Vol. XXV] ENTOMOLOGICAL NEWS 225 



September Dragonflies about Mesa, Arizona (Odon.). 



By E. B. WILLIAMSON, Bluffton, Indiana. 



In September, 1912, Mr. B. J. Rainey collected dragon flies 

 extensively about Mesa, Arizona. All species seen by him, 

 with but one exception, were captured, and the following list 

 is probably practically complete for this section at the season 

 when he collected. He kindly turned the entire collection of 

 588 specimens over to me, and furnished the notes on the 

 habits of different species. 



Collections were made at the following locations : 



Chandler, Q miles south of Mesa, desert country with irri- 

 gating ditches. 



Granite Reef Dam, on Salt River, 9 miles above Mesa, col- 

 lected along river, up-stream from dam. 



Tempe, 6 miles west of Mesa, collected along irrigating 

 ditches. 



Mesa is on Salt River. On September 9 he collected along 

 an irrigating ditch, 12 feet wide, i mile south and 3 miles east 

 of Mesa. 



Hetaerina americana. Common everywhere about swift or slow 

 water: on grass and bushes over water. Sept. 11, south of Mesa; 

 Sept. 12, Eastern Canal, Mesa; Sept. 12, Tempe; Sept. 15 and 22, 

 Granite Reef Dam; Sept. 16, east of Mesa; Sept. 18, Salt River, 

 Mesa: 56 $ and 42 9. 



Argia moesta. Sept. 10, Mesa; Sept. 15 and 22, Granite Reef 

 Dam: 2 $ and 6 9. 



Argia sedula. Associated with Hetaerina americana. Sent. 8. 

 along ditch north of Mesa; Sept. 10, 16 and 18, Mesa; Sept. 15 and 

 22, Granite Reef Dam: 80 $ and 59. 



Argia pallens. On islands in Salt River, Mesa, Sept. 18, in grass 

 back from the water; Sept. 22, Granite Reef Dam: 5 $ and 1 9. 



Enallagma civile. Common along irrigating ditches, resting on 

 twigs in water or near water. Sept. 9 and 10, Mesa; Sept, 8, along 

 ditch north of Mesa; Sept. 11, south of Mesa; Sept. 12, Tempe; 

 Sept. 16, east of Mesa: 45 $ and 10 9. 



Enallagma praevarum. August 31, Sept. 18 and 22, Mesa: 10 $ 

 and 2 9. 



Telebasis salva. In grass and on twigs in water. Sept. 8, 9, 10, 

 11, 16 and 18, Mesa, Salt River, north, east, southeast and south of 

 Mesa; Sept. 17, Chandler: 112 $ and 19 9- 



