()16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



8. AESHNA PALMATA Hagen. 



Among a series of exuviae collected here Dr. E. M. Walker found 

 a single mutilated exuvia which he thought might be this species. 

 No imagoes were seen. I doubt if it occui-s other than as a straggler 

 at this altitude. 



9. LIBELLULA QUADRIMACCILATA Linnaeus. 



Common. 



10. SYMPETRUM OB TRIISUM (Hagen). 



One male caught. Rare. 



11. SYMPETRUM PALLIPES (Hagen). 



Not common. 



12. LEUCORRHINIA GLACULIS Hagen. 



Fairly swarming over one of the lakes. The bushes about the 

 shore were alive with pairs in copulation and numerous single indi- 

 viduals. 



RENO, NEVADA. 



Reno, at an elevation of 4,500 feet, lies in a small valley, whose 

 level floor with its vivid green alfaKa fields is in striking contrast to 

 the brown of the massive Sierra foothills which surround it. The 

 Truckee River on its course eastward to the Nevada Desert passes 

 through this valley but gives the most of its water to the irrigation 

 canals which carry it to the alfalfa fields. Its bed is an almost con- 

 tinuous gravel bar and it supports but httle odonate Ufe. Back from 

 the river are numerous sloughs of waste irrigating water, common in 

 any overirrigated country, which fairly swarm with various pond 

 species. 



1. LESTES CONGENER Hagen. 



Common about all sloughs. 



2. LESTES UNCATUS Kirby. 



Common about the sloughs, 



3. ARGIA EMMA Kennedy. 



One pair of Argia was seen on the river near the Asylum. Prob- 

 ably this species. 



4. ENALLAGMA ANNA Williamson. 



This was the only Enallagma taken in the valley, though two others 

 probably occurred there. I had an excellent chance to observe its 

 habits. It was very active and flew busily back and forth along the 

 flowing irrigating ditches. Copulation lasted several minutes. In 

 ovipositing, the females painstakingly put their eggs into the sub- 

 merged stems of aquatic plants, at which task they were usually 

 accompanied by the males until there was danger of submergence, 

 when these left the females to themselves. Frequently females 

 would be submerged for many minutes. Nymphs were common among 

 the Potamogeton stems in the more weedy ditches. A large series of 

 this species was taken. 



