http://www.iucnredlist.org/apps/redlist/details/15129/0 - Endangered status information
A female Oecanthus laricis was found about 12 feet up in a Tamarack tree in the Oak Grove State Game Area - NW of Detroit. She has deep brownish black head, pronotum and abdomen -- whereas Oecanthus pini would have brownish red in these areas.
Description by Thomas J. Walker.
The video below shows a pair of Tamarack tree crickets. When a male raises his wings to sing, the metanotal gland becomes visible.