Haplaxius Fowler 1904

Bahder, Brian W., Barrantes Barrantes, Edwin A., Zumbado Echavarria, Co. A., Mou, De-Fen, Helmick, Ericka E. & Bartlett, Charles R., 2020, A new species of planthopper in the genus Haplaxius (Hemiptera: Auchenorrhyncha: Fulgoroidea: Cixiidae) on palms in Costa Rica and a new country record for Haplaxius skarphion, Zootaxa 4767 (4), pp. 543-552 : 546

Genus Haplaxius Fowler 1904

Type species: Haplaxius laevis Fowler 1904

Amended diagnosis. (Modified from Kramer 1979) Small to average size cixiids (3.2-6.4 mm); head in dorsal view narrower than pronotum, eyes large; vertex elongate, moderately broad (among Oecleini ), disc slightly concave, sides and apex carinate, lacking carina at midline and between eyes, apex variably produced beyond eyes. In lateral view, apex of head bluntly angled, ocellus beneath eye (anterior to antenna). In facial view, sides of frons concave (“flared”) and carinate, midline of frons carinate, interrupted near frontoclypeal suture by ocellus, clypeus subtriangular with lateral margins and midline carinate. Antennal scape reduced, pedicel robust, flagellum beadlike basally and filamentous distally.

Pronotum narrow, with irregular ridges and distinct paranotal region, length shortest on midline, posterior margin indented. Tegulae evident. Mesonotum tricarinate; longitudinal midlength of mesonotum about 2x or less that of vertex. Hind tibiae without lateral spines. Forewings tectiform, usually hyaline or transparent, but sometimes infuscated or patterned, veins usually with small setae-bearing pustules.

Male pygofer usually longest on ventral margin, hind margin variably produced. Aedeagus asymmetrical and elaborated with projections and processes, vertical connective articulating base of aedeagus with gonostyli. Gonostyli symmetrical and usually simple. Anal tube symmetrical or asymmetrical, with processes from one or both ventral margins and sometimes with projections originating between ventral margins.