CRUCIFERAE 101 



ditto (H. M.) ; 16. E. pertinax Scop., not infrequent, ditto (H. M.); 17. E. sepulcralis 

 Z, ditto (H. M.); 18. E. tenax ., ditto (Kn.); 19. Rhingia rostrata Z., skg. and 

 po-dvg. (H. M.); 20. Syritta pipiens Z., po-dvg. (H. M.); 21. Syrphus umbellatarum 

 li^., ditto (Kn.). C. Hemiptera. Pentatomidae: 22. Eurydema ornatum Z., boring 

 into the flower and skg. (Budd.). D. Hymenoptera. (a) Apidae: 23. Andrena 

 albicrus K. <$, very freq., skg. (H. M.); 24. A. cingulata F. S, skg. (H. M.); 25. A 

 Idorsata K. 5, skg. and po-dvg. (H. M.); 26. A. nana K. J, skg. (H. M.); 27. Apis 

 imellifica Z. 5, freq.. skg. (H. M., Kn.); 28. Bombus lapidarius Z. , skg. (H. M.) 

 29. Eriades nigricornis Nyl. $, skg. (Budd.); 30. Halictus leucozonius K. 5, skg 

 (H. M.) ; 31. H. malachurus K. $, skg. and po-cltg. (H. M.) ; 32. H. sexnotatus K. 5 

 occasional, skg. (H. M.); 33. H. sexsignatus Schenck j, occasional, skg. (H. M.) 

 I34. Nomada alboguttata H.-Sch. var. pallescens H.-Sch. 5, freq., skg. (H. M.); 35 

 Prosopis hyalinata Sm. J, skg. and po-cltg. (H. M.); 36. Prosopis confusa Nyl. <j> 

 ditto (H. M.). (b) Tenlhredinidae : 37. Cephus pygmaeus Z., nect.-lkg. and po-dvg, 

 (H.M.). C. Lepidoptera. (a) Noctuidae: 38. Euclidia glyphica Z. skg. (H. M.), 

 {b) Rhopalocera: 39. Pieris napi Z. (H. M.), and 40. P. rapae Z. (Kn.); both skg. 



II noted the following in Helgoland (Bot. Jaarb. Dodonaea, Ghent, viii, 1896, 

 P- 38).- 

 Diptera. (a) Muscidae: 1. Calliphora vomitoria Z., po-dvg. (b) Syrphidae: 

 2. Eristalis tenax Z., skg.; and on Riigen : A. Diptera. (a) Syrphtdae: 1. Eristalis 

 anthophorinus Zeft.Z; 2. E. arbustorumZ. J; 3. E. pertinax Z.; 4. E. sepulcralis Z.; 

 5. E. tenax Z.; 6. Helophilus floreus Z.; 7. Syrphus pyrastri Z.; and 8. S.ribesiiZ.; all 

 skg. and po-dvg. (b) Tabanidae : 9. Chrysops caecutiens Z. J. B. Hymenoptera. 

 Apidae: 10. Andrena carbonaria Z. 5; 11. Apis mellifica Z. lj! ; 12. Bombus terrester 

 \\L. 5; and 13. Halictus rubicundus Chr. 5; all skg. and po-cltg., C. Lepidoptera. 

 Rhopalocera : 14. Vanessa atalanta Z. ; 15. V. urticae Z. ; and 16. Pieris sp.; all skg. 



Alfken observed the following in Bremen. 



Apidae. 1. Andrena albicans Mull. }; 2. A. carbonaria Z. 5; 3. A. denticulata 

 K. 5 ; 4. A. flavipes Pz. 5 ; 5. Eriades florisomnis Z. >. 



Heinsius saw the following in Holland (Bot. Jaarb. Dodonaea, Ghent, viii, 1896, 



PP- 6 3-5) 



2 hover-flies Eristalis arbustorum Z. 5, and E. hordeola Deg. 5, a butterfly 

 Pieris brassicae Z. <j>, a short-tongued bee Andrena carbonaria Z. 5 freq., and 4 

 long-tongued bees Podalirius acervorum Z. $, Apis mellifica Z. $<> Bombus hortorum 

 Z. 5, and B. lapidarius Z. 5. 



H. de Vries (Ned. Kruidk. Arch., Nijmegen, v, 1877) observed Apis mellifica 

 Z. 5 : MacLeod records 5 hover-flies, a Muscid, and a Lepidopterid for Flanders (Bot. 

 Jaarb. Dodonaea, Ghent, vi, 1894, p. 207): and Schletterer noticed a ruby-wasp 

 Arge cyanocrocea Forst. at Pola. 



235. S. Cheiranthus Mert. et Koch, y. montana DC. (=Brassica montana 

 DC). (MacLeod, ' Pyreneenbl/) The claws of the yellow petals are so closely held 

 together by the sepals as to form a tube 9-1 1 mm. long. The nectar is therefore 

 only legitimately accessible to the thin proboscis of Lepidoptera. Two of the four 

 nectaries the smaller ones are always at the bases of the short stamens. The two 

 larger ones are at the bases of the long stamens, but they secrete no nectar and (as in 

 the case of Diplotaxis muralis) may be reached from without by clefts between the 

 sepals. The smaller nectaries, on the other hand, are functional, and can only 

 be reached by two narrow passages at the sides of the stigma. When the thin 

 proboscis of an insect is introduced, it first touches the anthers of the four long 



