Chelobasis laevicollis ( Waterhouse 1879 )

Staines, C. L., 2009, A review of the genus Chelobasis Gray, 1832 (Coleoptera: Chrysomelidae: Cassidinae), Zootaxa 2033 (1), pp. 58-68 : 64

Chelobasis laevicollis ( Waterhouse 1879)

( Figures 3 , 7 )

Arescus laevicollis Waterhouse 1879: 427 (Holotype: Colombia, Medellin, BMNH). Donckier 1899: 569 (catalog).

Chelobasis laevicollis (Waterhouse) . Weise 1911a: 12 (catalog), 1911b: 17 (catalog); Blackwelder 1946: 721 (faunal list); Papp 1953: 29 (catalog); Uhmann 1957: 33 (catalog).

Arescus waterhousei Duvivier 1885: 249 (type: Amazonas, Cauca, NMNH?). Weise 1911a: 12 (synonymy), 1911b: 17 (synonymy); Papp 1953: 29 (catalog).

Yellow; antennae and scutellum black; head either yellow or black; elytra with black spots; tibiae and tarsi black apically; oblong; convex. Head: medial sulcus present; vertex smooth; frontal horn quadrate, broad, truncate at apex; frons smooth, not projecting; eyes large, convex. Antenna: cylindrical; reaching to base of pronotum; antennomere 1 short, obconical, with apical projection as long as 2; 2 small, transverse; 3 as long as 1 and 2 combined; 4–11 short; 8–11 thicker than preceding. Pronotum: weakly transverse; slightly convex; lateral margin sinuate at base, then straight and parallel until apical ¾, then angulate and sinuate to apex; anterior angle with rounded tooth; posterior angle with long acute tooth; flattened, impunctate; pronotal length 2.6 mm (n=1); pronotal width 3.4 mm. Scutellum: elongate; triangular; micropunctate. Elytron: slightly expanding to apex; lateral and apical margins smooth; sutural angle slightly emarginate convex; 10 rows of lightly impressed punctures plus short scutellar row; humerus rounded, slightly produced; elytral length 8.7 mm; elytral width 4.4 mm. Leg: apex of tibia with small tooth. Total length: 12.4 mm.

Larva. Unknown.

Larval host plant. Unknown.

Comparative notes. This species can be distinguished by the angulate elytral apices, by antennomere 3 being subequal in length to 1 and 2 combined, and by antennomere 2 being transverse.

Distribution. Colombia.

Specimens examined. Colombia. Magdalena: Medellin ( BMNH). Total: 1 .

Figures

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.

FIGURES 5–8. Elytral apices and antennae of Chelobasis species. 5a. Elytral apex of Ch. aemula. 5b. Antennae of Ch. aemula. 6a. Elytral apex of Ch. bicolor. 6b. Antennae of Ch. bicolor. 7. Elytral apex of Ch. laevicollis. 8a. Elytral apex of Ch. perplexa. 8b. Antennae of Ch. perplexa.