An extraordinary new genus and three new species of Acostemmini (Hemiptera: Cicadellidae: Deltocephalinae) from Madagascar with comments on the morphology and classification of the tribe Author Zahniser, J. N. Illinois Natural History Survey Prairie Research Institute University of Illinois at Urbana / Champaign 1816 S. Oak St. Champaign, IL 61820 USA. E-mail: zahniser @ illinois. edu zahniser@illinois.edu Author Nielson, M. W. Affiliate Faculty, Monte L. Bean Museum Brigham Young University Provo, UT 84602 USA. E-mail: mwnielz @ gmail. com Corresponding author. E-mail: zahniser @ illinois. edu text Zootaxa 2012 2012-02-28 3209 1 28 52 https://biotaxa.org/Zootaxa/article/view/zootaxa.3209.1.2 journal article 10.11646/zootaxa.3209.1.2 1175-5326 5248266 Alocoelidia chasei sp.n. ( Figs. 32–40 ) Description. Length of male 5.8–5.9 mm. Color ochraceous to brownish with dark brown or black markings. Forewing apex smoky or black, dark coloration occupying apical 1/2 of 3 rd apical cell and adjacent areas (Figs. 32,33). Externally very similar to the preceding species with the following differences: slightly larger, general color darker, tending toward more brownish or dark coloring than ochraceous. Male. Pygofer sclerotized dorsally to about midlength; somewhat elongate; excavated ventrally; gradually tapered to apex; with pair of very short medially curved spines on dorsal margin next to segment X (Figs 38,39). Valve fused to subgenital plates medially, with line of articulation with plates evident laterally; with long length of articulation with pygofer ( Fig. 40 ). Subgenital plates fused basally, separate and diverging in apical half; without macrosetae; relatively slender; lobate; incised laterally ( Fig. 40 ). Style with basal part and apophysis distinct from each other; apex of basal part with knob-like process directed dorsally, denticulate; apophysis strongly recurved, broad at base, attenuating to long, sharp apex ( Fig. 37 ). Aedeagus with two broad shafts diverging laterally from posterior part of broad base; with pair of recurved processes arising above shafts, directed anteriorly; gonopores large, subapical ( Figs. 34–36 ). Segment X sclerotized dorsally to base; sclerotized laterally, forming narrow collar ventroapically (Figs. 38,39). Material examined. Holotype ♂ ( CAS ): MADAGASCAR : Province Fianarantsoa , Parc National Ranomafana , radio tower at forest edge, elev 1130 m , 21°15.05’ S 47°24.43’ E , collector: R . Harin’Hala , California Acad. of Sciences , malaise, mixed tropical forest, MA-02-09B-140. Etymology. This species is named in honor the first author’s nephew, Chase K. Wiggers.