop carelessly 

 into them and are evidently surprised when they And them- 

 selves in the stigmatic basin of a new flower. Attracted by 

 the abundant stamens, they do not discover their mistake 

 before they touch the stigma. However, I have sometimes 

 seen Halictus pectoralis turn away from a new flower into 

 which it was about to drop, and fly to an old one. 



On ten days between May 22 and September 18, I took 

 the following insects on the flowers: Hymenoptera— Andren- 

 idm: (1) Agapostemon radiatus Say ?", c.p., ab.. sometimes 

 drowned ; (2) A. nigricornis F. 9 . c. p., ab. ; (3-4) Halic- 

 tus spp., ? , c. p. ; (5) H. pectoralis Sm. 9 , c. p., ab. : (6) 

 H. occidentals Cress. 9 , c. p., sometimes downed ; (7) H. 

 coriaceus Sm. 9 , C. p. do. ; (8) Prosopis sp. 9 , e. p. 



Diptera — Syrfh 







B> 



Wi 



Coleoptera— RhifiphoriiUe: (12) Rhipiphorus limbatus 

 F., drowned. 



Nymfh&a odor at a L. — The flower resembles N. tuberosa, 

 and is likewise female in the first stage. In Florida, in Feb- 

 ruary. I have seen it visited bv Halictus pectoralis Sm. 9 . 



Delpino (178) regards Nymphaea as specially adapted to 



beetles. He states that Piccioli found X. alba abundantly 

 visited by Donacia. 



Dicenira Cucullaria DC— The flower is figured and its 

 mechanism described bv Hildebrand (358). A peculiar in- 

 terest surrounds it from the fact that its time of blooming is 

 correlated with the appearance of long-tongued bees, and in 

 my neighborhood it is the first flower adapted to them. In 

 April, 1886, the first open flower was observed on the 7th. 

 with no visitor. April 9, I found hive-bees collecting pollen 

 and Papilio ajax sucking. April 11, hive-bees were col lect- 

 ln g pollen, Bombvlius, butterflies and the first humble-bees 

 were sucking. On the 12th, humble-bees were present in 

 considerable numbers for the first time, so that it required 



^vu.Mueraoie numoers 101 uie moi u^) »v ~« --1- 



six days for the proper insect relations to become established. 

 The two inner petals are united over the anthers, protect- 



* 



? 





N> 



