Adetus, LeConte, 1852

Santos-Silva, Antonio, Nascimento, Francisco E. de L. & Wappes, James E., 2019, Nomenclatural changes in American Apomecynini including description of new genera and species (Coleoptera: Cerambycidae), Insecta Mundi 716 (716), pp. 1-35 : 7-8

Adetus x-fasciatus Santos-Silva, Nascimento and Wappes, sp. nov.

( Fig. 22–27 )

Description. Male ( Fig. 22–25 ). Integument dark reddish-brown; head dark brown; palpomeres reddishbrown, gradually yellowish-brown toward apex; antennomeres III–XI reddish-brown.

Head. Frons coarsely, abundantly punctate; with yellowish pubescence, slightly more yellowish-brown toward vertex, obscuring integument (including most punctures). Vertex coarsely, abundantly punctate, except smooth area close to prothoracic margin; with yellowish pubescence not obscuring punctures, except denser pubescence close to prothorax. Area behind eyes with pubescence and punctures as on anterior area of vertex, slightly sparser toward ventral surface of head. Genae 1.7 times length of lower eye lobe; coarsely punctate on half close to eye, smooth anteriorly; with yellowish pubescence, slightly shorter than on frons. Antennal tubercles with sculpturing as on frons basally, shallower, slightly sparser toward apex; pubescence as on frons. Median groove barely visible from area between antennal tubercles to prothorax, absent on frons. Postclypeus with pubescence as on frons, but mostly directed forward. Labrum coplanar with anteclypeus at posterior half, inclined at anterior half; finely, abundantly punctate on coplanar area, nearly smooth on anterior half; with yellowish-brown pubescence partially obscuring integument on coplanar area, distinctly sparser on anterior half, with long, erect setae of same color interspersed directed forward; anterior margin with short fringe of yellow setae. Distance between upper eye lobes 0.76 times length of scape; in frontal view, distance between lower eye lobes 1.44 times length of scape. Antennae 0.87 times elytral length, slightly surpassing middle of elytra; scape, pedicel, and antennomeres III–IV with light yellowish-brown pubescence, interspersed with whitish pubescence, partially obscuring integument; remaining antennomeres with light yellowish-brown pubescence anteriorly and posteriorly, white centrally (less so on XI); ventral surface of antennomeres III–VII with short, erect yellowish-brown setae ventrally, gradually sparser toward VII. Antennal formula (ratio) based on length of antennomere III: scape = 0.62; pedicel = 0.20; IV = 0.62; V = 0.40; VI = 0.36; VII = 0.34; VIII = 0.33; IX = 0.29; X = 0.25; XI = 0.29.

Thorax. Prothorax about 1.2 times wider than long; sides rounded centrally; anterior margin narrower than posterior one. Pronotum coarsely, abundantly punctate except nearly smooth on narrow, longitudinal central area; this area covered by dense yellowish pubescence, from base to apex, with dense pubescence of same color laterally (inner margin of this area oblique); areas between dense bands with sparser, yellowish-brown pubescence; entire pubescence with short, thick white setae interspersed (somewhat scale-shaped). Sides of prothorax with dense yellowish pubescence close to pronotum and prosternum, sparser on wide central area. Ventral surface of thorax with dense yellowish pubescence slightly sparser, with white pubescence interspersed on central area of metaventrite. Scutellum with dense yellowish pubescence.

Elytra. Parallel-sided for anterior 2/3, gradually narrowed for posterior third, apex evenly rounded; coarsely, sparsely punctate dorsally; pubescence mostly light yellowish-brown, obscuring integument, except: two longitudinal, narrow, fragmented whitish pubescent bands from basal to apical quarter dorsally; wide, semicircular whitish pubescent bands laterally, with yellowish pubescence interspersed, extending from area close to humerus to posterior third, not reaching suture, collectively, when viewed from above, forming a large “X” shape; wide, oblique yellowish pubescent band across posterior quarter, connecting across suture, with white pubescence interspersed; narrow, fragmented white pubescent band along suture.

