Leptocometes longilineatus, Nascimento & Mcclarin, 2018

Nascimento, Francisco E. De L. & Mcclarin, Jim, 2018, New species of Acanthocinini Blanchard, 1845 (Coleoptera, Cerambycidae, Lamiinae) from Ecuador and notes on Parabaryssinus lineaticollis (Gounelle, 1910), Zootaxa 4387 (2), pp. 385-393 : 389-390

Leptocometes longilineatus sp. nov.

( Figs 11–15 )

Holotype male. Integument mostly reddish brown; mouthparts, gulamentum, peduncle of femora, band on basal half of tibiae and metatarsomere I yellowish; mandibles dark brown toward apex; flagellomeres with whitish basal ring.

Head: Frons with abundant yellowish pubescence not obscuring integument. Genae elongate, length subequal to length of a lower eye lobe. Median groove extending toward area between upper eye lobes. Antennal tubercles slightly and gradually elevated from median groove. Gulamentum glabrous. Upper eye lobes with six rows of ommatidia; distance between upper eye lobes about three times width of an upper eye lobe. Antennae as long as 1.5 times body length, reaching elytral apex at midlength of antennomere VIII; scape and base of antennomere III with abundant yellowish pubescence not obscuring integument; base of the antennomeres IV–VII with whitish ring; internal side of flagellomeres with erect and thickened setae, as long as respective antennomere diameter. Antennal formula (ratio) based on length of antennomere III: scape = 0.98; pedicel = 0.10; IV = 0.82; V = 0.65; VI = 0.55; VII = 0.57; VIII = 0.60; IX = 0.60; X = 0.60; XI = 0.55.

Thorax: Prothorax 1.4 wider than long; sides with tubercle widened at base and acuminate at apex. Anterior margin of pronotum 1.05 times wider than posterior margin, with remarkably transverse sulcus basally; posterior margin with sinuous sulcus converging at median margin. Pronotum deeply punctate; transverse row of punctures parallel to the posterior sulcus; disc with two median longitudinal lines of dark brown pubescence, close to each other toward anterior and posterior margins and wider at posterior half with some punctures sparsely distributed laterally and sets of three punctures close to anterior margin each side of disc. Prosternum, meso- and metaventrite with yellowish pubescence not obscuring integument. Prosternal process about one-third as wide as procoxal cavity; procoxal cavity laterally angular and closed behind; mesoventral process about one-third diameter of a mesocoxal cavity, open laterally. Metathoracic discrimen reaching metaventral process. Elytra 4.1 times length of prothorax; sides slightly convex; narrowed at apical third; centrobasal crest elongate; elytral surface deeply and homogeneously punctate, irregularly distributed; erect dark setae sparsely distributed; with distinct lateral carina and two dorsal carinae, confluent at apical quarter, external carina starting at humeral angle and internal slightly oblique, starting at basal third near external carina, convergent posteriorly toward suture; apex obliquely truncate; outer angle triangularly projected; elytral pubescence as follows: yellowish brown pubescence on circum-scutellar area, followed by wide, oblique dark brown pubescent band from humerus to suture, darker on area of crest; with sub-triangular pale yellow pubescent spot close to anterior dark brown band, from suture to about middle of dorsal surface; remaining surface with cream pubescence interposed with brownish, irregular pubescent maculae (cream pubescence forming distinct band on distal third along suture).

Legs: Coxae and femora with short and abundant yellowish pubescence not obscuring integument. Femora pedunculate and clavate. Tibiae slightly widened toward apex; protibiae slightly curved at apical half; external margin of apical half of mesotibiae with tuft of thickened semi-erect black setae followed by depression; apical half of metatibiae with thickened semi-erect black setae.

Abdomen: Ventrites I–IV subequal in length; V about 1.5 times length of IV, emarginated at apical margin; with short and abundant yellowish pubescence not obscuring integument.

Dimensions (in mm), Holotype male. Total length, 6.4; prothorax length, 1.1; greatest width of prothorax, 1.5; anterior width of prothorax, 1.1; posterior width of prothorax, 1.3; humeral width, 2.2; elytral length 4.6.

Type material. Holotype male from ECUADOR, Napo: Cosanga , 2100m, 2015-XI-5 J. McClarin leg. ( QCAZ).

Etymology. The name refers to the longitudinal lines of dark brown pubescence of the pronotum.

Remarks. Monné (1990) differentiated Leptocometes from Onalcidion Thomson, 1864 by the central or only post-median position of the lateral tubercles of the prothorax. In Onalcidion , the tubercles are slightly elevated and located near the posterior lateral margin. Leptocometes longilineatus sp. nov. differs from its congeneric species especially by its pronotal disc having two median longitudinal lines of dark brown pubescence ( Fig. 15 ), and by elytral color and pubescence pattern (fig. 11).

Figures

FIGURES 11–15. Leptocometes longilineatus sp. nov., holotype, male:11, dorsal view; 12, ventral view; 13, lateral view; 14, frontal view; 15, pronotum.