Trichalcidion penicillum Monné & Delfino, 1981

Monné, Miguel A., Nascimento, Francisco E. De L., Monné, Marcela L. & Santos-Silva, Antonio, 2019, New records, new genera, and new species in Acanthocinini (Lamiinae) from the Neotropical region, and new synonym in Cerambycinae (Coleoptera, Cerambycidae), Zootaxa 4624 (4), pp. 491-506 : 492-494

Trichalcidion penicillum Monné & Delfino, 1981

( Figures 3–6 )

Trichalcidion penicillum Monné & Delfino, 1981: 261 ; Monné, 2018: 183 (cat.).

Description. Male. Integument mostly dark brown; mouthparts dark reddish brown except blackish distal palpomeres; posterior area of gulamentum reddish brown; antennomeres III–V brown with dark–brown apex; antennomeres VI–VII yellowish brown on basal half, reddish-brown, gradually darkened toward apex (missing antennomeres VIII–XI); antennal tubercles with wide black macula basally; pronotum with anterior gibbosities partially black, and with one elliptical black macula on each side of posterior half; elytra black on narrow area close to sides of scutellum, and on subcircular areas on posterior half; scutellum black laterally; coxae reddish brown; peduncle of femora dark reddish brown; protibiae with wide dark reddish-brown ring about middle; meso- and metatibiae with wide dark reddish-brown ring before middle; basal half of meso- and metatarsomere I reddish-brown; meso- and metatarsomere V reddish brown, gradually darkened toward apex; distal area of abdominal ventrites I–IV yellowish-brown.

Head. Frons moderately coarsely, sparsely punctate; with yellowish-brown pubescence partially obscuring integument, yellower close to eyes and clypeus, interspersed with long, erect, sparse setae, brownish basally, yel- low toward apex. Vertex finely, sparsely punctate (punctures sparser centrally); with yellowish-brown pubescence on central area between antennal tubercles, not obscuring integument, sparser yellowish-brown on remaining wide central area of vertex, except narrow yellow pubescent band close to upper eye lobes, and small, diamond glabrous area on central region between antennal tubercles and upper eye lobes. Antennal tubercles finely, densely punctate; with brownish pubescence not obscuring integument on dark area (looking blackish due to the color of integument), yellowish brown, partially obscuring integument on remaining surface except glabrous apex. Area behind eyes with yellowish-brown pubescence close to eye (this area narrowed toward inferior side of lower eye lobe), gradually bristly toward inferior side of lower eye lobe, glabrous on remaining surface. Genae with yellowish-brown pubescence distinctly not obscuring integument, especially toward ventral surface, except glabrous distal area. Postclypeus transversely divided by narrow carina, with anterior area distinctly lower than posterior one; with yellow pubescence centrally on area close to frons, glabrous laterally; with yellow pubescence on wide central region of lower area, glabrous laterally; with long, erect, sparse yellow setae on pubescent area, especially anteriorly. Labrum coplanar with anteclypeus at posterior 3/4, inclined at anterior quarter; with yellowish-brown pubescence, not obscuring integument, interspersed with some long, erect setae of same color on posterior 3/4, nearly glabrous on posterior quarter. Gulamentum smooth, glabrous on large posterior area, slightly depressed, densely, minutely punctate anteriorly; with short grayish-white pubescence on depressed area, not obscuring integument. Distance between upper eye lobes 0.16 times length of scape; in frontal view, distance between lower eye lobes 0.52 times length of scape. Antennae (from base of scape to apex of antennomere VII) 2.0 times elytral length, reaching elytral apex at distal third of antennomere V; with yellowish-brown pubescence not obscuring integument, slightly darker on darkened area of antennomeres; antennomeres III–IV with a few short, sub-erect, dark spine-shaped setae ventrally, and long, erect yellowish setae also ventrally. Antennal formula (ratio) based on length of antennomere III: scape = 0.87; pedicel = 0.08; IV = 1.02; V = 0.93; VI = 0.83; VII = 0.82.

