NOTES ON THE LIFE HISTORY AND ECOLOGY OF THE 

 DRAGONFLIES (ODONATA) OF CENTRAL CALIFORNIA 

 AND NEVADA. 



By Clarence Hamilton Kennedy, 



Of Cornell University, Ithaca, New Yorlc. 



INTRODUCTION. 



This is the second oi tliree general papers on Pacific Coast Odonata. 

 The first concerned Washington and Oregon Odonata.^ Tlie third, 

 which is now m preparation, will be based on collecting done in south- 

 ern California during the summer of 1915. 



The object of this series is, first, to give a view of Pacific coast 

 dragonflies and their varied and interesting environments, and, sec- 

 ond, to brmg the data together on which a list of western Odonata 

 can be wi'itten. This Hst is now in preparation and, covering that 

 area of Canada and the United States west of the one hundredth 

 meridian, already includes nearly 200 species. 



In the present paper, as in the fii'st, I have made descriptions and 

 illustrations as complete as possible because much of the Hterature on 

 western dragonflies is inaccessible to even the average college student. 



The trip to Nevada was made possible by a liberal advance of 

 money from Mi\ E. B. Williamson, who later received his pay in a 

 series of the specimens collected. At all times in the work I have 

 received his constant encouragement and help. The greater part of 

 the work on the paper was done in the Stanford University labora- 

 tories under Prof. Vernon L. Kellogg, whose kindly appreciation and 

 critical help have been among the pleasures of the undertaking. The 

 paper was completed in the Cornell University laboratories, where 

 Dr. J. G. Needham very kuidly assisted me on the gomphines. 



A series of specimens covering all the forms discussed in the follow- 

 ing pages, except such as are specifically stated to be elsewhere, has 

 been deposited in the United States National Museum. 



1. A PACIFIC COAST VARIETY OF AGRION AEQUABILE. 

 Since my arrival at Cornell I have received a shipment of inter- 

 estmg California Odonata from Mr. and Mrs. L. R. Reynolds, of San 

 Francisco. These were in teres tmg in that several species were taken 

 at altitudes of 8,000 to 10,200 feet in the Sierras. These are listed m 

 the final section of this paper. 



1 Kennedy, C. H. Notes on The Life History and Ecology of The Dragonflies (Odonata) of Washington 

 and Oregon. Proc. U. S. Nat. Mus., vol. 49, pp. 259-345, July 28, 1915. 



Proceedings U. S. National Museum. Vol. 52-No. 2192. 



483 



