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The chalk-fronted corporal (''Ladona julia'') is a skimmer dragonfly found in the northern United States and southern Canada. Juveniles of both sexes are light reddish brown, with white shoulder stripes and a black stripe down the middle of the abdomen. As they mature, males develop a white pruinescence on the top of the thorax and at the base of the abdomen, while the rest of the abdomen turns black. Females become almost uniformly dark brown, with a dusting of gray pruinescence near the base of the abdomen; a few develop the same color pattern as the males. Chalk-fronted corporals often perch horizontally on the ground or on floating objects in the water, flying up to take prey from the air. They are gregarious for dragonflies, and are commonly seen perching in groups. They readily approach humans to feed on the mosquitoes and biting flies that humans attract. ==Gallery== Ladona julia on stone 183504861.jpg|Males Chalk-fronted Corporal, female juvenile, Magnetawan River.jpg|Female juvenile Chalk-fronted Corporal, female juvenile, side-view, Magnetawan River.jpg|Female juvenile Libelle_7_db.jpg|Female Chalk-fronted_Corporal_(Ladona_julia)_-_Male_01.jpg|Male 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chalk-fronted corporal」の詳細全文を読む スポンサード リンク
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