1. Observations which indicate heterochromatinization of an extra chromosome in the salivary gland cells of Drosophila hybrids

   • H. E. M. de C. Bicudo

   OriginalPaper Pages: 161 - 166

2. Silver staining of Drosophila polytene chromosomes and the effect of hyaluronidase and lysozyme pretreatment

   • V. J. Birstein

   OriginalPaper Pages: 167 - 173

3. Phenetic distances in the Drosophila melanogaster-subgroup species and oviposition-site preference for food components

   • M. Bos
   • A. Boerema

   OriginalPaper Pages: 175 - 183

4. C-heterochromatin variation in the genus Eumigus (Orthoptera: Pamphagoidea)

   • J. P. M. Camacho
   • J. Cabrero
   • E. Víseras

   OriginalPaper Pages: 185 - 188

5. Correlation between characters as related to developmental pattern in Drosophila

   • S. Cavicchi
   • C. Pezzoli
   • G. Giorgi

   OriginalPaper Pages: 189 - 195

6. Extra heterochromatin in natural populations of Gomphocerus sibiricus (Orthoptera: Acrididae)

   • J. Gosálvez
   • C. López-Fernández

   OriginalPaper Pages: 197 - 204

7. Cytotypes within the family Umbelliferae with special reference to the genera Seseli L. and Oenanthe L. (subtribe Seselinae)

   • A. Hore

   OriginalPaper Pages: 205 - 211

8. Population biology of Avena XI. Variation in peripheral isolates of A. barbata

   • S. K. Jain
   • K. N. Rai
   • R. S. Singh

   OriginalPaper Pages: 213 - 215

9. Le caryotype et la spermatogénèse de Mus setulosus (bandes Q, C, G et coloration argentique)

   • M. Jotterand-Bellomo

   OriginalPaper Pages: 217 - 227

10. Mimicry of isozyme adaptive advantage by gene association II. Adh genotype frequency variations in Drosophila cage populations reared at different temperatures

    • S. Sangiorgi
    • E. Pieragostini
    • S. Cavicchi

    OriginalPaper Pages: 229 - 234

11. The somatic and meiotic chromosomes of Puntius conchonius (Cyprinidae) from the Jammu and Kashmir state, India

    • O. P. Sharma
    • A. Agarwal

    OriginalPaper Pages: 235 - 237