Adetus salvadorensis Franz, 1954

Santos-Silva, Antonio, Pérez-Flores, Oscar & Botero, Juan Pablo, 2024, Taxonomic notes, new species, and new records of Neotropical Cerambycidae (Coleoptera), The Canadian Entomologist (e 21) 156, pp. 1-20 : 12-15

Adetus salvadorensis Franz, 1954

( Figs. 7 , 8 )

Redescription. Male ( Fig. 7A–D ). Integument mostly dark brown; palpomeres brown with yellowish-brown apex.

Head. Frons densely, coarsely punctate; with abundant pale-yellow pubescence partially obscuring integument, and short, erect white setae interspersed on the area between antennal tubercles and upper eye lobes with sculpturing, pubescence, and erect setae as on frons; area between eyes and prothorax sparsely, coarsely punctate anteriorly, smooth close to prothorax; with dense pale-yellow pubescence obscuring integument, except glabrous median groove, with decumbent white setae interspersed, pubescence shorter and thicker than on frons, and white setae forming irregular white maculae anteriorly. Area behind eyes with pubescence as on posterior region of vertex, pubescence gradually slender and longer towards ventral surface. Genae with abundant pale-yellow pubescence partially obscuring integument, and moderately abundant, decumbent white setae interspersed. Antennal tubercles slightly elevated; with sculpturing, pubescence, and setae as on frons, except smooth apex. Postclypeus with abundant, both pale-yellow and white pubescence partially obscuring integument, except sides partially glabrous; with a few long, erect yellowish-brown setae on each side of wide central area. Labrum with moderately abundant, yellowish-white pubescence not obscuring integument on posterior quarter; remaining surface with moderately abundant yellowish-white pubescence not obscuring integument, except apex with fringe of short, yellowish-brown setae, and long, erect yellowish-brown setae interspersed, erect setae more abundant laterally. Outer side and dorsal surface of basal third of mandibles with dense pale-yellow pubescence and short, decumbent white setae interspersed; remaining surface glabrous. Distance between upper eye lobes 0.46 times the distance between outer margins of eyes; in ventral view, distance between lower eye lobes 0.70 times the distance between outer margins of eyes; inner margin of upper eye lobes wide, rounded. Antennae 0.8 times elytral length, almost reaching middle of elytra. Scape with dense pale-yellow pubescence dorsally, with decumbent white setae interspersed, and slightly sparser pale-yellow pubescence on remaining surface, except inner surface with abundant white pubescence. Pedicel with abundant, both pale-yellow and white pubescence partially obscuring integument; with long, erect yellowish-brown setae interspersed ventrally. Antennomere 3 with abundant light yellowish-brown pubescence dorsally, with decumbent white setae interspersed, and abundant white pubescence not obscuring integument on remaining surface; with long, erect yellowish-brown setae interspersed ventrally. Antennomere 4 with abundant yellowish-brown pubescence dorsally, with decumbent white setae interspersed, and abundant white pubescence on remaining surface, except abundant light brown pubescence not obscuring integument on part of posterior half of ventral surface; with sparse, long, erect yellowish-brown setae interspersed ventrally. Antennomeres 5–8 with dense white pubescent ring basally and apically, sparse white pubescence dorsally and laterally, and abundant light brown pubescence not obscuring integument on remaining ventral surface; with a few long, erect dark setae interspersed ventrally. Antennomeres 9–10 with dense white pubescent ring basally and apically, and abundant brown pubescence not obscuring integument on remaining surface; with a few long, erect dark setae interspersed ventrally. Antennomere 11 with abundant brown pubescence not obscuring integument, except apex with short, bristly white setae. Antennal formula (ratio) based on length of antennomere 3: scape = 0.50; pedicel = 0.14; antennomere 4 = 0.47; antennomere 5 = 0.37; antennomere 6 = 0.35; antennomere 7 = 0.32; antennomere 8 = 0.32; antennomere 9 = 0.29; antennomere 10 = 0.26; antennomere 11 = 0.29.