Legs. Femora and tibiae with yellowish pubescence interspersed with white pubescence, nearly obscuring integument; mesotibiae distinctly dorsally notched at distal third; metatibiae with two, indistinct, dorsal transverse sulci at distal half, slightly elevated dorsally at beginning of distal quarter, then shallowly depressed; apex about 2.5 times wider than base.

Abdomen. Ventrites with yellowish pubescence partially obscuring integument, with white pubescence interspersed centrally, except sides of II–V with large (smaller in V), sparsely pubescent subcircular darker area laterally (some of them with glabrous areas); ventrite V not longitudinally sulcate centrally.

Female ( Fig. 26–27 ). Integument mostly dark brown to piceous, with the pubescence darker than the male holotype; palpomeres mostly yellowish-brown, gradually lighter toward apex; antennomeres dark brown. Dense pubescent bands on pronotum yellowish-white. Mesoventral process and central area of metaventrite entirely with white pubescence; meso- and metatibiae as in male, but metatibiae with apex about twice width of basal area. Abdominal ventrite V slightly longitudinally sulcate at anterior 2/3 centrally.

Dimensions (mm), holotype male/ paratype female. Total length 9.25/7.50; prothoracic length 2.00/1.70; anterior prothoracic width 1.85/1.65; posterior prothoracic width 2.20/1.85; maximum prothoracic width 2.35/1.95; humeral width 2.95/2.35; elytral length 6.75/5.30.

Type material. Holotype male from PARAGUAY, Presidente Hayes (no detailed place), 13.XI.1993, no collector indicated ( MZSP) . Paratype female from ARGENTINA, Chaco: 2 km N junction to Isla del Cerrito, 24.I.1989, C.W. and L. O’Brien and G. Wibmer col. ( ACMT).

Remarks. Breuning (1971) redescribed Adetus pusillus ( Fairmaire and Germain, 1859) , with the redescription agreeing very well with the photograph of the holotype ( Fig. 28 ). A single specimen identified as A. pusillus in the MZSP collection ( Fig. 22–25 ) differs notably from that species (by the general shape, prothoracic shape, pubescence, punctation, etc.) and is an example of the new species A. x-fasciatus sp. nov. In Bezark (2019), there is another specimen identified as A. pusillus that is also A. x-fasciatus sp. nov. This latter specimen is from Chile (“ Isla de Ozo”) and belonged to the MNRJ collection. That speci- men was destroyed in the fire that completely consumed the MNRJ in 2018. Thus, it is not possible to include it as a paratype. Furthermore, we were not able to find any place in Chile named “ Isla de Ozo.” For this reason, we consider it doubtful that Chile is a country where A. x-fasciatus sp. nov. occurs.

Zajciw and Monné (1968) recorded A. pusillus for Uruguay and reported (translated): “Described from Chile, subsequently recorded by Bruch for Formosa ( Argentina). Very interesting finding for the country’s fauna.” Unfortunately, it is not possible to check if the records of A. pusillus for Uruguay and Argentina ( Formosa) were really based on specimens of A. pusillus .

Adetus x-fasciatus sp. nov. resembles A. atomarius invittatus Breuning, 1971 by its light-colored dorsal pattern but it differs as follows: A. x-fasciatus sp. nov. with central subcircular pubescent band of the elytra wide, well-marked and contiguous throughout; in A. atomarius invittatus this band is narrower (or almost absent) with the distal portion more lateral, typically smaller and separated from the apical portion; in the former the lateral pubescent band at distal third is wide, in the latter species it is narrow and often reduced to a small, irregular fascia.

Etymology. Named for the light colored, x-shaped fascia on the elytra.

Figures

Figures 22–28. Adetus spp. 22–27) Adetus x-fasciatus sp. nov.: 22) Dorsal habitus, holotype male. 23) Ventral habitus, holotype male. 24) Lateral habitus, holotype male. 25) Head, frontal view, holotype male. 26) Dorsal habitus, paratype female. 27) Ventral habitus, paratype female. 28) Adetus pusillus, holotype, dorsal habitus.