Dorcasta crassicornis Pascoe 1858
Creators: name: Bezark, Larry G.
name: Santos-Silva, Antonio
name: Nascimento, Francisco E. De L.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerambycidae
Dorcasta
Dorcasta crassicornis

description: Dorcasta crassicornis Pascoe, 1858
(Figs 18–23, 35–37)
Dorcasta crassicornis Pascoe, 1858: 264.
Redescription. Integument mostly black; mouthparts reddish-brown.
Head. Frons moderately finely and abundantly punctate; pubescence nearly obscuring integument, yellowish- white except yellow lateral area, from base of antennal tubercles to apex of genae; with a few long, erect dark setae, without short, thick, slender scale-like setae. Antennal tubercles with yellowish-brown pubescence not obscuring integument. Dorsal surface moderately finely and abundantly punctate (sometimes somewhat coarsely punctate); with wide, slightly oblique yellow pubescent band from behind upper eye lobes to prothoracic margin, usually not prolonged along margin of upper eye lobes toward antennal tubercles; central area sometimes with yellowish-white pubescence not forming band; remaining surface with yellowish-brown pubescence typically not obscuring integument (occasionally, partially obscuring it); with a few long, dark erect setae. Area behind lower eye lobes moderately coarsely, abundantly punctate, gradually sparser toward gena; with oblique, wide yellow pubescent band from eye to prothoracic margin, not connected with band behind upper eye lobe; remaining surface with yellowish-brown pubescence not obscuring integument, especially toward gena. Gena moderately coarsely, sparsely punctate toward ventral side, finer, sparser toward dorsal side; with yellowish-brown pubescence partially obscuring integument, except yellow pubescent band starting on frons; with a few long, dark erect setae. Distance between upper eye lobes 0.3 times length of scape; in frontal view, distance between lower eye lobes 0.7 times length of scape. Antennae in both sexes from almost reaching to slightly surpassing elytral apex. Scape and pedicel with sparse long, dark erect, setae ventrally (setae as long as to longer than diameter of segment, slightly denser on pedicel). Antennomeres III–X with long (from about as long as diameter of antennal segment to almost 3 times), dark erect, setae ventrally, usually sparser on X, notably dense on III–IX. Antennal formula (ratio) based on length of antennomere III (male/female; only one couple measured): scape = 1.20/1.17; pedicel = 0.24/0.32; IV = 1.20/ 1.17; V = 1.00/1.03; VI = 0.80/0.88; VII = 0.71/0.76; VIII = 0.64/0.67; IX = 0.53/0.65; X = 0.49/0.59; XI = 0.58/ 0.70.
Thorax. Prothorax cylindrical, slightly or not narrowed basally, slightly or not narrowed toward distal margin, usually not widened centrally. Pronotum coarsely, abundantly punctate; with wide, longitudinal yellow pubescent band on each side, from base to apex, and narrow, longitudinal yellow pubescent band centrally from base to apex; remaining surface with yellowish-brown pubescence not obscuring integument; with sparse long, dark erect, setae throughout. Sides of prothorax with wide, longitudinal yellow pubescent band close to ventral side, with whitish pubescence on remaining surface not obscuring integument with sparse long, dark erect, setae interspersed. Ventral side of thorax with whitish pubescence not obscuring integument, except laterally wider (especially on mesanepisternum and mesepimeron), longitudinal yellow pubescent band, from mesanepisternum to apex of metaventrite (often also covering basal third of metanepisternum, but more pale yellow). Metaventrite coarsely, sparsely punctate laterally. Scutellum with yellow pubescence obscuring integument. Elytra. Coarsely, moderately abundantly punctate on basal half, gradually finer, sparser toward apex (especially on distal quarter); apex with long, thick spine at outer angle, slightly concave toward short sutural projection; with moderately abundant long, dark erect, setae throughout; pubescence as follows: three longitudinal yellow pubescent bands fused at apex, two dorsally (innermost starting at about apex of basal sixth; outermost from base to apex; both distinctly separate until near apex, but sometimes partially or entirely fused), another laterally, from humerus to apex; three longitudinal white pubescent bands, one between dorsal yellow bands (often absent), one close to lateral curvature, another close to lateral margin; one narrow, yellow or white pubescent band, from scutellum to about apex of basal fourth (sometimes indistinct); remaining surface with yellowish-brown pubescence not obscuring integument. Legs. Metafemora noticeably widened in male (Figs 19, 22), moderately narrow in female (Fig. 23).