Thorax. Prothorax slightly longer than wide; sides gradually, slightly rounded widened on anterior quarter, subparallel sides on remaining surface. Pronotum inclined from anterior to posterior margin; with slightly elevated longitudinal carina centrally; abundantly, coarsely punctate, punctures partially confluent close to posterior half of longitudinal carina; with abundant pale-yellow pubescence partially obscuring integument, pubescence more yellowish brown centrally, and decumbent white setae interspersed, white setae denser on sides of central region. Sides of prothorax abundantly, coarsely punctate; with abundant, both pale-yellow and white pubescence partially obscuring integument. Sides of prosternum with abundant, both pale yellow and with pubescence partially obscuring integument; central region with sparse white pubescence. Prosternal process gradually widened from base to apical forth, then strongly widened; with abundant pubescence not obscuring integument, pubescence partially pale yellow centrally, white on remaining surface. Mesoventrite with abundant white pubescence not obscuring integument on anterior region, except pale-yellow pubescence close abrupt inclined area and sides; area close to sides of procoxal cavities with abundant, both pale-yellow and white pubescence not obscuring integument. Mesanepisterna, mesepimera, metanepisterna, and sides of metaventrite with dense, both pale-yellow and white pubescence; central region of metaventrite with abundant white pubescence partially obscuring integument, with pale-yellow pubescence interspersed, except glabrous metathoracic discrimen. Mesoventral process with abundant white pubescence not obscuring integument and a few decumbent pale-yellow setae interspersed. Scutellum with abundant, both yellow and white pubescence partially obscuring integument.

Elytra. Coarsely, abundantly punctate, punctures sparser, finer on posterior quarter, aligned on inner region of dorsal surface between anterior and posterior quarters, with area between punctures slightly elevated; anterior 3/4 of dorsal surface with dense yellowish-brown pubescence, sparser close to posterior quarter, and abundant white pubescence interspersed on anterior third, then sparser towards middle, and forming dashed band close to suture between middle and posterior quarter, except large macula with sparser dark yellowish-brown pubescence on sides of middle; sides with abundant, both dark yellowish-brown and white pubescence not obscuring integument from base to apex, white pubescence sparser on wide central region and denser on posterior quarter; posterior quarter of dorsal surface with dense, somewhat comma-shaped, white, pubescent macula, except centre with large pale-yellow pubescent macula; dorsal area between comma-shaped macula and suture with abundant yellowish-brown pubescence not obscuring integument, pubescence distinctly darker anterocentrally. Legs. Femora with abundant, both pale-yellow and white pubescence not obscuring integument, pale-yellow pubescence more abundant on profemora, except metafemoral club partially with dark yellowish-brown pubescence on inner surface. Tibiae with abundant, both pale-yellow and white pubescence partially obscuring integument, except dark pubescence on apical third of ventral surface; apical third of dorsal surface of mesotibiae and metatibiae with fringe of short, erect dark brown setae, denser on mesotibiae; metatibiae distinctly widened towards apex than protibiae and mesotibiae. Dorsal surface of tarsomeres with both dark brown and white pubescence not obscuring integument; metatarsomere 1 distinctly shorter than metatarsomeres 2–3 together.

Abdomen. Ventrites with dense, both light yellowish-brown and white pubescence; apex of ventrite 5 truncate.

Dimensions. Total length, 10.95 mm; prothoracic length, 2.60 mm; anterior prothoracic width, 2.05 mm; posterior prothoracic width, 2.30 mm; maximum prothoracic width, 2.45 mm; humeral width, 2.85 mm; elytral length, 7.95 mm.

Material examined. MEXICO (new country record), Oaxaca: MX190, 16 km E Tapanatepec [San Pedro Tapanatepec ], flowering tree daylight, 1 male, 13.vi.2009, Skillman and Hildebrandt ( FWSC) .

Remarks. As with other species of Adetus , A. salvadorensis presents a certain degree of variation in the distribution of pubescence and in the colour of pubescence in some areas. In the specimen from Mexico, the white pubescence is more distinct on the anterior half of elytra (distinctly sparser in the holotype), the dark pubescent area on sides of elytra is conspicuous (almost absent on dorsal middle of elytra and absent laterally in the holotype). Additionally, the mesoventral process is slightly longer than in the holotype ( Fig. 8 ), but we consider this small difference to be intraspecific variation because this also occurs in other species of the genus. The photograph of the holotype in the original description ( Fig. 7E ) suggests that there is a black area on each side close to the posterior margin of the pronotum. However, this dark area does not exist, indicating a problem with the photograph in the original description. It is worth mentioning that Franz (1954) did not describe the existence of this dark area.

Currently, the species is known from El Salvador, Guatemala, Honduras, and Panama ( Bezark 2023; Monné 2023b; Tavakilian and Chevillotte 2023).

Figures

Figure 7. Adetus salvadorensis Franz, 1954. A–D, Male from Mexico (Oaxaca): A, dorsal habitus; B, ventral habitus; C, lateral habitus; D, head, frontal view. E, Adetus salvadorensis, holotype, from Franz (1954).

Figure 8. Adetus salvadorensis Franz, 1954, holotype: A, dorsal habitus; B, ventral habitus; C, lateral habitus; D, head, frontal view; E, labels. Photographs by Laura Marrero Palma (SMFD).