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Blue dasher
The blue dasher (''Pachydiplax longipennis'') is a dragonfly of the skimmer family. It is common and widely distributed in the United States.
Mature males develop a bluish-white pruinescence on the back of the abdomen and, in western individuals, on the thorax. They display this pruinescence to other males as a threat while defending territories at the edge of the water.
Although the species name ''longipennis'' means "long wings", the wings are not substantially longer than those of related species. Females do, however, have a short abdomen that makes the wings appear longer in comparison.〔 The blue dasher grows up to 25–43 mm long. Juvenile males will show female coloration before they turn blue. Females are paired with yellow stripes on the dorsal side of the first 8 abdominal segments, the part of the body that lies between the thorax and the pelvis and encloses the stomach, intestines, liver, spleen, and pancreas; more commonly known as the belly. Females are also reported to turn blue, but at a slower rate then the males.
==Life cycle==
As the blue dasher ages, the wings will wear and tear. Females will lay eggs in the aquatic vegetation. Their life span is usually a summer and three seasons. From late June to October.
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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