4 i6 ANGIOSPERMAEDICOTYLEDONES 



The large white flowers attract numerous insects owing to their conspicuousness 

 and pronounced fragrance. 



Visitors. MacLeod saw 2 Noctuids in Belgium. Herm. Muller (H. M.) chiefly 

 records bees, while in Schleswig-Holstein and Riigen I myself (Kn.) observed Diptera 

 for the most part. Our joint list is as follows. 



A. Coleoptera. (a) Dermestidae: 1. Anthrenus pimpinellae F. (H. M.); 2. A. 

 scrophulariae Z. (H. M.). (b) Mordellidae: 3. Mordella aculeata L. (H. M.). (c) 

 Nitidulidae : 4. Meligethes, po-dvg. (Kn., H. M.). (d) Scarabaeidae : 5. Phyllopertha 

 horticola Z., gnawing the flowers (H. M.). (e) Telephoridae : 6. Dasytes, freq. 

 (H. M.) ; 7. Malachius bipustulatus Z., dvg. the anthers (H. M.). B. Diptera. 

 (a) Muscidae: 8. Sepsis sp. (H. M.). (b) Syrphidae: 9. Ascia podagrica F., freq., 

 skg. and po-dvg. (H. M.); 10. Eristalis arbustorum Z., po-dvg. (Kn.); it. E. pertinax 

 Scop., do. (Kn.); 12. E. tenax Z., do. (Kn.); 13. Helophilus floreus Z., do. (H. M.); 

 14. Rhingia rostrata Z., skg. (Kn., H. M.); 15. Syritta pipiens Z., po-dvg. (Kn., 

 H. M.); 16. Syrphus ribesii Z., skg. and po-dvg. (Kn., H. M.) : 17. Volucella bomby- 

 lans Z., po-dvg. (Kn., H. M.); 18. V. pellucens Z. $>, do. (Kn.j. C. Hymenoptera. 

 (a) Apidae: 19. Andrena albicans Mull. J and $, very numerous, skg. and po-cltg. 

 (H. M.) ; 20. A. dorsata K. % po-cltg. (H. M.) ; 21. A. fasciata Wesm. 5, do. (H. M.); 

 22. A. fulvicrus K. $>, do. (H. M.); 23. A. nitida Fourcr. 5, do. (H. M.); 24. A. 

 tibialis K. 5, skg. (H. M.); 25. A. trimmerana K. 5, skg. and po-cltg. (H. M.); 26. 

 Apis mellifica Z. 5, freq., skg. and po-cltg. (Kn., H. M.); 27. Bombus agrorum F. 

 (Kn.), skg. for a short time (H. M.); 28. B. lapidarius Z. 5, skg. (Kn.); 29. B. 

 pratorum Z. g, skg. and po-cltg. (H. M.) ; 30. Halictus leucozonius Schr. $, po-cltg. 

 (H. M.); 31. H. sexnotatus K. 5, do. (H. M.); 32. Osmia rufa Z. 5, freq., po-cltg. 

 (H.M.); 33. Prosopis armillata Nyl. S, po-dvg. (H. M.); 34. Psithyrus barbutellus 

 K. 5, skg. (b) Formicidae: 35. Lasius niger Z. 5, skg. (H. M.). D. Lepidoptera. 

 Rhopalocera: 36. Pieris brassicae Z., skg. (H. M.); 37. P. napi Z., do. (H. M.) ; 

 38. P. rapae Z., do. (Kn.). 



Cobelli gives 9 Hymenoptera not observed by Herm. Muller (Nuovo Giorn. bot. 

 ital., Firenze, xxv, 1893). 



276. Deutzia Thunb. 



983. D. crenata Sieb. et Zucc. 



Visitors. I observed 3 bees, skg., in the island of Riigen. 1. Apis mellifica 

 Z. 5; 2. Bombus terrester Z. 5; 3. B. lapidarius Z. g- 



Alfken noticed the bee Andrena nigroaenea K. 5 and $, skg., at Bremen. 



277. Ribes L. 



Flowers mostly greenish-yellow in colour, more rarely red or yellow ; frequently 

 associated in many-blossomed racemes. The nectar is free or concealed, and 

 secreted by an epigynous disk. It may be so deeply placed (R. aureum) as to be 

 accessible only to long-tongued bees. Sometimes the flowers are gynodioecious. 



Hermann Muller (' Weit. Beob.,' I, pp. 298-300) gives the following oecological 

 series of our wild and cultivated species of Ribes. R. alpinum is the least specialized, 

 its nectar being secreted in a shallow receptacular depression, and accessible to 

 the shortest-tongued insects. In R. rubrum the depression is much deeper, and its 

 bottom is covered with nectar. In shape it is approximately hemispherical, but 

 its outer part is expanded. The downwardly directed bells of the gooseberry 

 (R. Grossularia), though hardly deeper than those of R. rubrum, are somewhat 



