356 ANGIOSPERMAE—DICOTYLEDONES 



that the stamens are crowded together between them and the carpels, and hence 

 a nectar-seeking insect can only insert its proboscis into the receptacle. This 

 mostly results in cross-pollination, for the styles are generally made use of as an 

 alighting-place. Automatic self-pollination regularly takes place, for some of the 

 stigmas always come into contact with the anthers. 



Visitors. — I saw the following in the island of Riigen : all freq., skg. — 



A. Diptera. (a) Muscidae: i. Lucilia caesar Z. ; 2. Scatophaga merdaria Z. 

 (U) Syrphidae : 3. Eristalis arbustorum Z. ; 4. E. pertinax Scop. ; 5. E. sepulcralis, Z.; 

 6. E. tenaxZ. ; 7. Helophilus floreus Z. S; 8. Syritta pipiens Z. B. Hymeno- 

 ptera. Apidae: 9. Bombus lapidarius Z. 5 ; 10. B. terrester Z. 5 and 5. C. Lepi- 

 doptera. Rhopalocera : 11. Pieris sp. 



Alfken observed the following at Bremen. — 



A. Coleoptera. (a) Trixagidae: i. Trixagus fumatus jP., freq. (h) Ceram- 

 bycidae : 2. Strangaha nigra Z., very common. B. Diptera. (a) Empidac: 3. 

 Empis tessellata F., very common. (h) Syrphidae: 4. Ascia podagrica F.; 

 5. Syrphus ribesii Z. C. Hymenoptera. {a) Apidae: 6. Andrena albicans 

 Mull. J ; 7. A. albicrus A!". 5; 8. A. fucata Sm. 5, freq., skg., po-cltg. ; 9. A. fulvida 

 Schenck 5, rare, skg. and po-cltg.; 10. A. nigroaenea K. 5; 11. A. parvula A'. 5; 

 12. Apis mellifica Z. ; 13. Bombus agrorum F. 5 and 5; 14- B. derhamellus K. 5, 

 skg. and po-cltg.; 15. B. hortorum Z. 5. skg.; 16. B. jonellus K. 5, do.; 17. B. 

 lapidarius Z. 5, po-cltg. and skg. ; 18. B. lucorum Z. $ and 5 ; 19. B. muscorum F., 

 skg. and po-cltg.; 20. B. pratorum Z. 5 and J, do. ; 21. B. proteus Gerst. 5 and 5, 

 po-cltg., S skg.; 22. B. sylvarum Z. 5; 23. B. terrester Z. 5, skg. and po-cltg.; 

 24. Coelioxys quadridentata Z. $, skg. ; 25. C. elongata Lep. 5 ; 26. C. rufescens 

 Zf/. $, skg. ; 27. Eriades florisomnis Z. 5 and S ; 28. E. truncorum Z. J; 29. Halictus 

 calceatus Scop. 5; 30. H. leucopus K. 5; 31. H. levis K. 5; 32. H. minutus K. 5; 

 33. H. punctulatus K. } ; 34. H. quadrinotatulus Schenck 5 ; 35. H. tumulorum Z. j ; 

 36. Megachile centuncularis Z. 5 ; 37. Prosopis communis Nyl. S; 38. P. confusa 

 Nyl. 5 ; 39. Psithyrus rupestris F. 5, skg. ib) Ichneumonidae : 40. Mesostenus 

 hgator Gr., skg. (c) Vespidae : 41. Odynerus antilope Pz. J; 42. O. parietum Z. 

 5 and S ; 43. Vespa sylvestris Scop. 5. 



Schenck (Nassau) saw 2 bees (Andrena fucata Sm., and A. varians K.) and 

 a wasp (Vespa norwegica F., one 5). 



Handlirsch records the fossorial wasp Gorytes mystaceus Z. 



von Fricken noticed the following Coleoptera in Westphalia and East Prussia. — 



(a) Nilidulidae : i. Cychramus luteus Oliv. (h) Byturidae : 2. Byturus fumatus 

 F., very freq. (c) Malacodermata : 3. Dasytes niger Z., not rare, id) Curculionidae : 

 4. Anthonomus rubi Hbsi., freq. 



Herm. Miiller observed the following in Westphalia. — 



A. Coleoptera. (a) Cerambycidae: i. Pachyta octomaculata F., freq., nect- 

 1kg. and dvg. ihe flowers, (f)) Dermestidae : 2. Byturus fumatus Z., dvg. the anthers 

 and nect-lkg. B. Diptera. Syrphidae : 3. Rhingia rostrata Z., skg. and po-dvg. ; 

 4. Voluceila pellucensZ.,do. (H.M.). C. Hymenoptera. {a) Apidae: 5. Andrena 

 albicrus .A'. S, skg. (H. RI.) ; 6. A. nigroaenea A". t>, do. ; 7. Apis mellifica Z. 5, extremely 

 common, skg. and po-cltg. ; 8. Bombus agrorum F. 5, freq., skg. ; 9. B. hortorum 

 Z. 5, po-clig. ; 10. B. pratorum Z. 5 and S, freq., skg. and po-cltg. ; 11. B. muscorum 

 F. o, skg.; 12. B. sylvarum Z. 5, do.; 13. Halictus lucidulus Schenck 5, do. 

 (V) Tenthredinidae : 14. Macrophya rustica Z. 



Herm. Miiller saw a hover-fly, 7 bees, a wasp, and a Lepidopterid in the Alps 



(' Alpenblumen,' p. 215). 



