Moore AND Hixgerford: AVatkk Insects. 415 



coming of rain. These little pools of moderately clear water afford 

 sanctuary for such water-breeding or water-living animals as in- 

 habit the region, and in some cases it is a populous and assorted 

 community that crowds together. 



Springs may be mentioned among the surface waters of southern 

 Utah, although they are not numerous, and the water from them 

 very short h^ sinks into the ground. They are in many cases nearly 

 permanent, and are an important source of supply, especially as 

 regards the uses of man. None of the springs or seepages in the 

 plateau region studied has a fiow of more than a few gallons an 

 hour. 



It is freciuently a number of miles from one spring, ''tank" or 

 other permanent water source to another. 



FIELD WORK. 



In the summer of 1921 and 1922, Mr. Moore, with a party of four 

 assistants, was assigned by the United States Geological Survey to 

 make an examination of a portion of the high plateaus of southern 

 Utah, with reference to coal resources and possibilities of oil and 

 gas development. A detailed geological map of approximately 

 3,000 square miles was made, and reconnoissance study of a very 

 much larger area was completed. The region mapped comprises 

 most of central eastern Garfield county, a portion of central Wayne 

 county, and eastern Kane county, Utah. Although the primary 

 purpose of this work had to do with possible coal, oil and gas re- 

 sources, special attention was given to water supply, for the region 

 is a^emidesert. Not only was it important for the party to find 

 water for camp purposes, but the possible development of water 

 supply is in all cases the most important consideration in the utiliza- 

 tion of such a region. During the course of this work, wherever 

 water insects were found, and where it was possible without inter- 

 ruption of the main objects of the work, collections were made. 

 Since no other similar collections have been reported from this 

 region, and since the distribution of water insects in this region is 

 both of biological and general entomological interest, the results 

 are here presented. Identification and special notes on the species 

 found are the work of Mr. Hungerford. 



DESCRIPTION OF COLLECTIONS. 



Since the collections of water insects to be noted below were 

 gathered as opportunity offered and not as a part of a systematic 

 faunal survey, the data are perhaps somewhat fragmentary and 

 scattered. However, since the sources of water supply in such 



