Greater Anglewing, (Microcentrum rhombifolium).

Appropriately named, the greater anglewing has curiously rhombus-shaped wingcovers. These clicking insects emerge a few weeks after the common true katydids and add a strange stone-tapping sound to the grinding chorus of other night singers. 

Thank you to Wil Hershberger for letting us use the insect calls from SongsofInsects.com. 

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Sources and more: 

• http://songsofinsects.com/katydids/greater-anglewing 
• https://bugguide.net/node/view/6891 
• Guide to night singing insects of the northeast by John Himmelman