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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 49. 



a slough that empties into tho river at the foot of the valley. These 

 sloughs aio alkalme, though with a sluggish current. 



The following species were taken on tho WiUiam Hindnian ranch 

 4 miles west of Baker City on the west slough durmg July, 1909: 



1. LESTES CONGENER Hagen. 



One male specimen. 



Figs. 168-172.— Lestes congenee, nymph. 108. Later.^l view. 169. Dors.\l vjew. 170. Labium. 

 171. Head, l.vteral view. 172. Segments 9 and 10. 



2. LESTES UNCATUS Kirby. 



This was common about the stagnant alkaline pools. 



3. LESTES UNGUICULATUS Hagen. 



This occurred commonly with the preceding species. 



4. LESTES DISJUNCTUS Selys. 



Two males of tliis species were taken. 