Abdomen. Ventrites moderately finely, sparsely punctate, slightly more abundant laterally; with whitish pubescence partially obscuring integument, except longitudinal yellow pubescent band laterally, from base of ventrite I to apex of IV, from slightly to distinctly connected along apex of each ventrite (Fig. 19); ventrite V not distally depressed in female.
Dimensions (mm), male/ female. Total length, 6.60–10.10/8.00–9.95; prothoracic length, 1.30–1.85/1.50– 1.90; basal prothoracic width, 1.00–1.65/1.15–1.50; distal prothoracic width, 0.95–1.50/1.20–1.55; greatest prothoracic width, 1.05–1.70/1.25–1.60; humeral width, 1.25–2.05/1.55–2.00; elytral length, 4.65–7.15/5.60–6.75.
Material examined. MEXICO (new country records), Oaxaca: 19 miles S Matías Romero, 1 male, 25.VI.1969, D. E. Bright col. (MZSP); vic El Aguacero, Tropical deciduous forest, 19 & 24.VI.2016, J. Rifkind & E. Martinez collectors, 1 male. Chiapas: El Aguacero National Park, 1 female, 25.IX.1989, R. L. Penrose col. (LGBC). Quintana Roo: Nuevo X-Can, 1 male, 27.V.1992, R. L. Penrose col. (CSCA); 3 km NW Macario Gomez, 1 male, 4.VI.1992, R. L. Penrose col. (CSCA); Sumidero, 1 female, 23.IX.1989, F. T. Hovore col (CAS); Quintana Roo: Leona Vicario 1 female, 5.VI.1992, F. T. Hovore col (CAS); 12 km NW Nuevo Valladolid, 1 male, 26- 30.V.2012, Cole collection (CAS); 23 km SWCancun, 1 female, 2.VI.2001, Cope collection (CAS); GUATEMALA (new country record), Suchitepéquez: Finca San Rafael Olimpo (Cuyotenango), 1 female, 15.II.1966, J. M. Campbell col. (MZSP); Guatemala: 6.5 km SW Amatitlan, 1220m, 1 male, 23-31.VII.1979, E. L.
& K. W. Sleeper cols (CAS); COSTA RICA (new country record), Puntarenas: Playa Jaco, 1 male, 1 female, XII.1990, F. T. Hovore col. (LGBC). San Jos: La Caja, no date indicated, Schmidt col. (MZSP); 2 specimens, (unknown sex), 1934, Schmidt col. (MZSP). Guanacaste: 3 km SE Naranjo, 1 female, 18-28.XI.1991, F. D. Parker col. (LGBC); 1 female, 9-12.VII.1993, F. D. Parker col. (LGBC). PANAMA, Cocl: 2 km E El Valle, 07.II.1992, 6 males, 1 female, R. L. Penrose col. (CSCA); Panama: Cerro Campana, 1 female, 7.I.1994, J. E Wappes col (CAS).
Remarks. According to Pascoe (1858), when describing Dorcasta crassicornis, it belonged to “Mr. Saunders’s collection, without a locality.” Pascoe (1858) suggested Brazil as possibly the country where the specimen was collected. Actually, there are specimens from Brazil with a very similar general appearance. However, the three specimens from Brazil examined by us have some differences when compared with specimens from Mexico and Central America. Two of these specimens are the types of a new species described herein (D. birai). However, another specimen from the Brazilian state of São Paulo, belonging to the MZSP collection only differs from Mexico and Central America specimens by the yellow pubescent band at the center of the pronotum, which is somewhat wider (including comparison with the holotype of D. crassicornis). As we have only the single specimen from São Paulo, we prefer not to describe it as a new species. Blackwelder (1946) indicated, Argentina as a country where the species occurs, as doubtful. Franz (1954) included El Salvador Breuning; (1960, 1971) listed only Colombia; and Monné (2017) listed El Salvador, Panama and Colombia. We did not examine specimens from El Salvador and Colombia but, it is likely that the true D. crassicornis does occur in these countries.
Dorcasta crassicornis differs from all other species of the genus (except D. birai sp. nov.) by the dense erect setae on the ventral surface of the antennomeres. See remarks under D. birai.
description: Published as part of Bezark, Larry G., Santos-Silva, Antonio & Nascimento, Francisco E. De L., 2018, A synopsis of the genus Dorcasta Pascoe, 1858 (Coleoptera, Cerambycidae, Lamiinae, Apomecynini), pp. 49-68 in Zootaxa 4399 (1) on pages 57-61, DOI: 10.11646/zootaxa.4399.1.3, http://zenodo.org/record/1206454