A Taxonomic Revision Of The Afrotropical Species Of The Weevil Genus Cionus (Coleoptera: Curculionidae) Author Caldara, Roberto Author Košťál, Michael 0000-0002-3271-1400 michael.kostal@iol.cz text Zootaxa 2023 2023-05-18 5288 1 1 98 http://dx.doi.org/10.11646/zootaxa.5288.1.1 journal article 53332 10.11646/zootaxa.5288.1.1 1bb291cc-9442-4973-8dd8-9cc79a0a432b 1175-5326 7958875 7ABCE6CB-D92C-4B11-87F2-263B7163EEF2 28. Cionus usambicus Faust ( Figs 28a–b ) Cionus usambicus Faust, 1899: 331 . Type locality . Kwai ( Tanzania ). Type series . This species was described based on a single specimen (according to Faust a male, but actually a female), from Kwai (currently in Tanzania ), which we examined. It is labelled “[small quadrate golden paper] / Kwai, Weise / usambicus Fst. / Coll. J. Faust Ankauf 1900 / Type ” ( SMTD ). Diagnosis . Pronotum with four moderately pronounced protuberances. Elytra short, with prominent humeri, covered with uniformly light brown scales, interstria 3 more convex at base, striae not visible. FIGURES 27–28. FIGURE 27. Cionus terrosus sp. n. a: body in dorsal view (male), b: body in lateral view (male), c: rostrum in lateral view (female), d: penis in ventral view, e: penis in lateral view, f: apex of penis in dorsal view. FIGURE 28. Cionus usambicus . a: body in dorsal view (female), b: body in lateral view (female). Not to scale. Redescription . Female ( holotype ) ( Figs 28a–b ). Body: short, globose (length 3.1 mm ). Head: rostrum stout, moderately long (Rl/Rw 4.80, Rl/Pl 1.50), blackish; in lateral view regularly moderately curved, of same width from base to apex, in dorsal view parallel-sided to antennal insertion, then slightly widened to apex, distinctly striate-punctate from base to apex, covered with moderately dense, subrecumbent to recumbent, elongated (l/w 5–7), grayish and light brown scales. Head between eyes concave, moderately narrow, 0.6× as wide as rostrum at base, with dense, elliptical grayish scales forming comb around apex of eyes. Eyes flat. Antennae reddish with slightly darker club, inserted between middle and apical third; scape long (l/w 8); funicle moderately shorter than scape, S1 more robust than and as long as S2, 1.7× as long as wide, S2 twice as long as wide, S3–5 as long as wide; club oblongly oval, shorter than funicle, pubescent. Pronotum: reddish, with somewhat irregular, very small, indistinct, very shallow punctures, completely hidden by recumbent, dense, partly imbricate, variously oriented, moderately elongated (l/w 5–8), subelliptical, mostly whitish scales, which are brown in middle of basal half; conical, distinctly transverse (Pw/Pl 1.50), widest at base, with rectilinear sides, weakly convex on disc, with four transversely arranged protuberances each emphasized by tufts of erect whitish and light brown scales. Prosternum: anterior margin distinctly emarginated. Scutellar shield: heart shaped, densely covered with grayish and light brown scales. Elytra: reddish, globose, short (El/Ew 1.13), widest at middle, distinctly wider than pronotum (Ew/ Pw 1.87), humeri distinctly prominent, weakly rounded, sides subparallel, somewhat convex on disc; interstriae flat, almost straight except interstria 3 sinuate, more convex at base, with slightly irregular, very small, indistinct, very shallow punctures, completely hidden by recumbent (only a few weakly raised), dense, imbricate, variously oriented light brown scales, base of interstria 3 with two maculae of dark brown scales, without spots; striae not visible, with moderately deep punctures, 1/3 as wide as interstriae, intervals between punctures situated at same level as interstriae. Venter: mesosternal process moderately convex, slightly emarginated. Metasternum 0.7 × as long as V1. Abdomen with somewhat irregular, very small, indistinct, very shallow punctures, feebly visible between elongated, whitish scales being elliptical at sides and longer, hair-like in middle; V1 1.8× as long as V2; V1+2 4.4× as long as V3+4, latter ones as long as V5. Legs: reddish, integument feebly visible between moderately dense, elongated grayish and light brown scales; femora with robust sharp teeth; tibiae without unci; tarsi with onychium as long as T1–3 combined; claws almost equally long. Male. Unknown Variability. We examined only the holotype . Remarks . This species (at least the female) is similar to almost unicolorous specimens of C. ingratus , from which it differs by the distinctly longer and arcuate rostrum, and by tarsomeres, especially the onychium distinctly longer. Biological notes. No data are available. Distribution . Tanzania.