NO. 2107. DRAGONFLIES, WASHINGTON AND OREGON— KENNEDY. 269 



are as follows: The abdomen (see j&g. 26) below the lateral keel is 

 uniformly pale. Above each lateral keel is a narrow white stripe, 

 jogged at the end of each segment as is the lateral keel. There is a 

 small black apical spot on the side of each segment just above the 

 lateral white line. Above each black spot is a white spot. The 

 remainder of the dorsum of the abdomen is uniformly dark except a 

 narrow middorsal stripe. Gills (sec fig. 22) with outer two-fifths 

 dark and a narrower band across the second fifth from the base. 

 Legs (see fig. 23) with two narrow dark bands at apex of femur. 



Thus the Satus specimens, as pointed out before, in being an 

 isolated brood of Archilestes and perhaps the northernmost outpost 

 of this southern genus, show a racial integrity in the following points : 

 (1) Small size of nymphs and imagoes ; (2) lack of metallic coloration; 

 (3) shape of male appendages, and (4) coloration of nymphs.^ 



2. A NEW SPECIES OF DRAGONFLY OF THE GENUS ARGIA, ITS LARVA 

 AND THE LARVA OF ARGIA VIVIDA. 



On July 31, 1910, while collecting along the Yakhna River near 

 the Mabton Bridge, I took for the firat time several pail's of a large 

 Argia, the males of which were of a rich violet color. At this point 

 the river was shallow, muddy bottomed, and stagnant. The Argias, 

 in company with Enallagma cyathigerum, Ischnura perparva, and 

 Ischnura cefvula, were flying about and resting on a small patch of 

 Potamogeton. I tried at first scooping them with my net in order 

 to keep the net dry, but failed. Success came only when they were 

 slapped into the water, potamogeton, net, and Argia. My fii-st meet- 

 ing with them showed that they were quick, nervous, and unusually 

 wary. 



I saw no others until August 13, 1911, when I found them very 

 abundant on the gravelly beaches and stony rifiles of lower Satus 

 Creek. It was soon evident that on gravelly ground it was practi- 

 cally impossible to catch them, as the uneven surface of the gravel 

 permitted them to dodge under the edge of the net. Durmg the two 

 hours I had at my disposal for collecting, I succeeded in taking less 

 than a dozen specimens, though they were very abundant. 



None were collected duiing 1912, but duiing the past summer 

 (1913) I managed to carry out an extended campaign of collecting 

 on Satus Creek, making 11 trips, though the creek is 18 miles fi'om 

 the ranch. 



Satus Creek drains that part of the Yakima Valley which lies be- 

 tween the Simcoe Mountains and the brown, barren Hoi-se Heaven 



' Just recently in San Jose and at Napa, California, I Lave had opportunity to observe the live ArcMlestes 

 nymphs. They are very free swimmers, and on being disturbed swim into the open water like a school 

 of minnows, which I thought they were when I first saw them. This habit accounts for my failiu-e to 

 capture any by raking. Emergence had just begun at Napa on June 9. Here the nymphs were very 

 abundant in the ponds on the State Hospital grounds. 



