Trichoxys giesberti Botero, Santos-Silva and Wappes, 2019

Botero, Juan Pablo, Santos-Silva, Antonio & Wappes, James E., 2019, New species, a new combination, and a new country record in American Clytini (Coleoptera: Cerambycidae: Cerambycinae), Insecta Mundi 697, pp. 1-19 : 2-4

Trichoxys giesberti Botero, Santos-Silva and Wappes , new species

( Fig. 1–4 )

Description of female. Integument mostly dark brown, almost black in some areas, especially head; palpi dark reddish-brown; labrum mostly dark reddish-brown; antennae and legs reddish-brown (slightly darker in some areas of femora); ventrites dark reddish-brown, except basal 2/3 of ventrite I dark brown.

Head. Frons finely, sparsely punctate; with dense yellowish-brown pubescence laterally (more yellowish depending on light intensity), gradually yellowish-white, slightly less dense toward central area, except median groove glabrous, as is triangular central area close to postclypeus; with a few long, erect yellowish setae laterally. Area between antennal tubercles with yellowish-white pubescence not obscuring integument toward frons, yellowish-brown (more yellowish depending on light intensity), dense toward upper eye lobes; remaining surface of vertex, and area behind upper eye lobes with dense yellowishbrown pubescence (more yellowish depending on light intensity) obscuring integument; with sparse, erect, yellowish-brown setae interspersed behind upper eye lobes; surface finely, moderately abundantly punctate. Area behind lower eye lobes moderately finely, sparsely punctate close to eye, smooth in remaining surface; with dense yellowish-brown pubescence close to eye (more yellowish depending on light intensity), gradually slightly lighter toward ventral surface, not obscuring punctures, with long, erect yellowish setae interspersed, glabrous on remaining surface. Genae finely, moderately abundantly punctate except smooth distal area; with light yellowish-brown pubescence, gradually sparser toward glabrous apex, with long, erect yellowish setae interspersed. Antennal tubercles glabrous, basally finely, sparsely punctate, smooth, on distal half. Median groove distinct from clypeus to area between upper eye lobes. Postclypeus with abundant yellowish-brown pubescence (more yellowish depending on light intensity) in wide central area, glabrous laterally. Labrum coplanar with anteclypeus at posterior half, inclined, nearly vertical, anterior half concave; with short, sparse yellowish setae with long, erect yellowish-brown setae interspersed in posterior half, longer laterally, and moderately short, erect yellowish setae in anterior half. Gulamentum smooth, glabrous in posterior half; anterior half gradually sloped toward distinctly elevated anterior margin, finely punctate (punctures gradually more abundant toward anterior margin), with moderately short, decumbent yellowish setae with long, erect brownish setae interspersed in anterior third. Distance between upper eye lobes 0.75 times length of scape; in frontal view, distance between lower eye lobes 0.88 times length of scape. Antennae 1.17 times elytral length, slightly surpassing base of posterior quarter of elytra; segments with yellowish-white pubescence not obscuring integument, gradually shorter toward distal segment; pedicel and antennomeres III–VI with long, erect reddish-brown setae ventrally, gradually sparser toward VI; antennomeres VII–IX with a few long, erect reddish-brown setae at ventral apex, gradually shorter toward IX; antennomeres III– X with long, erect reddish-brown setae dorsally, gradually shorter toward X. Antennal formula (ratio) based on length of antennomere III: scape = 1.43; pedicel = 0.43; IV = 1.17; V = 1.40; VI = 1.40; VII = 1.38; VIII = 1.33; IX = 1.19; X = 1.07; XI = 1.33.

