210 THE FERTILISATION OF FLOWERS. [PART IL. | 
viscid and capable of fecundation spontaneously, and is thus self- 
fertilised, is still undetermined. 
The visitors are exclusively bees. 
(1) Eucera longicornis, L. ¢,s., ab. ; (2) Bombus agrorum, F. 2, s., freq. ; 
(3) Diphysis serratulae, Pz. 9,8; (4) Megachile maritima, K. ¢,s.; (5) M 
versicolor, Sm. 9, s. ande.p. (Brilon, 10 July, 1869.) 
121. LatHyrus TUBEROSUS, L.—I saw this plant visited very 
abundantly by the honey-bee in July 1868,in Thuringia. In suck- 
ing, the bee inserted its proboscis at one side, above one of the ale. 
As it clung to one of the ale and thrust its proboscis in laterally 
between the vexillum and carina, it pressed the carina so far down 
that the style and pollen emerged. In some cases the pollen did 
not come in contact with the bee, in others the stigma and the 
hairs of the style touched the bee on its side. 
When collecting pollen, the bee clung to both ale, thrusting its — 
head and forelegs beneath the vexillum in the middle line. The © 
stigma emerging from the carina came directly in contact with the 
under side of the bee, and cross-fertilisation was effected regularly. 
Besides the honey-bee I only saw two butterflies, a yellow Hesperia, 
and Pieris rape, L., sucking honey on the flowers. 
122. LATHYRUS SILVESTRIS, L.—I saw this plant in Sauerland 
(July 12, 1869) visited also by hive-bees, both sucking and — 
collecting pollen, and by numerous Lepidoptera, which however 
did not effect fertilisation (Rhodocera rhamni, L., Pieris rape, L., 
Vanessa To, L., V. urtice, L., Plusia gamma, L.). 
Delpino <onnhiors as the chief fertiliser of this plant xX ylocopa 
violacea, which does not occur in Westphalia, and justly emphasizes 
the slanting position of the style-brush as an adaptation rendering 
it easier for the bees to depress the carina (178). 
Francis Darwin observed that bees rob Z. silvestris of its honey 
by biting through the vexillum close above the calyx, and almost 
always just above the left honey-passage, which is commonly the 
larger,—a proof of capability to profit by experience. The un- 
symmetrical development of the passages leading to the honey in 
L, silvestris is in relation to the twisting of the style, and thus 
unsymmetrical development of the fruit seems related to both of 
these facts (169). 
123. LATHYRUS MONTANUS, Bernh. (Orobus tuberosus, L.).—In 
Sauerland (July 1869) I saw this plant visited by Zucera longicornis, 