Thorax. Prothorax 1.3 times wider than long; with narrow, distinctly constricted anteriorly near margin; sides widely rounded centrally, with posterior area of this area forming conical tubercles on sides of pronotum; area between lateral tubercle and posterior margin moderately narrowed, parallel-sided. Pronotum with large U-shaped gibbosity in central region of anterior half, distinctly more elevate laterally; area inside of U-shaped gibbosity depressed, especially toward anterior margin, coarsely, moderately sparsely punctate centrally, and a few small asperities anteriorly; coarsely, moderately sparsely puncture on sides of central area; coarsely, moderately abundantly punctate on posterior quarter (punctures coarser and deeper than remaining central punctures; forming sinuous two rows); sides coarsely, sparsely punctate toward rounded sides of prothorax; remaining surface smooth; pubescence mostly pale yellow, with irregular yellow pubescent macula on sides of anterior half, sparser and brownish on dark areas (looking darker due to the color of integument), narrow yellow macula close to outer side of U-shaped gibbosity, and yellow pubescent band on center of distal half (denser close to posterior margin). Sides of prothorax with pale-yellow pubescence not obscuring integument, slightly sparser anteriorly. Ventral surface of thorax with yellowish-brown pubescence, partially obscuring integument on some areas (more grayish-white depending on light intensity), yellower on sides of mesothorax. Scutellum with brownish pubescence on dark areas, yellowish centrally. Elytra. Coarsely, sparsely punctate; with dense tuft of long, dark setae on anterior and posterior crests; pubescence mostly yellowish brown, irregularly interspersed with yellower pubescence, except: black areas with brownish pubescence (looking darker due to the color of integument); narrow, interrupted white pubescent band on innermost carina, distinctly curved sideward posteriorly; white pubescent spot on outermost dorsal carina before midlength; white pubescent band close to suture on posterior third; moderately wide, longitudinal yellow pubescent band on posterior third, between innermost carina and suture; narrowly yellow pubescent on remaining surface of dorsal carinae. Elytral surface with moderately long, dark, sparse setae; apex widely, obliquely truncate, with spiniform outer angle. Legs. Femora with yellowish pubescence not obscuring integument, interspersed with long, erect yellowish-white setae on distal half. Tibiae with yellowish pubescence not obscuring integument, interspersed with long, erect yellowish-white setae throughout. Tarsi with yellowish pubescence on light area, brownish, sparser on darker area.

Abdomen. Ventrites with yellowish-brown pubescence not obscuring integument (looking grayish-white or brownish depending on light intensity), interspersed with long, erect yellowish setae laterally (more abundant on V); distal margin of ventrite V distinctly notched semi circularly, with sides forming long spiniform projection.

Dimensions (mm). Total length, 10.10; prothoracic length, 1.70; anterior prothoracic width, 1.75; posterior prothoracic width, 1.90; maximum prothoracic width, 2.25; humeral width, 3.20; elytral length, 7.05.

Material examined. COLOMBIA (new country record), Santander: NE of Bucaramanga (near Morro Ventanas; 07º08’43”N / 73º01’52”W; 2250 m), 1 male, 13-15.IV.2017, Sinyaev & Pinilla col. ( MZSP) .

Remarks. The male examined is the second formally known specimen of the species. The holotype female from Venezuela (Barinas, San Isidro, 14 km S La Soledad) was deposited in the MNRJ and, unfortunately, was destroyed in the recent fire (September 2, 2018).

Figures

FIGURES 1–7. 1–2, Leptostylus retrorsus, dorsal habitus: 1, Female; 2, Lectotype male. 3–6, Trichalcidion penicillum, male: 3, Dorsal habitus; 4, Head, frontal view; 5, Ventral habitus; 6, Lateral habitus. 7, Lagocheirus araneiformis flavolineatus, dorsal habitus.