Abstract
Somatochlora hineana Williamson is among the most endangered Odonata in the United States. Populations of S. hineana were discovered in Illinois (1988) and Wisconsin (1989), and status surveys were conducted there 1990–1993. Adults were observed 30 May–8 September in Illinois and 27 June–23 August in Wisconsin. S. hineana habitat can be characterized as shallow, calcareous, spring-fed marshes or the marshy margins of small, sluggish, calcareous streams. Notes are presented on feeding behavior, male territorial patrols, copulatory behavior, and oviposition. The previously unknown nymph was discovered. The holotype and allotype of S. hineana were compared with specimens from Illinois, Ohio, and Wisconsin. No consistent morphological differences were noted.
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