S.P.Myers 1974 Journal Grid 15 (0,18) region, Estancia Medland, 35 km S. of Tandil by road, Ptdo de Modaniaga, Puna de Buenos Aires, Argentina. 19 October (contd) the graph shows a frequency histogram of the mean distribution of birds in the 10 subunits over 6 samples. As did the 18 October data, this set reflects a difference between buffy and golden not only in average density but also in the evenness of the dispersion pattern. This could be a result simply of uneven habitat distribution for buffy, assuming that their preferred micro habitat is different from that of golden and differently distributed. It could be by result if buffy have a denser "maximal packing" and spread out into their preferred areas only after that "maximal packing" is achieved, whereas golden - showing a consistent tendency towards 12.9 birds /hectare - tolerate only lower densities, and because there are more of them, they have achieved a more stable even dispersion, i.e. reached maximal packing in most if not all of the units. On the other hand, if the evenness of golden dispersion is maintained independent of density, as the mean crowding calculation will lack (more comments) then this simple hypothesis will not suffice and one must introduce an incorporate different dispersion system features into the models of the two species dispersing patterns. As the afternoon wore on, buffy appeared to be concentrating more toward the 7-8 region. Golden, on the other hand, remained fairly even throughout the day. Considerable "cumulative use" differences built up between different units; i.e., buffy throughout the 6 samples showed a strong tendency to restrict their presence to only a consistent subset of the ten units; golden on the other hand, showed much less so, although they too appeared to prefer certain units. This can be seen in the following table showing mean #s in each unit: unit 1 2 3 4 5 6 7 8 9 10 Xbuffy 1.2 10.1 1.3 2.7 10.0 13.7 24.7 14.8 1.7 0.7 Xgolden 7 14.5 11.2 9.8 14.0 14.5 15.3 13 11.3 13.9 [illegible]