Dorcasta borealis Breuning, 1940

Bezark, Larry G., Santos-Silva, Antonio & Nascimento, Francisco E. De L., 2018, A synopsis of the genus Dorcasta Pascoe, 1858 (Coleoptera, Cerambycidae, Lamiinae, Apomecynini), Zootaxa 4399 (1), pp. 49-68 : 53-55

Dorcasta borealis Breuning, 1940

( Figs 6–11 , 39–41 )

Dorcasta borealis Breuning, 1940: 207 .

Redescription. Integument mostly dark brown; scape and pedicel dark brown; antennomeres III–VIII dark reddish-brown, darkened on narrow distal area of antennomeres III–IV; antennomeres IX–XI dark brown; meso- and metatibiae reddish- brown on about basal half, gradually darkened toward apex (sometimes entirely dark brown); tarsomere V reddish-brown on about basal half, dark brown on distal half.

Head. Frons moderately finely and abundantly punctate; pubescence nearly obscuring integument, pale yellow, denser close to lower eye lobes (from antennal tubercles to apex of gena), yellowish-white on remaining surface; without short, thick, slender scale-like setae; with sparse long, dark erect, setae. Antennal tubercles with yellowish-brown pubescence not obscuring integument. Dorsal surface moderately finely, abundantly punctate; with longitudinal, pale yellow pubescent band on each side, from upper eye lobe to prothoracic margin; remaining surface with yellowish-brown pubescence, interspersed with a few yellowish or white setae, not obscuring integument; with sparse long, dark erect, setae. Area behind lower eye lobes with slightly oblique, moderately wide pale yellow pubescent band, from eye to prothorax, not connected to pubescent band behind upper eye lobe; remaining surface with yellowish-brown pubescence not obscuring integument; with sparse long, dark erect, setae. Genae with punctures slightly coarser than on frons; with yellowish-brown pubescence not obscuring integument except pale yellow pubescent band starting on frons; with sparse long, dark erect, setae. Distance between upper eye lobes 0.40 times length of scape; in frontal view, distance between lower eye lobes 0.6 times length of scape. Antennae in female 1.30 times elytral length, reaching about distal fifth of elytra; in male 1.45 times elytral length, slightly surpassing elytral apex. Scape with sparse long (from shorter to longer than diameter of scape), dark erect, setae ventrally. Pedicel and antennomeres III– X with long (from about as long as diameter of antennal segment to almost 3 times) , dark erect, setae ventrally (gradually sparser toward X), moderately abundant on basal antennomeres, but not dense. Antennal formula (ratio) based on length of antennomere III (male/female; only one couple measured): scape = 1.19/1.34; pedicel = 0.31/0.34; IV = 1.12/1.15; V = 0.91/0.96; VI = 0.77/0.81; VII = 0.73/0.73; VIII = 0.63/0.65; IX = 0.56/0.61; X = 0.49/0.57; XI = 0.65/0.73.

Thorax. Prothorax cylindrical, slightly or not narrowed basally , not widened centrally. Pronotum coarsely, abundantly punctate; with wide, longitudinal pale yellow pubescent band laterally, from base to apex, and slender, longitudinal pale yellow pubescent band centrally; remaining surface with yellowish-brown pubescence not obscuring integument; with sparse long, dark erect, setae. Sides of prothorax with sculpturing as on pronotum ; with wide, longitudinal pale yellow pubescent band close to ventral side, with yellowish-white pubescence not obscuring integument, with yellowish-brown pubescence interspersed on remaining surface; with sparse long, dark erect, setae. Ventral side of thorax with yellowish-white pubescence not obscuring integument, except laterally wide (especially on mesanepisternum and mesepimeron), longitudinal pale yellow pubescent band from mesanepisternum to apex of metaventrite, usually also covering basal third of metanepisternum. Metaventrite moderately coarsely, abundantly punctate laterally. Scutellum with pale yellow pubescence obscuring integument. Elytra. Coarsely, moderately abundantly punctate on basal third, gradually sparser toward apex, less so laterally ; apex with long, thick spine at outer angle, slightly concave toward short sutural spine (sometimes sutural angle only projected); with sparse long, dark erect, setae throughout; pubescence as follows: dorsally with wide pale yellow pubescent band from base to apex , not reaching suture or lateral curvature, widened after basal eighth; with longitudinal pale yellow pubescent band close to lateral curvature; with yellowish-white pubescence not obscuring integument on remaining surface. Legs. Metafemora in male notably widened ( Fig. 6 ); in female ( Fig. 7 ) widened , but distinctly less than in male.

Abdomen. Ventrites moderately coarsely, sparsely punctate (slightly denser laterally); with yellowish-white pubescence partially obscuring integument, except longitudinal pale yellow pubescent band on ventrites I–IV; ventrite V in female depressed distally (not so in male).

Dimensions (mm), male/female. Total length, 5.35–5.80/5.55–6.15; prothoracic length, 1.05–1.10/1.05–1.15; basal prothoracic width, 0.75–0.80/0.75–0.80; distal prothoracic width, 0.80–0.85/0.80–0.90; greatest prothoracic width, 0.85–0.90/0.80–0.90; humeral width, 0.95–1.00/0.95–1.05; elytral length, 3.85–4.05/3.80–4.30.

Material examined. COSTA RICA (new country record), Guanacaste : Santa Rosa National Park (on dried vines), 5 males, 2 females, 1.VI.2002, F. T. Hovore col. ( LGBC, CAS; 1 male, MZSP) . NICARAGUA, Carazo: 1 mi SE Jinotepe, 1 female, 14.VII.1974, C.W. & L.B. O’Brien & G.B. Marshall col. ( LGBC) .

Remarks. Dorcasta borealis differs from D. implicata Melzer, 1934 ( Fig. 34 ), by the dorsal elytral pale yellow pubescent band not interspersed with moderately large irregular spots distinctly exposing the integument (present in D. implicata ). It can be separated from D. quadrispinosa Breuning, 1940 ( Fig. 38 ) by the sutural apices of the elytra without a long spine (usually present in D. quadrispinosa ), and by the outer apical spine of the elytra distinctly separated from the sutural spine (inner side sub-fused with the sutural spine in D. quadrispinosa ).

Although not reported by Breuning (1940) photographs of the holotype indicate it is a female.

Figures

FIGURES 1–7. 1–5, Dorcasta dasycera: 1, dorsal habitus, female; 2, Ventral habitus, female; 3, head, frontal VieW, female; 4, meso- and metafemora, male; 5, lateral habitus, female. 6–7, Dorcasta borealis: 6, meso- and metafemora, male; 7, meso- and metafemora, female.

FIGURES 8–13. 8–11, Dorcasta borealis: 8, dorsal habitus, male; 9, Ventral habitus, male; 10, head, frontal VieW, male; 11, lateral habitus, male. 12–13, Dorcasta parkeri, holotype male:12, head, frontal VieW; 13, dorsal habitus.

FIGURES 39–41. Dorcasta borealis holotype female: 39, dorsal habitus; 40, lateral habitus; 41, labels.

FIGURES 33–38. 33, Dorcasta singularis, holotype male, dorsal habitus. 34, D. implicata, unknoWn seX, dorsal habitus. 35– 37, D. crassicornis, holotype: 35, dorsal habitus; 36, head, frontal VieW; 37, labels. 38, D. quadrispinosa, female, dorsal habitus.