600 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



Potamogeton in the edge of the pond. I collected about eighty 

 individuals which seemed to reduce the abundance a third or a half. 

 Several exuviae were found clinging to stones about 4 feet above 

 the water. These I have misplaced or lost. 



In life the eyes of the male were bright green above and gray 

 below; those of the female less green above and gray below. 



17. LIBELLULA FORENSIS Hagen. 



On the "Fire Pond." 



18. LIBELLULA SATURATA Uhler. 



On all ponds. 



19. PLATHEMIS LYDLA (Driiry). 



On the small "Fire Pond." 



20. ERYTHEMIS SIMPLICICOLLIS (Say). 



On the "Fire Pond." 



21. SYMPETRUM CORRUPTUM (Hagen). 



On all ponds. 



22. SYMPETRUM ILLOTUM (Hagen). 



On the largest pond. 



23. SYMPETRUM PALLIPES (Hagen). 



Occasional. 



CALISTOGA, NAPA COUNTY, CALIFORNIA. 



The Napa River at this point is a small, sluggish stream and 

 seemed to contam no Odonata. The collecting was done in the 

 streams from a group of warm springs in the fields east of the town. 

 Several acres of flat land at the foot of the low hills on the east side of 

 the narrow valley fairly oozed warm water. The larger springs were 

 so hot that they contained no life. Ditches had been dug in different 

 directions through this boggy area for dramage. In these the water 

 varied from tepid to cool and supported various species of Odonata. 

 Several days of rain had very evidently reduced the collecting at 

 this point. 



1. ENALLAGMA CYATHIGERUM (Charpentier). 



Occasional. 



2. ENALLAGMA CARUNCULATUM Morse. 



3. ISCHNURA CERVULA Selys. 



Occasional about the cooler water. 



4. ISCHNURA PERPARVA Selys. 



Common. 



5. CELAENURA DENTICOLLIS (Burmeister). 



The most abundant species. For habits see page 500. 



6. AESHNA CALIFORNICA Calvert. 



Seen. 



7. AESHNA MULTICOLOR Hagen. 



Several seen. One taken. 



8. LIBELLULA FORENSIS Hagen. 



Occasional. 



