Luctithonus duartensis Lingafelter, 2020

Lingafelter, Steven W., 2020, New genera, species, and records of Acanthocinini (Coleoptera: Cerambycidae: Lamiinae) from Hispaniola, Insecta Mundi 754, pp. 1-23 : 9-11

Luctithonus duartensis Lingafelter , new species

( Fig. 5e, f, g , 6 )

Diagnosis. The elytra and pronotum lack pubescence with a green tinge that is present in L. aski and L. pantherinus . Each elytron has a bold longitudinal black macula on the outer margin extending from the humerus, along the upper margin of the epipleuron and extending onto the disk, toward suture, at the apical fourth or fifth, not present in the other species. This portion is margined anteriorly with white pubescence. One or two additional small, white, pubescent maculae are present at the middle of each elytron which are otherwise reddish-brown. The scape is uniformly pale, reddish-brown or with a slightly darker base. The base of the antennal tubercles near the head midline are covered in very dark pubescence.

Description. Length: 6.2–6.5 mm; width: 3.0– 3.5 mm.

Head: Covered in vestiture of short, dense, tan and golden setae except for dark brown setose ring around base of antennal tubercle; impunctate. Narrow median-frontal line well-delineated and extending from clypeal margin to occiput. Antenna: Extending beyond apex of elytra by four to five antennomeres; covered with very short, dense, appressed, semi-translucent brown pubescence with a few scattered longer, stiff setae, especially near the apex of some antennomeres. Antennomeres orange-ochre with most segments having subtly dark brown apices. Scape orange-ochre with extreme apex partially darker brown and sometimes base with darker setae; cylindrical beyond constricted base, extending nearly to posterior margin of pronotum. Antennomeres 3–6 slightly decreasing in length successively; 6–10 subequal in length to one another. Antennomere 11 weakly curved, shorter than penultimate. Eye: lower eye lobe over 2.5 times longer than gena below it; over twice height of upper eye lobe; lobes connected by 3–4 rows of ommatidia. Upper eye lobes separated by a little more than 1.5 times their thickness. Mouthparts: frontoclypeal margin with mostly appressed golden semitranslucent setae (longer at sides), some of which extend to base of labrum. Clypeus pale yellow, nearly glabrous. Labrum pale yellow with fringe of ochraceous setae at base, otherwise glabrous. Mandibles reddish-brown with dark brown delineation on outer margin; mostly glabrous. Labial and maxillary palpi pale yellow, much lighter in color than head integument.

Thorax: Pronotum very broad (1.8 × wider than long) but narrower than elytral base; reddish-brown, mostly covered with appressed ochre, dark brown, and reddish-brown pubescence creating a pattern of darker spots separated by lighter pubescent patches. Broad lateral tubercles present with subacute apices posteromedially positioned. Pronotum mostly impunctate except for row of large, deep, non-seta bearing, ovoid punctures along posterior margin terminating behind lateral tubercles; impunctate elsewhere. Scutellum piceous on lateral margins to apex with center and apex reddish-brown and mostly covered with ochre pubescence. Prosternum impunctate and covered with short vestiture of translucent, appressed setae; integument reddish-brown. Prosternal intercoxal process over 1/3 width of procoxa at narrowest point, very broadly expanded at apex, wider than procoxa, closing procoxal cavities posteriorly. Mesosternum short, distance between pro- and mesocoxae about the same as width of prosternal process between procoxae; covered mostly by short translucent, appressed setae; integument reddish-brown and impunctate. Mesosternal intercoxal process just under 1.5 times the width of prosternal process between coxae. Metasternum reddish-brown, covered with appressed and mostly translucent pubescence; impunctate. Elytra: 5.8–6.2 mm long; each 1.5–1.7 mm wide; tapering toward apex; covered in vestiture of short, appressed, dense, ochre, dark brown, and white setae. Dark brown macula extends from humerus along lateral margin and extends to middle of disk at apical fifth. Small patch of white pubescence present in dark macula at middle and apical third. Large, oval, deep, non-seta bearing punctures scattered throughout, becoming less dense and shallower toward apex. Erect setae absent. Each elytron with pronounced mediobasal tubercle ornamented with tuft of longer dark brown setae. Moderate depression behind basal tubercles. Elytral apices obliquely truncate with outer apex more produced than sutural apex. Epipleural margin vertical and rounded to disk. Legs: covered in short, appressed translucent, brown, and white pubescence. Femora moderately clavate, mostly yellow-orange with diffuse darker spots on ventral side. Tibiae with distal halves very dark brown, basal third light brown, and narrowly pale orange between. Tarsomeres mostly pale orange with apices of first, second, and sometimes fifth darker brown. Legs relatively short with metafemora not extending to elytral apex.

Abdomen: Uniformly pale reddish-brown in male; with fifth ventrite dark brown at sides in female; overall, distinctly lighter than ventral thorax; covered with short, appressed ochre or translucent setae; impunctate. Fifth ventrite of 1.5 times longer than fourth ventrite and with short, longitudinal carina at base in female (lacking in male).

Etymology. The specific epithet, duartensis , is named for the locality of Pico Duarte in the Dominican Republic where all the specimens have been collected.

Type material. Holotype: Dominican Republic: Pico Duarte Trail, Los Tablones , 3300′, 19°08.222′N, 70°27.736′W, beating, 29 June 2004, S. Lingafelter (male, USNM) . Paratypes: all Dominican Republic: Pico Duarte Trail , below La Compartición, 2450 m, 19°02.254′N, 70°58.155′W day collecting, 2 July 2004, Charyn J. Micheli (1, SWLC; 1, USNM), La Vega Province, Cordillera Central, 4.1 km SW El Convento, 18°50′37″N; 70°42′48″W, 1730 m, 31 May 2003, J. Rawlins, R. Davidson, C. Young, C. Nunez, P. Acevedo, dense secondary evergreen forest with pine, UV light, sample 22212 , Carnegie Museum Specimen Number CMNH-316,766 (1, CMNH) .

Figures

Figure 5. Luctithonus species. a) L. aski Lingafelter, new species, holotype male. b) L. aski Lingafelter, new species, paratype female. c) L. pantherinus (Zayas), d) L. pantherinus (Zayas), holotype male. e) L. duartensis Lingafelter, new species, holotype male, dorsal. f) L. duartensis Lingafelter, new species, paratype female, ventral. g) L. duartensis Lingafelter, new species, paratype female, ventral view of sternites.

Figure 6. Distribution map of Luctithonus species known from Hispaniola.