/</ ^.-^ V 

 iu LIBRAR v 







- 



LIST OF ILLUSTRATIONS. 



* 4 * In all the figures of flowers, unless otherwise specified, the letters 

 refer to the same parts, viz. : pistil, / style, p' stigma, st 

 stamen, /filament, /'anther, a petals, pe corolla, co 

 sepals, j. calyx, ca ovary, o honeygland, h pollen, po. 



(after Axeii) 



RO. 



Geranium sylvaticnm . 



1. Stigma of the Alder 



2. Stigma of the Hop ,, ,, 



3. Stigma of the Wheat ,, ,, 



4. Stigma of the Willow ,, ,, 



Z. Stigma of the Flax ,, ,, ... 



*/ o 



6. Stigma of Nuphar ,, ,, 



7. Section of Plantago major ,, ,, 



8. Section of Plumbago Europea ,, ,, 



9. Section of Poteriiim sanguisorba ,, ,, 



10. Section of Sanguisorba officinalis ,, ,, . . . 



11. Mouth-parts of a Wasp 



12. Front part of head of Prosopis, seen from below, with the 



mouth-parts extended (after Miiller) .... 



13. Prosopis (after F. Smith) ....... 



14. Mouth-parts of Polistes (after Miiller) 



15. Mouth-parts of Andrena, seen from below ,, ,, 



16. Mouth-parts of Halictus ,, ,, 



17. Mouth-parts of Panurgus ,, ,, 



1 8. Mouth-parts of Halictoides ,, ,, 



19. Mouth-parts of Chelostoma ,, ,, 



20. Head of Humble-bee (Bombus agrorum), with the mouth- 



parts extended (after Miiller) . . . 



21. Left hind-leg of Prosopis ,, ,, 



22. Left hind-leg of Sphecodes ,, ,, 



23. Sphecodes (after Westwood) .... 



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