Cyrtolobus fenestratus is a species of treehopper belonging to the family Membracidae.

[1] It was first described by Dr. Asa Fitch in 1851.

C. fenestratus is found in eastern United States stretching to Colorado and southern Canada.

[2] This Hemiptera article related to members of the insect suborder Auchenorrhyncha is a stub.

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