A List of some Coleoptera from the Northern 

 Portions of New Mexico and Arizona. 



By H. F. WICKHAM. 



The region from which the Coleoptera Hsted in the follow- 

 ing pages were obtained, lies along the route of the Atlantic 

 and Pacific Railroad and stretches from the vicinity of Cool- 

 idge, which marks very nearly the top of the Contmental 

 Divide, westward to the valley of the Colorado River. As in 

 this distance the railroad cuts two great mountain chains at 

 nearly right angles, we find that a considerable diversity of 

 plant and animal life manifests itself along the route and the 

 results of collections made give us a very instructive lesson in 

 the influence of altitude upon faunae. The valleys and lower 

 foot hills are covered with the ordinary "scrub" of sage- 

 brush characteristic of like arid areas in the west, while higher 

 up this gives wav to nut-pine and junipers which in their turn 

 are replaced upon the highest altitudes by forests of pine yield- 

 ing timber of sufhcient size for commercial purposes. Each 

 of these "zones," if we may thus designate them, is the home 

 of some species not found in the others, though a number of 

 forms extend over the whole or nearly the whole distance. 

 As a rule the more mountainous districts have furnished those 

 genera and species which seem to some degree characteristic 

 of northern latitudes while the valleys are peopled by repre- 

 sentatives of the great Sonoran fauna which reaches such a 

 high degree of development on the plains of the Southwest. 



In order to facilitate an understanding of the work, a few 

 remarks on the altitude and general features of the collecting 

 grounds may not be out of place. It may also be stated that 



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