NO. 2107. DRAG0NFLIE8, WASHINGTON AND OREGON— KENNEDY. 289 



probably calif ornica, which I took on Dry Creek not many miles 

 distant. 



I next found Argia vivida at Sherman, Oregon, which is on the 

 Columbia River about 2 miles east of the mouth of the Deschutes 

 Canyon. The Columbia Gorge at this point is from two to three 

 thousand feet deep. Its sides are massive brown hills, with here and 

 there solitary green ranches on spring-fed benches a thousand feet 

 above the river. Its bottom on either side is a narrow strip of white 

 sand dunes lying between the gravelly beach and the foot of the hills. 

 Among these sand dunes is the box-car railroad station called Sher- 

 man, Oregon. Opening into the gorge about 1 mile west of the 

 station is a narrow canyon, which is occupied by the Y of the Deschutes 

 road. Thi'ough this canyon trickles a small stream arising from nu- 

 merous springs, which meanders in the mouth of this canyon through 

 a succession of swampy and rocky holes. This stream swarms with 

 Argia vivida. They sat on the stones along the stream, and because 

 of the numerous rocks, and the heat, were difficult to catch. The 

 constant west -wind blowing up the Columbia Gorge had carried many 

 of the Argias as far up as the Sherman station. They were associated 

 in this side canyon with Amphiagrion saucium (very abundant), 

 Ischnura per parva (common), IscJinura cervula, Enallagma cyathigerum, 

 Anax Junius (seen on the wing), OpMogompTius occidentis (on the 

 Columbia beach), Sympetrum corruptum and Libellula forensis. 



The third place I found Argia vivida was on lower Satus Creek. On 

 August 24, 1913, I took 10 specimens around a scum-covered spring- 

 fed side channel of Satus Creek. This small spot agreed with the 

 other two in being a cold spring-fed but stagnant stream. Perhaps 

 these were descendants of strays from farther up the creek. 



Numerous specimens of both sexes from both Logie Creek and 

 Sherman, Oregon, were heavily infested with red mites, in which 

 respect it differs from emma, which I have never found infested. 



This species differs also from emma in that frequently when pursued 

 it will dodge into bushes or other vegetation, where an Argia emma 

 would fly for the open.^ 



The following descriptions of the adults are for comparison with 

 Argia emma. The color notes are from live specimens and alcoholic 

 material. 



DESCRIPTION. 



This is a large and robust species of Argia, sluggish in comparison 

 with emma, and, as its name implies, brilliantly colored. 



Length of abdomen: Male, 26-30 mm.; average, 27.8; female, 24- 

 29 ; average, 27. Fore wings sUghtly longer than hind wings. Length 



I Throughout California and Nevada Argia vivida occurs in all permanent springs, and while imagoes 

 are occasionally caught on streams and ponds such can usually be traced to near-by spring streams. I 

 have taken it from sea level to 6,000 feet altitude (Lake Tahoe). 



81022°— Proc.N.M.vol.49— 15 19 



