UMBELLIFERAE 503 



1. Fcrm with white flowers. 



At Wageningen, according to Bei- At Ghent and Blankenburg, ac- 



jerinck, the marginal flowers of all the cording to Staes, the stamens may be 



umbellules are either devoid of stamens, vestigial, but are usually fertile. 

 or if these are present they drop off 

 before their anthers dehisce. 



These flowers are therefore always These flowers may therefore be fe- 



female. male, but are often hermaphrodite. 



2. Form with red or greenish-red flowers. 



At Wageningen the stamens are At Ghent and Blankenberg the 



often more or less metamorphosed into stamens, when not degenerate, often 

 petals; the anthers never dehisce. possess anthers that dehisce. 



The whole umbel is female. The umbel may be female (owing 



to degenerate stamens, or anthers which 



do not dehisce); it is often, however, 



hermaphrodite. 



At Wageningen this form can only At Ghent and Blankenberg the two 



reproduce with the aid of the white- forms can reproduce independently of 



flowered one. each other. 



Deichmann (Bot. Centralbl., Cassel, xlix, 1892, p. 271) calls attention to the 

 fact that in Denmark, owing to frequent crossing of the cultivated variety with the 

 wild form the former displays an unwelcome reversion. 



Visitors. I observed the following at Glucksburg (' Bloemenbiol. Bijdragen '). 



A. Coleoptera. (a) Coccinellidae: 1. Coccinella septempunctata L. (b) Tele - 

 phoridae: 2. Cantharis fusca Z. B. Diptera. (a) Muscidae : 3. Lucilia caesar Z. 

 (b) Syrphidae: 4. Syrphus balteatus Deg. C. Hymenoptera. Apidae: 5. Apis 

 mellifica L. %; 6. Bombus terrester Z. 5. All skg., or po-cltg., or po-dvg. : the 

 last running over the inflorescences with great rapidity. 



In Schleswig-Holstein I saw 4 hover-flies, a Muscid, a humble-bee, and a 

 fossorial wasp ('Bl. u. Insekt. a. d. nordfr. Ins.,' p. 155) ; in Helgoland 3 Muscids 

 1. Coelopa frigida Fall. ; 2. Fucellia fucorum Fall. ; 3. Scatophaga stercoraria Z. 

 (' Bl. u. Insekt. a. Helgoland,' p. 35). 



Sickmann records the following for Osnabruck. 



Hymenoptera. (a) Sphegidae: 1. Astata minor Kohl, freq. ; 2. Cerceris 

 labiata F., do. ; 3. C. quinquefasciata Rossi, do. ; 4. Ceropales maculatus F., do. ; 

 5. Crabro alatus Pz. ; 6. C. albilabris F., very common ; 7. C. armatus v. d. L. 

 S; 8. C. brevis v. d. L., freq.; 9. C. clypeatus Schreb.; 10. C. cribrarius Z., very 

 common; 11. C. distinguendus A. Mor.\ 12. C. elongatus v. d. L., freq.; 13. C. 

 exiguus v. d. Z., fairly freq.; 14. C. palmarius Schreb., infreq.; 15. C. peltarius 

 Schreb., very common; 16. C. pygmaeus v. d. Z., rare; 17. C. scutellatus Schev.; 

 18. C. sexcinctus F., freq.; 19. C. vagabundus Pz., do.; 20. C. wesmaeli v. d. L., 

 infreq.; 21. Gorytes fallax Handl. $; 22. G. quadrifasciatus F.\ 23. G. quinque- 

 | cinctus F., rare; 24. Mellinus sabulosus F., freq.; 25. Mimesa equestris F., very 

 common; 26. Oxybelus bipunctatus Oliv., freq.; 27. O. nigripes Oliv., infreq.; 

 28. O. uniglumis Z., very common; 29. Pemphredon shuckardi A. Mor., freq.; 

 30. Pompilus pectinipes v. d. Z., var. campestris Wesm., freq.; 31. P. viaticus Z., 

 very common; 32. P. wesmaeli Thms., infreq.; 33. Psen atratus Pz., very common; 



