Common cicadas of Montana (MT):
Megatibicen dorsatus (Say, 1825) aka Bush Cicada or Grand Western or Giant Grassland Cicada

Okanagana fratercula Davis, 1915
Okanagana gibbera Davis, 1927
Okanagana hesperia (Uhler, 1872)
Okanagana luteobasalis Davis, 1935
Okanagana occidentalis (Walker in Lord, 1866)
Okanagana oregona Davis, 1916
Okanagana striatipes (Haldeman, 1852)
Okanagana synodica synodica (Say, 1825) aka Walking Cicada
Okanagana utahensis Davis, 1919
Platypedia areolata (Uhler, 1861)
Platypedia putnami lutea Davis, 1920 aka Putnam’s Cicada
Platypedia putnami putnami (Uhler, 1877) aka Putnam’s Cicada
Name and Location References:
- Full Binomial Names: ITIS.gov
- Common names & locations: BugGuide.net; iNaturalist.com; The Songs of Insects by Lang Elliott and Wil Herschberger; my personal memory.
- Locations: Biogeography of the Cicadas (Hemiptera: Cicadidae) of North America, North of Mexico by Allen F. Sanborn and Polly K. Phillips.
- List of species with MAPs: Biogeography of the Cicadas (Hemiptera: Cicadidae) of North America, North of Mexico [PDF] by Allen F. Sanborn and Polly K. Phillips. Download it once; treasure it forever.