240 



ANGIOSPERMAE-—DICOTYLEDONES 



'{6) Chysididae: 29. Chrysis ignita Z., skg. (H. M.). (c) Evaniidae: 30. Gasterup- 

 tion affectator F., skg. (H. M.) ; 31. G. jaculator F., do. (H. M.). {d) Ichneuvionidae: 

 32. Ichneumon sp., skg. (H. RL). (e) Scoliidae: 33. Tiphia minuta v. d. L. J, skg. 

 (H.M.). (/) Sphegidae: 34. Crabro chrysostoma Lep. $, skg. (Budd.); 35. C. 

 clavipes L., do. (H.M.); 36. C. dives B.-Sch.t,, do. (Budd.); 37. C. elongatulus 

 -■. d. L. $, do. (H. M.); 38. C. guttatus v. d. L. S, do. (Budd.); 39. Oxybelus bellus 

 DahlL, do. (H.M.) ; 40. Pseudagenia carbonaria Scop, i, do. (H.M.) ; 41. Trypoxylon 

 figulus L., do. (H. M.). ig) Vespidae: 42. Odynerus parietum L.t, skg. (H. M., 

 Budd.); 43. Polistes gallica Z., do. (Budd.). 



Loew observed a Syrphid, Syritta pipiens Z., skg., and the honey-bee, Apis 

 mellifica Z. 5, skg., in the Berlin Botanic Garden ; F. F. Kohl saw the wasp Eumenes 

 pomiformis F., in the Tyrol. 



The variety divaricata Tenore was seen by Schletterer to be visited at Pola 

 by the bee Prosopis clypearis Schenck. 



605. R. bracteosa DC. (Knulh, ' Biutenbiol. Beob. a. d. Ins. Capri.')— The 

 flower mechanism and means of attraction in this species agree with those of 

 R. graveolens. 



Visitors. — I observed at Capri only a few Diptera and a species of ant. 



I"IG. 74. Dictamnus a/6us, L. (Froin nature.) A. Flower in the Grst {male) condition: the 

 anthers (<2 1 occupy the entrance to the flower. B. Flower in the second condition: the stigma (j) 

 protrudes from among the stamens. (Natural size.) 



178. Dictamnus Tourn. 



Protandrous hymenoplerid flowers. 



606. D. albus L. (Delpino, ' Ult. oss.,' p. 145 ; Hildebrand, Bot. Ztg., Leipzig, 

 .x.^viii, 1870; Loew, ' BlUtenbiol. Floristik,' p. 214 ; Urban, Jahrb. bot. Gart., Berlin, 

 ii, 1883, pp. 36-404 ; K. F. Jordan, Ber. D. bot. Ges., Berlin, v, 1887, pp. 327-44 ; 

 Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, pp. 203, 225; Knuth, ' Bloemenbiol. Bij- 

 dragen.') — The flower mechanism closely resembles that of Aesculus Hippocastanum. 

 As Delpino first demonstrated, the pollen-covered stamens project in the first stage 

 from the flowers (which exhale an odour of citron), while in the second stage the 

 mature stigma protrudes. These parts serve as alighting- and resting-places for 

 insect visitors. During the male stage the stamens lie upon the under-lip of the 

 flower, curving upwards to its entrance, while the style is hidden in the middle 



