NO.2107. DRAGONFLIEt<, WA.SHIXGTON AND OliEGON— KENNEDY. 339 



Figure 160 shows the extent of the dark color on the wings of the 

 male and figure 161 the extent of that on the wings of the female. 

 The second segment of the male is shown in lateral view in figure 162, 

 the penis in figure 163, and the appendages in figure 164. The nymph, 

 shown in figures 165 and 166, is very similar to that of Agrion macu- 

 latum Beauvois but differs in having a less vivid color pattern. The 

 pattern in life is in various shades of olive green, which dissolves 

 out into the alcohol in which the specimens are placed. 



NympTi (figs. 165-167).— Length, 24 mm.; gills, 16 additional; hind 

 femur, 8.5; abdomen, 16; antenna, 5.5. 



Head fiat and broad. Basal segment of antenna scarcely as long 

 as head is wide, longer than other six segments. Labium (fig. 167) 

 bifid to below bases of lateral lobes. A short mental seta on either 

 side of the cleft. Each lateral lobe with two short setae at base of 

 lateral lobe. Each lateral lo1)e, besides the movable hook, with 

 three end hooks. Abdomen with segments 1-9 with high lateral 

 keels. No lateral spines on abdomen. Wing cases reaching beyond 

 middle of fourth segment. GiUs (see figs. 165 and 166) linear, the lat- 

 eral gills longer than the median and thicker. Color olive, with an 

 obscure broad Hghter stripe on head and thorax. A longitudinal 

 stripe on each lateral abdominal keel and a pale band on each femur, 

 tibia, and gill. 



The nymph of the variety yakima, then, differs from the eastern 

 nymphs of aequahile as described by Needham^ in its greater size 

 and in having only two setae at the base of each lateral lobe, neither 

 being characters of specific importance. 



The female of this species oviposits by inserting the eggs under the 

 water in willow roots. She is unaccompanied by the male but 

 remains indifferent as various males hover over her. 



2. ARCHILESTES CALIFORNICA McLachlan. 



Tliis species is found along the river and creeks from the first week 

 in August until frost. It is most abundant on Satus Creek. 



3. LESTES CONGENER Hagen. 



This is common around the sloughs near Toppenish and Donald, 

 but is most abundant on Satus Creek. It also occurs around Nigger 

 Pond. It is an aU-summer species, but is most abundant on Satus 

 Creek during August and September. 



NympTi (figs. 168-172) . — This is described from a single nymphul skin 

 found among Juncus stems on the banks of a stagnant pool of Satus 

 Creek, September 3, 1914, Lestes congener was abundant at this 

 point and was the only species of Lestes found on Satus Creek, though 

 during the summer I made eleven trips at intervals of a week. A 

 pair of congener were seen ovipositing a short distance from this point. 

 The male was holding the female and she had her abdomen looped 



1 Needham, James G., Macgillivray, Alex. D., Johannsen, O. A., and Davis, K. C. Aquatic Insects 

 in New York State. Bull. 68, N. Y. State Mus., pp. 517, pis. 52, text figs. 26, 1903. See pp. 222, 223-224. 



