Oxychalepus bisignatus ( Chapuis 1877 )

Staines, C. L., 2010, A review of the genus Oxychalepus Uhmann, 1937 (Coleoptera: Chrysomelidae: Cassidinae), Zootaxa 2573 (1), pp. 35-56 : 43-44

Oxychalepus bisignatus ( Chapuis 1877)

( Figure 5 )

Odontota bisignatus Chapuis 1877: 13 [Syntype: Argentina, Buenos Aires (INSB)]. Uhmann 1965: 254 (types).

Chalepus bisignatus (Chapuis) . Donckier 1899: 586 (catalog); Blackwelder 1946: 726 (faunal list).

Xenochalepus bisignatus (Chapuis) . Weise 1911a: 47 (redescription).

Chalepus (Xenochalepus) bisignatus (Chapuis) . Weise 1911b: 26 (catalog), 1911c: 39 (catalog); Bruch 1915: 377 (faunal list), 1928: 203 (faunal list); Papp 1953: 77 (catalog).

Oxychalepus bisignatus (Chapuis) . Monrós & Viana 1947: 247 ( Argentina species); Uhmann 1957a: 108 (catalog); Ramos 1998: 306 ( Brazil species).

Xenochalepus geometrica Weise 1910: 140 [type: Brazil, Goyaz , depository unknown].

Chalepus (Xenochalepus) bisignatus geometrica Weise. Weise 1911a: 47 (comparison), 1911b: 26 (catalog), 1911c: 39 (catalog); Bruch 1915: 376 (faunal list).

Chalepus bisignatus geometrica Weise. Blackwelder 1946: 726 (faunal list).

Description. Oblong, subopaque; head, scutellum, and legs black; pronotum with spot on anterior margin and a reddish triangular macula on each side; elytra black, with two transverse yellow bands, one basal and another postmedial, united by a discal band; venter black. Head: vertex of the head with transverse depression behind eyes; vertex trisulcate, medial sulcus faint; clypeus subquadrate, with confluent tubercles; frons punctate, not projecting. Antenna: antennomeres 1 and 2 thick, transverse, subequal in length and width; 3–5 cylindrical, subequal in length, sulcate; 6–10 transverse; 11 pointed at apex; 1–4 glabrous; 5–11 with gray setae. Pronotum: obconic; lateral margin straight, sinuate at base and apex; anterior angle with rounded tooth; surface sparsely, irregularly punctate, slightly canaliculate; medial transverse basal impression distinct; with distinct microsculpture between punctures; slightly narrower than elytra; at base twice as wide as long; pronotal length 0.9–1.0 mm (n=21); pronotal width 1.7–2.0 mm. Scutellum: subcordate; alutaceous. Elytron: lateral and apical margins densely denticulate; apical margin with 3–4 large frequently curved teeth; with 10 rows of punctures, scutellar row absent; intervals 2, 4, and 8 costate; costae 1 and 2 unite on apical ¼; 3 visible at base; 4 complete, weak; apical angle subemarginate; elytral length 5.3–5.9 mm; elytral width 2.4– 2.6 mm. Venter: prosternum smooth; meso- and metasterna smooth medially, punctate laterally. Leg: femur and tibia punctate; metatibia of male without tooth. Length: 6.0– 8.6 mm.

Remarks. This species can be distinguished by the elytra without a scutellar row; with the vertex of the head being trisulcate; by antennomeres 1–2 being transverse; and by the lateral margin of the pronotum being sinuate at base and apex while straight in the middle.

Host plant. Unknown.

Distribution. Argentina, Brazil, and Ecuador.

Specimens examined. No label data ( USNM, DEI) . Argentina. Buenos Aires: Buenos Aires ( INSB) . Misiones ( USNM) . Bolivia. Santa Cruz: Santa Cruz, 28.xi.1972 ( USUC) . Brazil. no label data ( DEI) . Goyaz: Campinas , i.1938, ii-iii-1938 ( DEI) ; Jatahy ( USNM, DEI) ; Susuapara ( USNM) ; S. José de Tocantins, Rio São João , 22.vi.1942 ( USNM) . Minas Gerais: nr. Timoteo , 1–15.vi.1999, 30.x.1999 ( USUC) . Rondonia: 62 km SE Ariquemes , 15–22.iii.1991, 13–25.iv.1992 ( USUC) , 11–22.xi.1991 ( UNLC) . Ecuador. Pichincha: Tinalandia, nr. St. Domingo , vii.1983 ( USUC) . Total: 21.

Figures

FIGURES 5–8. Habitus of Oxychalepus species. 5. Oxychalepus bisignatus. 6. Oxychalepus centralis. 7. Oxychalepus elongatus. 8. Oxychalepus externus.