SALICINEAE 383 



Ths. 5 and J; 33. A. nigroaenea K. 5 and S; 34. A. nitida Fourcr. 5 and S; 

 35. A. ovina ^/^. 5 and S ; 36. A. parvula K. 5 and iS ; 37. A. praecox Scop. $ and S ; 

 38. A. propinqua Schenck 5 and J ; 39. A. rufitarsis Zetl. 5 and J ; 40. A. thoracica 

 F. 5 and S ; 4 1. A. tibialis K. 5 and S ; 42. A. trimmerana K. 5 and S ; 43. A. varians 

 K. 5 and S; 44. A. xanthura K. $ and S, stylopized, only skg. ; 45. Bombus 

 derhamellus ^. 5 ; 46. B. jonellus ^. 5; 47. B. lapidarius Z. 5 ; 48. IB. lucorum Z. j ; 

 49. B. muscorum F. 5; 50. B. terrester Z. 5; 51. Colletus cunicularius Z. 5 and j; 

 52. Halictus brevicornis Schenck 5 ; 53. H. calceatus Scop., var. elegans Lep. 5 ; 

 54. H. flavipes i^. j; 55. H. levis K. Ths. 5 ; 56. H. minutus K. 5 ; 57. H. morio 

 F. $ ; 58. H. nitidiusculus K. 5 ; 59. H. quadrinotatulus Schenck j ; 60. H. rubicundus 

 Chr. 5; 61. Nomada alboguttata H.-Sch. 5 and S; 62. N. alternata ^. 5 and $; 

 63. N. bifida Ths. $ and S; 64. N. borealis Z^//. 5 and S; 65. N. fabriciana Z. 

 5 and S ; 66. N. fucata /"z. 5 and S ; 67. N. lathburiana K. 5 and t; 68. N. lineola 

 Pz. 5 and S; 69. N. obscura Zetl. 5; 70. N. ruficornis Z. 5 and S; 71. N. succincta 

 Pz. 5 and S, skg. ; 72. N. xanthosticta K. 5 and $, do. ; 73. Osmia connuta Lir. % ; 

 74. O. rufa Z. 5 and S; 75. Podalirius acervorum Z. S; 76. Psithyrus vestalis 

 i^owrcr. 5, freq. {b) Ichneumonidae : 77. Banchus falcator Z'., skg. ; 78. Ichneumon 

 sarcitorius Z. §, skg. ; 79. I. suspiciosus Weslm. 5, skg. (<:) Tenlhredinidae : 

 80. Amauronematus fahraei Ths.; 81. A. viduatus Z^//. ; 82. A. vittatus Lep.; 

 83. Dolerus coruscans Knw.; 84. D. fissus Htg.; 85. D. fumosus Zadd.; 86. D. 

 gonager/'. ; 87. D. haematodis Schr.; 88. D. madidus Z7^. ; 89. D. puncticoUis 

 Ths.; 90. D. rugosus Knw. (=D. rugosulus D.T); 91. Tomostethus fuliginosus 

 Schr.; 92. Pteronus brevivalvis Ths. (d) Vespidae : 93. Vespa callosus Ths. $; 

 94. V. crabro Z. 5. 



The following were recorded by the observers, and for the localities stated. — 



Loew (Brandenburg), the Bibionid Bibio marci Z. J and §, skg. Schletterer and 

 von Dalla Torre (Tyrol), the bee Andrena praecox Scop. S. Friese (Saalthal), the 

 saw-fly Amauronematus histrio Lep. 



2580. S. fragilis L. (Seemen, Ost. bot. Ztg., Wien, xlv, 1895; Herm. Miiller, 

 ' Weit. Beob.,' I, p. 211.) — Seemen and many others observed very varied abnormal 

 flower-forms on this and other species of willow, from which it may be concluded 

 that these plants possess great capacity and tendency to vary their flowers, by increase 

 or decrease of stamens or carpels, by the substitution of organs of one sex by those 

 of another, by transition forms from one sex to another, and so on. 



Visitors.— Herm. MuUer observed the following at Jena. — 



A. Coleoptera. (a) Nitidulidae : i. Meligethes sp., nect-lkg. (h) Oedemeridae : 



2. Oedemera coerulea Z., nect-lkg. B. Hymenoptera. (a) Apidae : 3. Andrena 

 parvula K. j, skg. and po-dvg. ; 4. Apis mellifica Z. 5, do.; 5. Halictus maculatus 

 Sm. 5, do. {d) Forviicidae : 6. Formica rufa Z. 5, nect-lkg. 



2581. S. triandra L. (= S. amygdalina Z.). — 



Visitors. — The following were recorded by the observers, and for the localities 

 stated. — 



Loew (Brandenburg, ' Beitrage,' p. 38), the bee Andrena albicans Miill. 5, skg. 

 Herm. Miiller (' Weit. Beob.,' II, p. 211). — A. Diptera. (a) Bibionidae : i. Dilophus 

 vulgaris Mg. 5 and S, freq. (3) Empidae: 2. Empis opaca F., skg. B. Hymeno- 

 ptera. Apidae : 3. Andrena albicrus K. ^, skg. ; 4. A. sp., do. ; 5. Apis mellifica 

 Z. 5, numerous, skg. and po-dvg. Friese (Saalthal), the bee Andrena ventralis Imh. 

 Alfken (Bremen), 3 bees — i. Andrena albicrus K.'^; 2. Halictus rubicundus Chr. 5; 



3. H. quadrinotatulus Schenck 5, skg. Frey (Switzerland), the Bombycid Pygaera 

 anastomosis Z. 



