7° The Botanical Gazette. [March, 





Lampanida Americana L. l — In the GAZETTE, xiii, 225, 1 



have observed that this flower is in the first stage of irregu- 

 larity, and that bees land upon the style and insert their 

 tongues between the bases of the upper stamens. But, al- 

 though the stigma is turned so as to strike the ventral sur- 

 face of the bee, the stamens still retain the useless habit of 

 covering the style on all sides with pollen. At first the style 

 is straight so that the bee touches only the upper side, but 

 afterwards it bends so that the bee may touch the sides and 

 even the underside near the tip. But still much pollen is 

 wasted by being fixed on the lower side. Megachile exilis, 

 which visits the flower for pollen, regularly turns and hangs 

 under the style so as to clean the pollen off the lower side. 

 this is another illustration of the fact that in dichogamous 

 flowers, which as a rule are only properly visited for nectar, 

 the pollen often acts disadvantageously by attracting insects 

 which remove it and neglect the flowers in the female stage. 

 I he larger bees, which are the only insects adapted to the 

 flower, visit it only for nectar and only touch the upper side 

 of the style. I repeat the list given in the GAZETTE, 1. c. 

 with some additions. 



Visitors: (II days, July 10 to Aug. 28) Hymenoptera 

 \pidac: (1) Aprs mellifica L S; (2) Bombus virginicus Oliv. 



£fr j" * e ^ aratus Cr -<?; ( 4 ) B. americanorum F. & ; (5) 

 " ssodes bimaculata St. Farg. «$?; (6) Megachile brevis Say 



all .suckin</: (7} M pvilic fr ?o c „..,j „ _ . * .. j .-./„,. 



M 



<$£ — all sucking; (7) M 



Andrenidae: 



N Agapostemon radiatus Say <$9,s; (9) Augochlora pura 

 bay ?, c. p.; (10) Halictus Lerouxii St. Farg. 3, s. ; (11) H- 

 conaceus Sm. .59, s; (12) Prosopis affinis Sm. i f. p. ; sieadte: 

 (16) Ammoph, la sp. searching for nectar; Scoliidae: (14 

 Myzme sexcincta F. s. 



Lepiuoptera — Rhopalocera: (15) Pyrameis cardui L . s . ; 

 (loj Ihohsara hayhurstii Fdw.,s. 



Apocymini - cannabinum L.— The flowers are white much 

 smaller than in A. androsamiifolium. and the nectar is lodged 

 in rather shallow receptacles, so that flies and other short- 

 lipped insects can reach it. A. androsaemifoiium, according 



to I ; ud wig, is visited by butterflies and cements its pollen 

 to their tongues. 1 have found the pollen-masses of th. 



species on the maxilla ry and labial palpi of bees, and but 



•See Barnes: Bot. Gaz. x. 349, pi x and vol xi, 99 



•On literature of Re nus set. Mueller: 1% i till ,n of Flowers, 390,631 



