. Entomology : with special reference to its biological and economic aspects. DISTRIBUTION 377 The Austral region covers the whole of the United Statesand Mexico, except the Boreal mountains and the Tropicallowlands. It comprises three transcontinental belts: (i) theTransition zone, in which the Boreal and the Austral overlap;(2) the Upper Austral; (3) the Lower Austral. The l)utter- FiG. 292. Fig. Distribution of Erynnis manitoba, a Distribution in the United States of butterfly restricted to subarctic and sub- Eudamiis protcns, primarily a tropicalalpine regions.—After Scudder. butterf
. Entomology : with special reference to its biological and economic aspects. DISTRIBUTION 377 The Austral region covers the whole of the United Statesand Mexico, except the Boreal mountains and the Tropicallowlands. It comprises three transcontinental belts: (i) theTransition zone, in which the Boreal and the Austral overlap;(2) the Upper Austral; (3) the Lower Austral. The l)utter- FiG. 292. Fig. Distribution of Erynnis manitoba, a Distribution in the United States of butterfly restricted to subarctic and sub- Eudamiis protcns, primarily a tropicalalpine regions.—After Scudder. butterfly.—After Scudder. fly Eiidanius proteus (Fig. 293) is restricted, generally speak-ing, to the Tropical region and the warmer and more humidportions of the Austral. The Tropical region covers the southern extremity ofFlorida and of Lower California, most of Central America anda narrow strip along the two coasts of Mexico, the westernstrip extending up into California and Arizona. These divisions are based primarily upon the distribution ofmammals, birds and plants, and the three primary divisionsserve almost ecjually well for insects also. In regard to thezones, however, not so much can be said—for insects are to ahigh degree independent of minor differences of instances of this are given beyond. The insect fauna of the United States is upon the whole aheterogeneous assemblage
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
