NO. 2192. DRAGONFLIES, CALIFORNIA AXD NEVADA— KENNEDY. 621 

 10. LIBELLULA PULCHELLA Dmry. 



More common than the last. About the sloughs. 



H. SYMPETRUM CORRUPTUM (Hagen). 



Comjnon on the gravel bars of the river. 



12. SYMPETRUM RUBICUNDULUM DECISUM (Hagen). 



Occasional in the bottoms. 



13. SYMPETRUM MADIDUM (Hagen). 



Two males taken. 



14. SYMPETRUM PALLIPES (Hagen). 



Common, especially in the shade of the willows. 



HUMBOLDT RIVER, GOLCONDA, NEVADA. 



Humboldt Valley at this point is about 2 miles wide; its floor is a 

 level alkali flat, thickly grown up to greasewood bushes, except 

 along the banks of the river, where there are dense thickets of "pin 

 willows." The elevation of the valley at this point is 4,391 feet. 

 On both sides are the low barren sage-covered mountains character- 

 istic of the Nevada. Several large, hot springs occur at Golconda, 

 the Chinese laundry with characteristic oriental thrift using one. 

 The largest is west of the hotel, and with its various subordinate 

 springs irrigates an area of several acres. It has built up a mound 

 one-eighth mile in diameter and 8 feet above the surrounding flat. 

 The largest outlet is a pool 20 by 30 feet, too hot for living insects. 

 At one end of this is a scum composed of dead beetles and other 

 aquatic insects cooked to death. The subordinate springs have pools 

 in various parts of this mound, which vary from cold to very hot. 

 It is in the cooler pools, which support aquatic plants, that Odonata 

 are found. 



The river at Golconda is about a hundred feet wide and 6 feet 

 deep in the channel. It meanders through the alkali flat with such 

 intricate turns that I walked three hours along its bank and returned 

 across lots to my starting point in 20 minutes. As the flat near the 

 river has many areas of salt grass sod, wherever the river cuts into 

 one of these, it undermines the heavy sod which falls off in great 

 squares. Few gravel bai-s occur. The water is yellow with alkali 

 mud, and it fairly swarms with carp. I collected here on August 7 

 and again on August 9. 



1. LESTES CONGENER Hagen. 



Breeding in the warm springs. 



2. LESTES UNGUICULATUS Hagen. 



Several caught around the warm springs. Probably breeding there. 



3. ARGIA EMMA Kennedy. 



One female was taken on the river. The only one seen. 



4. ENALLAGMA ANNA WiUiamson. 



One was found among the Enallagma caught about the springs. 



5. ENALLAGMA CALVERTI Morse. 



Occasional about the springs. 



