Holotype; male; 4729fae3-fe68-4f4b-98e0-3c36cf7ca09e; deposited at: Academy of Natural Sciences of Philadelphia (ANSP); United States: Texas
Oedipoda costalis Scudder, 1862 in Walker, 1870: 732.
Tragocephala costalis (Scudder, 1862) in Stål, 1873: 119.
Encoptolophus parvus Scudder, 1875: 480.
Syntype; male; b2d43a84-202c-42f7-a7a6-5598606b9c3b; deposited at: Academy of Natural Sciences of Philadelphia (ANSP); United States: Texas
Encoptolophus costalis (Scudder, 1862) in Scudder, 1875: 480.
Encoptolophus costalis (Scudder, 1862) in Townsend, 1893: 31.
Encoptolophus parvus Scudder, 1875 in Scudder & Cockerell, 1902: 29.
Encoptolophus costalis (Scudder, 1862) in Scudder & Cockerell, 1902: 29.
Encoptolophus coloradensis Bruner, 1904: 58.
Lectotype; male; d369b0a7-f06a-4f8c-8783-65c3dabad7b6; deposited at: Academy of Natural Sciences of Philadelphia (ANSP); United States: Colorado: Larimer: Fort Collins
Encoptolophus montanus Bruner, 1905: 140.
Lectotype; male; a3462f7b-7543-432e-8d2e-137005dda9a2; deposited at: Academy of Natural Sciences of Philadelphia (ANSP); United States: Montana: Gallatin: Bozeman
Encoptolophus montanus Bruner, 1905 (subjective synonym of Encoptolophus parvus Scudder, 1875) in Caudell, 1908: 74.
Encoptolophus coloradensis Bruner, 1904 in Rehn & Hebard, 1909: 147.
Encoptolophus coloradensis Bruner, 1904 in Rehn & Hebard, 1912: 123.
Encoptolophus montanus Bruner, 1905 in Rehn & Hebard, 1912: 115.
Encoptolophus coloradensis Bruner, 1904 (subjective synonym of Oedipoda costalis Scudder, 1862) in Hebard, 1925: 74.
Encoptolophus montanus Bruner, 1905 (subjective synonym of Oedipoda costalis Scudder, 1862) in Hebard, 1925: 74.
Encoptolophus parvus Scudder, 1875 (subjective synonym of Oedipoda costalis Scudder, 1862) in Hebard, 1925: 74.
Encoptolophus costalis (Scudder, 1862) in Hubbell & Ortenburger, 1926: 166.
Encoptolophus costalis (Scudder, 1862) in Hebard, 1928: 235.
Encoptolophus costalis (Scudder, 1862) in Hebard, 1929: 335.
Encoptolophus sordida costalis (Scudder, 1862) in Hebard, 1935: 287.
Encoptolophus sordida costalis (Scudder, 1862) in Brooks, 1958: 40.
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