species

Lapsium difficile (Van Duzee, 1912)

Descendants and synonyms

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.

Summary of taxonomic names by rank, showing valid extant names, fossil names, invalid names, and total counts.
Taxon	Valid names
Rank	Extant	Fossil	Invalid	Total
species	1	0	3	4