NO. 2107. DRAG0NFLIE8, WASHINGTON AND OREGON— KENNEDY. 335 



of the lateral lobe and a single seta on the inner face of the base of the 

 lateral lobe. The eyes are relatively large, occupying two-fifths of 

 the width of the head. Segments 6-9 have a well-defined spine on 

 each side at the posterior end of the lateral keel. Segment 5 has 

 usually a pair of small spines. Segments 1-4 are without spines. 



The gills (see fig. 173) are slightly asymmetrically lanceolate, with 

 rounded tips. The middle gill is wider than the lateral gills and 

 curves downward. The lateral gills curve upward. 



In Ufe the larvae (figs, 173 and 174) were dusky ohve green. The 

 legs show a slight band around the end of the femur. There is a pale 

 stripe along each side of the abdomen. In some specimens there is a 

 narrow middorsal white stripe, in others a row of faint darker spots 

 along the sides. The giUs are uniformly dark, a few specimens 

 showing slightly darker spots on the edges of the lateral gills. 



Figures 173 and 174 show dorsal and lateral views of the nymph, 

 and figures 175 and 176 show details. 



3. ENALLAGMA CYAXmGERUM (Charpentier). 



This species occurred in the sedges along the river bank, but was 

 nowhere abundant. 



4. COENAGRION RESOLUTUM (Hagen). 



This species (figs. 177-184) was very abundant in the sedges and 

 patches of Equisetum bordering the river itself. I found many 

 females, evidently in a teneral stage, but only two exuviae. The 

 teneral females had the sides of the thorax and femora pink. In the 

 male the blue humeral stripes in about one-fourth of the specimens 

 were interrupted as is shown in figure 183. As I can find no figures of 

 the anatomical details of this species I have figured various parts 

 (see figs. 177-181). The mesostigmal lamina of the female (fig. 181) 

 is especially large and well developed. 



Because I found only two exuviae and but few very young tenerals, 

 I believe that aU individuals of this species, at least in this locality, 

 must emerge at about the same time and that this general emergence 

 had been previous to my arrival. Of the exuviae one was taken by 

 itself a few inches above the surface of the water, the other was found 

 on a stem of Carex, on the top of which rested a teneral female. The 

 only other species found in the meadows with whose exuviae they 

 might be confused were Ischimra perparva, Ischnura cervula, and 

 Enallagma cyatTiigerum. They are not the exuviae of any of these 

 species. 



Nymph (figs. 185-189). — Length (excluding gills), 15 mm.; gills, 8 

 extra; abdomen, 8; hind femur, 3. 



The nymph (figs. 185 and 186) is slender, between those of Argia and 

 Enallagma in slenderness. The head (see fig. 186) is broad, very flat 

 on the dorsal surface, and very slightly emarginate behind. The 

 antennae are one-fourth longer than the head. The labium (fig. 189) 



