294 AN GIOSPERM AE DICOTYLEDON ES 



The vexillum projects i-i mm. beyond the carina. The alae are curved outwards 

 almost horizontally, providing visiting bees with a surface to grasp while they press 

 down the carina, as convenient as that of T. pratense, which is formed by the elonga- 

 tion of the vexillum. On the other hand, the place suited for the introduction of the 

 proboscis of Lepidoptera is almost as readily visible as in T. alpestre. 



Visitors. Those observed by Herm. Miiller in Thuringia are adapted to the 

 intermediate character of the flower mechanism. They were the following. 



A. Hymenoptera. Apidae: i. Anthophora retusa L. 5, skg. ; 2. Bombus 

 muscorum F. 5, skg., jjl, po-cltg. ; 3. B. proteus Gerst. 5, do. ; 4. B. sylvarum 5, do. ; 

 5. B. variabilis Schmiedekn., var. tristis Seidl. 5, skg. ; 6. Psithyrus rupestris F. $, do. 

 B. Lepidoptera. (a) Rhopalocera : 7. Epinephele hyperanthus Z., skg. ; 8. Hesperia 

 sylvanus Esp., do. ; 9. Lycaena corydon Poda., do.; 10. Melanargia galatea Z., skg. 

 persistently; 11. Pieris napi Z., skg. {5) Sphingidae : 12. Zygaena filipendulae Z., 

 skg.; 13. Z. lonicerae Esp., do. C. Coleoptera. Elateridae: 14. Corymbites 

 holosericeus Oliv., vainly trying to suck. 



Schletterer and von Dalla Torre record the humble-bee Bombus alticola Kriechb., 

 common on Alpine roses, and the leaf-cutting bee Megachile nigriventris Schenck 

 (=M. Ursula Gerst.). 



694. T. arvense L. (Herm. Miiller, 'Fertilisation,' p. 186, 'Weit. Beob.,' 

 II, p. 248; Knuth, 'Weit. Beob. ii. Bl. u. Insekt. a. d. nordfr. Ins.,' p. 222.) The 

 small inconspicuous whitish or pink flowers of this species possess a corolla-tube 

 scarcely 2 mm. long. They are fertile when automatically self-pollinated. 



Visitors. Herm. Miiller chiefly observed bees, less frequently Lepidoptera, 

 as follows. 



A. Hymenoptera. (a) Apidae: 1. Andrena carbonaria Z. J, skg.; 2. A. 

 denticulata K., do. ; 3. A. fuscipes K. S, do. ; 4. A. xanthura K. <j>, do. ; 5. Apis 

 mellifica Z. g, do. ; 6. Bombus lapidarius Z. jjf, do. ; 7. B. rajellus K. $ and $, verv 

 freq., skg. ; 8. Cilissa leporina Pz. % skg. ; 9. Colletes marginatus Z. S, do. ; 10. 

 Diphysis serratulae Pz. J, do. ; 11. Epeolus variegatus Z., do.; 12. Halictus flavipes 

 F. 5, do. ; 13. H. quadricinctus F. 5, do.; 14. H. zonulus Sm. J, do.; 15. Megachile 

 argentata F. J, do.; 16. M. maritima K. J, do.; 17. Osmia spinolae Schenck $ 

 (Thuringia); 18. Saropoda bimaculata P2. S, freq., skg. (b) Sphegidae : 19. Ammo- 

 phila aflinis K. 5, skg. B. Diptera. Muscidae: 20. Gonia capitata Deg., skg. 

 (Buddeberg). C. Lepidoptera. Rhopalocera'. 21. Coenonympha pamphilus Z., 

 skg. (Thuringia) ; 22. Hesperia thaumas Hfn., do.; 23. Lycaena aegon S. V., do.; 

 24. Polyommatus phlaeas Z., do. 



On the island of Riigen, I observed the humble-bee Bombus lapidarius Z. $> skg. 

 Friese mentions for Mecklenburg, on the authority of Brauns and Konow, the 

 very rare bee Andrena nigriceps K. 



Alfken observed the following bees at Bremen. 



1. Bombus agrorum F. 5 ; 2. B. derhamellus K. 5 ; 3. B. lapidarius Z. 5 ; 4- B. 

 pomorum Pz. 5 ; 5. B. soroe'nsis F., var. proteus Gerst. 5 ; 6. Coelioxys quadridentata 

 Z. 5, skg.; 7. Colletes marginatus Z., freq., 5 skg. and po-cltg., J skg. ; 8. Megachile 

 argentata F. $ and &, do. ; 9. Cilissa leporina Pz. J ; 10. Podalirius bimaculatus Pz. 

 $ and S, do. And on the island of Juist. A. Diptera. (a) Asilidae: 1. Asilus 

 albiceps Mg., very freq., skg. (jb) Syrphidae : 2. Eristalis tenax Z. ; 3. Melithreptus 

 sp. ; 4. Syrphus pyrastri Z., very freq. B. Hymenoptera. Apidae : 5. Bombus 

 lucorum Z. 5 and J; 6. B. muscorum F. 5, freq., skg. ; 7. B. terrester Z. J 5 and S; 

 8. Colletes marginatus Z., freq., skg. 



