NO.2107. DRAGONFLIES, WASHINGTON AND OREOON— KENNEDY. 313 



nymphs are easily confused with the more lightly pigmented cervida 

 nymphs. However, in the exuviae, while the legs frequently show 

 indistinct bands, the edges of these fade out, giving a lack of sharp 

 definition as occurs in cervula, even in the pale cervula exuviae. As 

 shown by the figures 124-126, the labial setae are not a reliable diag- 

 nostic character. 



4. NOTES ON MACROMIA MAGNIFICA AND ITS NYMPH. 



While collecting on Satus Creek, Yakima County, Washington, 

 July 27, 1913, I became suspicious of my determination of certain 

 very swift dragonflies which I had been unable to net, but which I had 

 hitherto thought were Aeshna multicolor. To satisfy myself I re- 

 turned August 3 with a shotgun, a few shots from which showed these 

 swift fliers to be Macromias, which on later examination proved to 

 be Macromia magnifica (figs. 133-145). After using 25 shells loaded 

 with No. 10 shot I hit nine Macromias, five of which were still usable 

 as specimens. 



On August 7 I returned with Professor Farr, of Sunnyside, and 

 during two days of strenuous effort we netted three Macromias. 

 With the use of the gun and a second box of shells we procured tlu*ee 

 more specimens. On this trip we searched for nymphs and exuviae, 

 but found none. 



On August 24 I returned alone and netted a single specimen, the 

 same day finding five exuviae in an alder tree. These were from 2 to 

 10 feet above the surface of the creek in a tree, under whose roots the 

 creek had cut, forming a pool about 3 feet deep, which was half filled 

 with the fibrous alder roots. One exuvia was fastened with out- 

 spread legs close to the trunk of the tree, but the other four nymplis 

 had crawled up and out on limbs and finally onto twigs less than the 

 size of a straw, from which the skins were hanging back downward. 

 As these were found late in the day I did not search further, but re- 

 turned on September 7. This time in an alder tree similarly situated 

 were found six more exuviae, while in the mass of roots in the pool 

 beneath the tree was found a live nymph of the 1914 brood. A short 

 distance from this in a third alder tree overhanging an undercut bank 

 were found three more exuviae. Probably Macromias had emerged 

 from other tree-fringed pools but these three trees were the only ones 

 so situated that they were well enough protected from the wind to 

 prevent the blowing down of the exuviae, as these must have been 

 hanging, when found, not less than six weeks. 



As contrasted with the restless activity of the adults the move- 

 ments of the nymph were extremely deliberate. In fact, he betrayed 

 his presence in the tree roots thrown out onto the bank, not by his 

 movements but by a slight chirping noise made in expelling air 

 from the cloacal chamber. 



