602 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



12. LIBELLULA SATURATA Uhler. 



Occasional. 



13. PLATHEMIS LYDIA (Drury). 



Common about the sloughs. 



14. ERYTHEMIS SIMPLICICOLLIS (Say). 



Abundant on the sloughs. 



15. SYMPETRUM CORRUPTUM (Hagen). 



Common on the sloughs. 



16. SYMPETRUM ILLOTTJM (Hagen). 



Occasional on the sloughs. 



17. PACHYDIPLAX LONGIPENNIS (Burmeister). 



One male was taken in the willows across the river from Colusa. 



MARYSVILLE, YUBA COUNTY, CALIFORNIA. 



Marysville is in the great Sacramento Bottoms on the Yuba River 

 near its juncture with the Feather River. Marysville exists only 

 through the protection of its great dykes. Hj^draulic mining on the 

 Yuba has filled the stream so full of tailings that it is but a shifting 

 bed of white sand. Where at one time navigable, its bed is now 

 above the level of the town of Mar3^sville and the stream is wide 

 and very shallow. This has killed any Odonata fauna it may have 

 had at one time. The few species collected were taken in the sloughs 

 back of the dykes across the bridge from the city. 



1. LESTES STULTUS Hagen. 



Several taken (see p. 484). 



2. ENALLAGMA CARIJNCULATUM Morse. 



Not common. 



3. TELEBASIS SALVA (Hagen). 



One seen. 



4. ISCHNURA CERVULA Selys. 



Common ; the most abundant species. 



5. ISCHNURA PERPARVA Selys. 



Common. Orange teneral females abundant. 



6. CELAENURA DENTICOLLIS (Burmeister). 



The second most abundant species. 



7. AESHNA MULTICOLOR Hagen. 



Several seen. 



8. LIBELLULA FORENSIS Hagen. 



Several seen flying with the next. 



9. PLATHEMIS LYDIA (Drury). 



Abundant. 



10. ERYTHEMIS SIMPLICICOLLIS (Say). 



Common. 



11. SYMPETRUM CORRUPTUM (Hagen). 



Very common. The most abundant large dragonfly. Emerging 

 from the sloughs in large numbers. 



