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Ischnura erratica
''Ischnura erratica'', the swift forktail, is a species of damselfly in the family Coenagrionidae. It is native to the Pacific Northwest, ranging from British Columbia to northern California.
==Description==
''Ischnura erratica'' is a robust species with a length of and a wingspan of . In the male, the head is black with a green facial stripe and three blue spots on the forehead. The lower part of the eyes are green. The thorax is black dorsally and yellowish-green ventrally, with two lateral blue stripes. The abdomen is shiny black above and yellowish-green or yellowish-orange below. Segments 1 and 2 have blue bands dorsally, segments 3 to 6 have narrow yellow rings and there is a large blue dorsal patch stretching from segments 7 or 8 to segment 10. The tip of segment 10 is extended into an upward-pointing forked tail. The female has two colour phases. One is similar to the male but with duller eyes and greenish-blue replacing blue. The other has pale patches on the head, a greenish thorax, and a black abdomen with narrow green rings at the base of some segments. Immature females have dull orange patches on head and thorax.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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