Carabid Beetles: Their Evolution, Natural History, and by George E. Ball (auth.), Terry L. Erwin, George E. Ball,

By George E. Ball (auth.), Terry L. Erwin, George E. Ball, Donald R. Whitehead, Anne L. Halpern (eds.)

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2Intersubspecific gap size: minimum linear distance between most proximate populations of different subspecies. 45 Canadian Zone. 05). Nonetheless, the expected trend is strongly suggested. Trend reversal observed among subspecies occupying life zones below the Canadian Zone is actually not surprising. Members of these taxa, especially those in the Upper Sonoran Zone, are extremely stenotopic, restricted to single, very specific microhabitats. Populations are surrounded by extremely inhospitable areas; and their isolation therefore reflects severity in the habitat of the barriers rather than their size (gap distance).

Gap sizes between these Table 4. D. 73 See Table 3. for definition. Gap depth: the number of life zones difference between the lowest life zone occupied by members of a subspecies and the lowest life zone represented on the gap. I 2 46 Table 5. D. 12 See Table 3. for definition subspecies are also small; and they contribute to the high variance observed in the sample. ). 10). Based on this failure to establish a clear relationship as expected, it is tempting to suggest that flight is oflittle, if any, importance in present long-range dispersal between and 'maintenance of gene flow among isolated, conspecific Nebria populations.

South American anoles: the geographic 32 differentiation and evolution of the Anolis chrysolepis group (Sauria, Iguanidae). Arquivos de Zoologia 19:1-298. Whitehead, D. R. 1969. Variation and distribution of the intertidal beetle Halocoryza arenaria (Darlington) in Mexico and the United States (Coleoptera: Carabidae). Journal of the New York Entomological Society 77:36-39. ___ . 1972. Classification, phylogeny, and zoogeography of Schizogenius Putzeys (Coleoptera: Carabidae: Scaritini). Quaestiones Entomologicae 8: 131-348.

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