NO.2107. DRAGONFLIES, WASHINGTON AND OREGON— KENNEDY. 311 



Fterostigma of fore wings black, of hind wings dusky, those of hind 

 wings much smaller. 



Abdominal segment 1 pale green, with triangular black spot and a 

 black apical line extending down either side; segment 2 greenish 

 with dorsum broadly black and a black apical line as in segment 1 ; 

 segments 3-7 black above, lemon yellow on sides and ventral surface ; 

 segments 8 and 9 pale blue, with a rectangular black spot on either 

 side; segment 10 with dorsal half black and ventral half yellow. 



In the teneral male the colors on emergence are steel gray with 

 the above described markings. 



Female (figs. 83-86, 105, 110-116). — The females of perparva do 

 not possess two color forms in the mature imago. The mature 

 colors are an obscure smoky green with black markings, which is 

 usually very heavily overlaid with a gray pruinose. 



The teneral colors (figs. 83, 84, 110-114) are orange and black, 

 and in detail are as follows : 



Labrum pale greenish orange, with a minute black triangle on its 

 dorsal edge. Frons orange on its vertical surface and black on the 

 horizontal surface. Vertex orange between the antennae, the 

 remainder black, except large connected orange postocular spots. 

 Eyes dark green above, pale below. Antennae black. Under parts 

 of head pale yellowish. 



Pro thorax orange, paler on lateral and ventral surfaces. Anterior 

 lobe with anterior edge black; middle lobe black, with a small orange 

 area on each side; posterior lobe orange. Coxae, trochanters, and 

 femora pale orange and without markings. Tibiae yellow, with a 

 narrow black stripe on outer side. Tai"si green. 



Mesothorax and metathorax orange, paler below, with a broad 

 black dorsal stripe. On either side a black humeral stripe, nari'ower 

 across the dorsal edge of the mesinfraepisternum. Legs colored as 

 are first pair. Wings colorless, pterostigmas clear, yellowish. 



Abdomen orange, marked with black as follows: Segment 1 with 

 two minute spots on dorsal surface; segment 2 with minute cross hne 

 on dorsal sm*face and a naiTOw apical ring; segment 3 with a spade- 

 shaped marking on apical one-fourth of dorsal surface, and an apical 

 ring; segments 4 to 7 with dorsal surface black, except narrow basal 

 ring, and on segment 7 a narrow apical ring; segment 8 with a large 

 U spot, the U opening caudad; segment 9 with small anterior spot 

 on either side; segment 10 orange. 



The teneral on emerging is a pale flesh color with the dark markings 

 just described indicated by gray. Within an hour or two the orange 

 and black coloration has been assumed. Figure 114 shows the usual 

 color pattern on the abdomen of a teneral female perparva. Figures 

 1 1 to 1 13 are less common forms. Figure 115 shows a female colored 



