SALICINEAE 383 



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

 35. A. ovina Klg. $ and S ; 36. A. parvula ^. 5 and J ; 37. A. praecox Scop. 5 and $ ; 

 38. A. propinqua Schenck 5 and S ; 39. A. rufitarsis Zett. $ and J ; 40. A. thoracica 

 F. 5 and S ; 4 1. A. tibialis K. 5 and J ; 42. A. trimmerana A!', j and J ; 43. A. varians 

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

 derhamellus K. 5 ; 46. B. jonellus K. 5 ; 47. B. lapidarius L. 5 ; 48. B. lucorum L. $ ; 

 49. B. muscorum Z'. 5; 50. B. terrester Z. 5 ; 51. CoUetus cunicularius L. j and j; 

 52, Halictus brevicornis Schenck 5 ; 53. H. calceatus Scop., var. elegans Z^/. 5 ; 

 54. H. flavipes F. j; 55. H. levis K. Ths. j ; 56. H. minutus K. 5 ; 57. H. mono 

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

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

 63. N. bifida Ths. $ and J; 64. N. borealis Zeit. 5 and J; 65. N. fabriciana L. 

 5 and S ; 66. N. fucata Pz. 5 and J ; 67. N. lathburiana K. 5 and J; 68. N. lineola 

 Pz. 5 and J; 69. N. obscura Zeii. 5; 70. N. ruficornis L. } and J; 71. N. succincta 

 /'z. 5 and J, skg. ; 72. N. xanthosticta K. j and J, do. ; 73. Osmia connuta Lir. J ; 

 74. O. rufa L. 5 and J; 75. Podalirius acervorum L. $; 76. Psithyrus vestalis 

 Fourcr. 5, freq. {b) Ichneumonidae \ 77. Banchus falcator F., skg.; 78. Ichneumon 

 sarcitorius L. 5, skg. ; 79. I. suspiciosus Wesim. 5, skg. (f) Tenthredinidae : 

 80. Amauronematus fahraei 7%j. ; 81. A. viduatus Zett.; 82. A. vittatus X<?/>. ; 

 83. Dolerus coruscans Knw.; 84. D. fissusZ^/^. ; 85. D. fumosus Zadd.-, 86. D. 

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

 Ths.; 90. D. rugosus -ffzw. (=D. rugosulus B.T.); 91. Tomostethus fuliginosus 

 Schr. ; 92. Pteronus brevivalvis Ths. {d) Vespidae : 93. Vespa callosus Ths. 5 ; 

 94. V. crabro L. 5. 



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



Loew (Brandenburg), the Bibionid Bibio marci Z. J and 5, 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. Miiller observed the following at Jena. 



A. Coleoptera. {a) Nittdulidae : i. Meligethes sp., nect-lkg. {b) Oedemeridae: 

 t. Oedemera coerulea L., nect-lkg. B. Hymenoptera. {a) Apidae : 3. Andrena 

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

 ?wz. 5, do. (^) Formicidae : 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 



fstated. 



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

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

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

 ptera. Apidae : 3. Andrena albicrus K. 5, 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. $; 

 3. H. quadrinotatulus Schenck $, skg. Frey (Switzeriand), the Bombycid Pygaera 

 anastomosis Z. 