Thorax. Prothorax slightly wider than long; sides uniformly rounded from anterolateral angles to basal constriction. Pronotum moderately finely, densely punctate; with transverse sulcus centrally in posterior constriction; with light yellowish-brown pubescence (yellower depending on light intensity) partially obscuring integument, slightly denser laterally, with moderately long, suberect brownish setae interspersed, and a few long, erect, pale yellow setae in sides of posterior area. Sides of prothorax with sculpturing and pubescence as in sides of pronotum, pubescence slightly sparser toward prosternum. Prosternum moderately finely, abundantly punctate, with dense yellowish pubescence, except nearly smooth, glabrous longitudinal band laterally, and smooth, nearly entirely glabrous area close to procoxal cavities; with sparse, long, erect yellowish setae. Mesoventrite with sparse yellowish-gray pubescence gradually denser toward sides; mesoventral process, mesanepisternum, and mesepimeron with dense yellowish pubescence. Metanepisternum and most of metaventrite with dense yellowish pubescence, sparser toward glabrous central area of metaventrite, and glabrous in narrow anterolateral area of metaventrite; sides of metaventrite with sparse, long, erect yellowish setae. Scutellum with dense light yellowish-brown pubescence.

Elytra. Very finely, abundantly punctate except smooth carina; dorsal carina well-marked from slightly before middle to near apex; apex wide, obliquely truncate, with minute projection at outer angle; with dense yellowish-brown pubescence obscuring integument. Legs. Femora with dense yellowish-white pubescence (slightly yellower in some areas depending on light intensity), except inner surface of metafemora partially glabrous. Tibiae with bristly yellowish pubescence not obscuring integument (more whitish depending on light intensity), denser, brownish in distal half of ventral surface of protibiae, moderately denser, yellowish-brown in distal area of ventral surface of meso- and metatibiae. Metatarsomere I 1.65 times as long as II–III together.

Abdomen. Ventrites I–IV with dense yellowish pubescence laterally (except sparse pubescence in basal area of III–IV), distinctly sparser centrally (more yellowish white toward glabrous posterior area) ventrite V with sparse yellowish-white pubescence except nearly glabrous basal area, with long, erect brownish setae interspersed; apex of ventrite V truncate, slightly emarginate centrally.

Dimensions (mm). Total length, 15.35; prothoracic length, 3.10; anterior prothoracic width, 3.25; posterior prothoracic width, 2.75; maximum prothoracic width, 3.80; humeral width, 4.30; elytral length, 10.05.

Type material. Holotype female from MEXICO, Sinaloa: 30 km W El Palmito , 2-9.X.1976, E. Giesbert col. ( FSCA) . Paratype female from MEXICO, Sinaloa: 20 miles NE of Concordia , 2.IX.1957, J. C. Schaffner ( TAMU).

Remarks. Trichoxys giesberti sp. nov. is similar to T. abbreviatus Bates, 1880 , but differs as follows: antennae reddish, distinctly surpassing middle of the elytra; antennomeres elongate, cylindrical; elytral pubescence not forming bands. In T. abbreviatus , the antennae are dark and do not reach the middle of the elytra, distal antennomeres widened, and elytral pubescence forming distinct bands. The new species differs from all the other species in the genus by the uniform elytral pubescence, completely lacking any bands or spots (present in one form or another in all other species of the genus). Trichoxys giesberti can be included in the Lingafelter and Wappes (2012) key to species (modified) as follows:

2a. Light colored pubescence of elytron restricted primarily to longitudinal stripe along most or all of suture (other patches of pubescence absent or very small)......................... 3

2b. Pubescence of elytron scattered in patches or other mostly uniformly distributed fascia..... 4

2c. Elytron uniformly covered in light to dark green pubescence; completely lacking fascia (distal tip of elytron may or may not be almost devoid of pubescence)......................................................................... Trichoxys giesberti new species

Etymology. Named to honor Edmund Giesbert (now deceased) skilled collector of long-horned beetles (including collector of the holotype) who collected throughout the American tropics and was a prolific contributor to our knowledge of New World Cerambycidae through his taxonomic writings and art illustrations.

Figures

Figures 1–8. 1–4) Trichoxys giesberti, holotype female. 1) Dorsal habitus. 2) Ventral habitus. 3) Lateral habitus. 4) Head, frontal view. 5–8) Megacyllene giesberti, holotype female. 5) Dorsal habitus. 6) Ventral habitus. 7) Lateral habitus. 8) Head, frontal view.