THE KANSAS UNIVERSITY 



SCIENCE BULLETIN 



Vol. XIV.] October, 1922. [No. 17. 



Water Insects from a Portion of the Southern Utah 



Desert. 



BY R. C. MOORE, 

 Professor of Geology, University of Kansas ; and 



H. B. HUNGERFORD, 

 Professor of Entomology, University of Kansas. 



INTRODUCTION. 

 THE COLORADO PLATEAU. 



Not the least interesting of that well-known and yet little known 

 country of varied attractions, the Great Western Cordillera of 

 America, is the region of lofty plateaus, towering cliffs and deep, 

 impassable canyons which is known as the Colorado plateau. 

 Bordered on the east by the snow-clad peaks of the Rocky Moun- 

 tains, on the north by the Uinta mountains, and on the west and 

 south by low-lying deserts of the Great Basin and the lower Colo- 

 rado valley, the Colorado plateau includes most of western Colorado, 

 eastern and southern Utah, northern Arizona and northwestern 

 New Mexico. Unlike the serrated peaks, irregular jagged spurs and 

 sharp-topped divides of the Rockies', or of the mountain ranges in 

 the Great Basin and Arizona deserts, the plateau country is a land 

 of elevated, essentially flat-topped tables, which are terminated for 

 the most part in steep, irregularly trending cliffs, and of great 

 canyons which, converging on and culminating in the world-famous 

 canyon of Colorado river, ramify almost every section of the plateau 

 province. The tablelands are formed by hard rock formations 

 which lie in more or less nearly horizontal positions, and the steep 

 cliffs which border the plateaus or wall in the canyons mark the 

 edges of these hard formations. Exceptions to the general archi- 

 tectural scheme of the Colorado plateau country are a few small 

 mountain masses of igneous origin, volcanic cones like the San Fran- 



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