partir] § THE MECHANISMS OF FLOWERS. 171 
_ after a very few visits. Bees, and especially those with abdominal 
 collecting-brushes, are the chief fertilisers of the plant. 
(i 
ie Visitors: A. Hymenoptera—(a) Apide: Bees with abdominal collecting- 
brushes: (1) Osmia interrupta, Schenck, 2 (L. Sld. Thur.) ; (2) O. aurulenta, 
Pz. 2 (Sid., Thur.), very freq. ; (3) O. enea, L. 2 ¢@, (L.), freq.; (4) Diphysis 
serratulee, Pz. 9 ¢ (L. Sld.), freq. ; (5) Megachile Willughbiella, K.? (L.Sld.) ; 
(6) M. pyrina, Lep. 2‘¢, freq. ; (7) M. circumcincta, K. ? ¢ (L. Sld.), ab. ; 
(8) Anthidium manicatum, L.? (L.); (9) A. punctatum, Latr. ? ¢ (Thur), ab. ; 
(10) A. strigatum, Latr. ? ¢ (Thur.), freq. The females of all these species 
collect pollen and suck honey at the same time ; (b) Bees with femoral and 
tibial collecting-baskets ; (11) Bombus agrorum, F. ? %,s., more rarely c.p. ; 
(12) B. terrestris, L. 2 do. ; (13) Apis mellifica, L. 9, very ab., do. ; (14) 
_Eucera longicornis; L. 9 ¢, very ab., only s.; (15) Rhophites canus, Eversm. 
¢ 6 (Thur.),s. ; (16) Andrena labialis, K.?, s.; (17) A. xanthura, K. 2, c.p. ; 
(18) A. convexiuscula, K. 9, s. ande.p.; (19) Halictus rubicundus, Chr. 9, s. 
_ and c.p. ; (20) H. flavipes, K.?,s.; (¢) Cuckoo-bees : (21) Nomada ruficornis, 
 L. 9,°s.; (22) Celioxys, sp. ¢, s. B. Diptera—(a) Conopide ; (23) Conops 
flavipes, L. (4—5), s. only observed once,—thrusting its tongue beneath the 
— vexillum ; (b) Syrphide : (24) Melanostoma mellina, L., b.p. C. Lepidoptera 
_ —(a) Rhopalocera: (25) Lyczena Icarus, Rott., s. ; (26) Hesperia tages, L. s. ; 
(27) H. alveolus, H. s. ; (6) Sphinges: (28) Sesia empiformis, E. (Thur.), s. ; 
(29) Zygena lonicere, Esp. (Thur.), s.; (ce) Bombyces: (30) Porthesia 
 auriflua, S. V. (sucking vainly for honey); (@) Noctuw: (31) Euclidia 
glyphica, L., s. Lepidoptera and Conops thrust their tongues beneath the 
_ vexillum without perceptibly depressing the carina; they were therefore quite 
useless for fertilisation. 
Twenty-seven additional visitors (19 Apide, 5 Lepidoptera. 
3 Diptera) are recorded in my Weitere Beobachtungen, I. p. 246. 
Altogether, I have observed upon Lotus :— 
Apide, Lepidoptera. | Diptera. Total. 
In Low Germany... ae 17 25 1 43 
On the Alps 41 12 3 56 
. 
That is to say, in each hundred species of visitors there are : 
Apide, |Lepidoptera.| Diptera. Total. 
In Low Germany... 39°5 581 2°3 99°9 
On the Alps to'2 21°4 5°38 99°9 
