A review of the genus Chelobasis Gray, 1832 (Coleoptera: Chrysomelidae: Cassidinae) Author Staines, C. L. text Zootaxa 2009 2009-03-11 2033 1 58 68 https://biotaxa.org/Zootaxa/article/view/zootaxa.2033.1.6 journal article 10.11646/zootaxa.2033.1.6 1175-5326 5322032 Chelobasis aemula ( Waterhouse 1881 ) ( Figures 1 , 5 ) Arescus aemula Waterhouse 1881: 266 ( Holotype : Ecuador , BMNH). Donckier 1899: 568 (catalog). Chelobasis aemula (Waterhouse) . Weise 1911a: 12 (catalog), 1911b: 17 (catalog); Blackwelder 1946: 721 (faunal list); Papp 1953: 29 (catalog); Uhmann 1957: 33 (catalog). Yellow; antennae, scutellum, and apex of tibiae and tarsi black; elytra with dark blue spots. Head: smooth; slight medial sulcus between eyes; frontal horn quadrate, broad; frons not projecting, with a few punctures. Antenna: extends to humerus; antennomere 1 elongate, apical projection as long as 2; 2 cylindrical, short; 3 cylindrical, elongate, longer than 1; 4–10 decreasing in length; 4 less than ½ length of 3; 11 pointed at apex; 1–4 alutaceous; 5–8 with scattered setae; 9–11 setose. Pronotum: longer than wide; lateral margin straight and divergent for basal ½, then expanding and rounded, then sharply angulate and convergent to apex; anterior angle angulate; posterior angle with large acute tooth; flat with scattered punctures; pronotal length 1.7–1.8 mm (n=8); pronotal width 2.9–3.0 mm. Scutellum: triangular; micropunctate. Elytron: expanding to exterior apical angle, then rounded to apex; lateral and apical margins smooth; sutural angle conjointly rounded; 10 rows of lightly impressed punctures plus short scutellar row; humerus rounded; elytral length 9.1–10.0 mm; elytral width 4.3–4.4 mm . Leg: tibia expanded to apex. Total length: 11.6–13.0 mm. Larva. Unknown. FIGURES 1–4. Habitus of Chelobasis species. 1 . Ch. aemula . 2. Color variation in Ch. bicolor . 3. Ch. laevicollis . 4. Color variation in Ch. perplexa . Larval host plant. Unknown. Comparative notes. This species can be easily distinguished by the rounded elytral apices, the angulate lateral margin of the pronotum, and by antennomere 2 being transverse. Distribution. Ecuador . Specimens examined. Ecuador . Carchi : Gabriel , 750 m , 12.x.1970 ( BPBM ) . Napo : Sarayacu ( BMNH ) . Pinchincha : Estacion Orongo Palmitopomba , 23.vii.2001 ( USNM ) . Total: 8.