species

Lapsium difficile (Van Duzee, 1912)

Oliarus difficilis Van Duzee, 1912a: 494.
Holotype; female; e7e038d1-aca6-4665-870b-f03d4f7eaec1; deposited at: American Museum of Natural History (AMNH); U.S.A., Florida: Belleair, collection of Mrs. A.T. Slosson
Oliarus vittatus Metcalf, 1923a: 181.
Holotype; male; 19b7417d-e3c6-4133-ae87-961d1d8ad444; deposited at: Illinois Natural History Survey (INHS); U.S.A.: Brownsville, Texas, November 19, 1911
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Gender, form, and etymology

Etymology:

Latin: difficult, troublesome

Hendrix, S.V. & Bartlett, C.R. (2025) Reclassification of the planthopper genus Melanoliarus Fennah, 1945 (Hemiptera: Fulgoromorpha: Cixiidae), primarily north of Mexico, with notes on American Pentastirini. Zootaxa, 5619(1), 1–87. https://doi.org/10.11646/zootaxa.5619.1.1
Mead, F.W. & Kramer, J.P. (1982a) Taxonomic study of the planthopper genus Oliarus in the United States (Homoptera: Fulgoroidea: Cixiidae). Transactions of the American Entomological Society, 107, 381–569. [1981]

Metcalf, Z.P. (1923a) A key to the Fulgoridae of Eastern North America with descriptions of new species. Journal of the Elisha Mitchell Scientific Society, 38(3-4), 139–230.
Van Duzee, E.P. (1912a) Hemipterological gleanings. Bulletin of the Buffalo Society of Natural Sciences. Buffalo, N. y, 10, 477–512.

	Valid names
Rank	Extant	Fossil	Invalid	Total
species	1	0	3	4