I70 ANGIOSPERMAEDICOTYLEDONES 



The following were recorded by the observers, and for the localities stated. 



MacLeod (Pyrenees), 3 bees (Halictus sp.), an Ichneumonid, and 5 hover-flie 

 Schletterer (Pola), the bee Halictus variipes Mor. 



2067. S. lateriflora Trautv. (Urban, Ber. D. bot. Ges., Berlin, iii, 1885J 

 Loew, 'Bliitenbiol. Beitrage,' I, pp. 24-7.) This species is native to the Caucasi 

 It bears as markedly protogynous wasp flowers as S. nodosa, and their mechanism i^ 

 similar. 



2068. S. peregrina L. (Comes, *Ult. stud.') Comes describes this specie 

 as self-fertile. 



2o6g. S. Scopolii Hoppe. 



Visitors. Plateau noticed the honey-bee. 



2070. S. orientalis L. 

 Visitors. Plateau (Ghent) observed the honey-bee, a saw-fly (Allantus' 



tricinctus Chr.), and a wasp (Odynerus quadratus Pz.). 



2071. S. alpestris J. Gray. (MacLeod, * Pyrene6nbl.,' p. 41.) The flowei 

 of this species are yellow and violet in colour. 



Visitors. MacLeod (Pyrenees) observed more especially a wasp (Vesj 

 sylvestris Scop.); also 2 humble-bees. 



647. Antirrhinum Toum. 



Homogamous bee or humble-bee flowers with valvular mechanism. The 

 entrance is completely closed by the upper and lower lips of the corolla. Tl 

 latter possesses two swellings serving as alighting-platforms, and fitting accurate!) 

 into two depressions of the upper lip. The anthers are completely enclosed 

 the corolla, close against the upper lip, and their pollen is dehisced in t\ 

 rounded masses, which both adhere to the back of a humble-bee forcing its wa) 

 into the flower. Nectar is secreted by the base of the ovary, Medicus descril 

 the stigma as sensitive. 



2072. A. majus L. (Sprengel, *Entd. Geh.,' pp. 320-1; Herm. Milllef 

 'Fertilisation,' pp. 433-4, *Weit. Beob.,' Ill, pp. 29-30; Schulz, 'Beitrage'j 

 Kirchner, 'Flora v. Stuttgart,' p. 580; Knuth, ' Bloemenbiol. Bijdragen.') Tl 

 flowers of this species are bright-purple or rarely white in colour, with a yelloi 

 palate. As long ago observed by Sprengel nectar is secreted by the front par 

 of the base of the ovary, which is smooth, green, fleshy, and usually rati 

 swollen anteriorly. Elsewhere the ovary is of a whitish colour, and clothed with 

 short fine hairs. The nectar remains clinging to the gland, resting below upoi 

 the forwardly directed bases of the anterior filaments, above the spur, into whicl 

 as Sprengel says, it does not flow of its own accord. The spur is short an^ 

 broad, and humble-bees probing for nectar are obliged to insert their probosc 

 into it from below. Access from above and in front is blocked by stiff" capit 

 hairs which cover the anterior filaments where they bend up. 



Visitors. These are exclusively long-tongued bees, especially humble-bee 

 which can easily force open the flowers and creep entirely into them, backii 

 out again with the pollen-masses adhering to their backs. During this procedure" 



