1. Sexual behavior among parasitic Megarhyssa wasps (Hymenoptera: Ichneumonidae)

   • Owen S. Crankshaw
   • Robert W. Matthews

   OriginalPaper Pages: 1 - 7

2. Factors influencing the egg laying of workers in a captive Bombus terrestris colony

   • C. G. J. van Honk
   • P. -F. Röseler
   • J. C. Hoogeveen

   OriginalPaper Pages: 9 - 14

3. An analysis of school structure for tadpoles (Anura: Amphibia)

   • Richard J. Wassersug
   • Andrew M. Lum
   • Michael J. Potel

   OriginalPaper Pages: 15 - 22

4. Structure of association in impala, Aepyceros melampus

   • Martyn G. Murray

   OriginalPaper Pages: 23 - 33

5. The influence of rice rats Oryzomys palustris on the habitat use of the seaside sparrow Ammospiza maritima

   • William Post

   OriginalPaper Pages: 35 - 40

6. Optimal foraging in bumblebees: Why is nectar left behind in flowers?

   • Clayton M. Hodges
   • Larry L. Wolf

   OriginalPaper Pages: 41 - 44

7. Genetic organization of Formica sanguinea populations

   • Pekka Pamilo

   OriginalPaper Pages: 45 - 50

8. The reproductive behavior of Anthidium manicatum (Hymenoptera: Megachilidae) and the significance of size for territorial males

   • Lucia Liu Severinghaus
   • Barbara Harris Kurtak
   • George C. Eickwort

   OriginalPaper Pages: 51 - 58

9. Social hierarchy among siblings in broods of the oystercatcher Haematopus ostralegus

   • Uriel N. Safriel

   OriginalPaper Pages: 59 - 63

10. Interspecific interference competition and mate choice in the soldier beetle, Chauliognathus pennsylvanicus

    • D. Kelly McLain

    OriginalPaper Pages: 65 - 66

11. Pigeon navigation: Charcoal filter removes relevant information from environmental air

    • Hans G. Wallraff
    • Augusto Foà

    OriginalPaper Pages: 67 - 77

12. Foaming in Pachycondyla: A new defense mechanism in ants

    • Ulrich Maschwitz
    • Karla Jessen
    • Eleonore Maschwitz

    OriginalPaper Pages: 79 - 81