NO.2107. DRAGONFLIES, WASHINGTON AND OREGON— KENNEDY. 341 



(The Stanford collection contains a specimen from Prescott, Wash- 

 ington.)^ 



8. ARGIA VIVIDA Hagen. 



I have taken this only on Satus Creek. A few specimens were 

 taken south of Alfalfa, but it was much more abundant on Logie 

 Creek, an upper tributary of Satus. It was emei^ng June 15. Old 

 specimens were taken August 24. 



9. ENALLAGMA CALVERTI Morse. 



Common about alkaline ponds from May to July, when it is cUs- 

 placed by carunculatum. 



10. ENALLAGMA CARUNCULATUM Morse. 



This species appears about the alkaline ponds in June and by 

 August is the most abundant species. 



11. ENALLAGMA CLAUSUM Morse. 



I took 2 males on Nigger Pond July 21, 1012. 



12. ENALLAGMA CYATHIGERUM (Charpentier). 



This species is common on the river and running creeks from May 

 to September. It is most abundant in June. 



13. AMPmAGRION SAUCIUM (Burmeister). 



Nowhere abundant, but occasional about the various ponds. 



14. ISCHNURA CERVULA Selys. 



Found about all the ponds. It reaches its greatest abundance in * 

 June, but is the earliest spring species arid lasts till frost. 



15. ISCHNURA PERPARVA Selys. 



Found throughout the season, perhaps more abundant about the 

 fresher ponds. 



16. OPmOGOMPHUS OCCIDENTIS Hagen. 



I have a male and a female taken on Satus Creek south of AKalfa. 

 The female was caught resting on a willow in copulation with a male 

 severus, which was abundant here. The identity of this and the 

 next species I shall discuss in a forthcoming paper based on material 

 collected by me in California. 



17. OPHIOGOMPHUS SEVERUS Hagen. 



Abundant on Satus Creek south of Alfalfa. Here the emergence 

 commenced the second week in June and lasted until the first week 

 in July. It occurred from 9 o'clock in the morning until 4 o'clock in 

 the afternoon, the nymph seldom crawling more than 6 inches from 

 the water. Oviposition was most common on about August 1 and 

 the last specimens were seen August 24. Oviposition occurred 

 almost altogether on the riffles, but emergence was almost altogether 

 along the deeper mud-bottomed pools. In copulation the male 

 sought the female while she rested on a stone. Copulation occurred 

 immediately after the male grasped the female, and after a short 



1 1 found this species abundant in California on the Sacramento River at Colusa, on the Feather River at 

 Oroville, and on the Chico River at Chico. The species was emerging June 10 at Colusa and was ovipositing 

 on the Chico River June 17. 



