4o6 



ANGIOSPERMAEMONOCOTYLEDONES 



Visitors. George Darwin saw minute Hymenoptera (particularly Tetrastichus 

 diaphanthus Walk.), flies and beetles (Malthodes brevicoUis Payk.). Herm. MttUer 

 observed dwarf ichneumon-flies. The poUinia cling to the joints of one of the 

 fore-legs of the insects, and, after having bent downwards, are pressed against the 

 stigma of a flower visited later. 



822. Aceras R. Rr. 



As Orchis. 



2630. A. anthropophora R. Br, 



( = Ophrys anthropophora Z.). (Darwin, 

 op. cit., p. 26.) Darwin states that the 

 flower mechanism of this species agrees 

 essentially with that of Orchis mascula 

 and its allies. 



823. Epipogum S. G. Gmel. 



Bee flowers. 



2631. E. aphyllum Sw. (Kerner, 

 'Nat. Hist. PI.,' Eng. Ed. i, II, pp. 226, 257 ; 

 Rohrbach, * Epipogium.') The flowers of 

 this species possess a vanilla-odour, and 

 the perianth is yellowish in colour with 

 a flesh-red spur. The labellum is arched 



FlG- 375- Hertninius aipinum, Lindl. (after Henn. Mailer). A. Side view of a flower that has 

 been over for a considerable time. B. A young flower after removal of all the perianth leaves except the 

 labellum, seen directly from the front. C. A somewhat older flower, which has already lost its pollinia. 



D. A still further developed flower, seen from the side (X 7). E and /^ Pollinia, seen from the front and 

 from the side. G. The middle of a young flower, seen from the front (X 35). a, anther ; a' a', vestigial 

 anthers ; ar and a/, right and left anther-lobes ; br, bract ; c, caudicle ; A, nectar ; ov, ovary ; ^, labellom ; 

 fro, polliniam ; rr, rostellum; sf, stigma. 



