Drycothaea indivisa, Nascimento, 2018

Nascimento, Francisco E. De L., 2018, New species, identification keys and notes on Lamiinae (Coleoptera, Cerambycidae) from the Neotropical region, Zootaxa 4457 (2), pp. 315-324 : 321-323

Drycothaea indivisa sp. nov.

( Figs 10–13 ).

Description, male. Integument mostly brownish; head, pronotum, elytral base and legs (except dark-brown coxae) reddish brown; clypeus and margin of labrum yellowish; antennomeres reddish brown on base, slightly darker toward apex (except III, entirely brownish); apex of mandibles, pro, meso- and metaventrite, and abdominal ventrites dark brown (except brownish abdominal ventrite V).

Head. Frons wider than long, with abundant yellowish pubescence nearly obscuring integument; with erect elongate setae of two color, yellowish and brownish; surface coarsely evenly punctate; antennal tubercles slightly, gradually elevated. Genae rounded at apex. Median groove distinct from clypeus to anterior margin of prothorax. Clypeus smooth and glabrous. Labrum scarcely yellowish pubescent; with semidecumbent, elongate yellowish setae interspersed. Mandibles strongly curved externally, triangularly depressed basally; with dense yellowish pubescence on depression and few semidecumbent elongate setae interspersed. Labial and maxillary palpomere IV fusiform; palpomeres with short, semidecumbent, elongate setae interspersed. Area of connection between lower and upper eye lobes narrowed, with three rows of ommatidia. Lower eye lobes about 2.5 times genal length; distance between lower eye lobes in frontal view about 2.5 times greater width of scape; upper eye lobes with seven rows of ommatidia; distance between upper eye lobes about twice width of an upper eye lobe; area between upper eye lobes coarsely punctate. Antennae reaching apical tenth of elytra. Scape gradually widened toward apex; with moderate yellowish pubescence not obscuring integument; with semi-erect elongated yellowish-brown and dark-brown setae interspersed. Pedicel with yellowish pubescence and row of semi-erect, elongated dark-brown setae on posterior half. Antennomeres with moderate yellowish pubescence, denser on base; inner side with decumbent, short dark setae and semi-erect, elongated dark-brown setae interspersed. Antennal formula (ratio) based on length of antennomere III: scape = 1.00; pedicel =0.10; IV = 0.80; V = 0.75; VI = 0.70; VII = 0.60; VIII =0.6; IX =0.50; X = 0.5; XI = 0.48.

Thorax. Prothorax about 1.4 times wider than long (including lateral tubercles); sides with acuminate tubercle placed at middle. Pronotum with three slightly raised tubercles, two circular, anterolateral, parallel-sided, and another elongate postmedian tubercle; surface coarsely punctate (except on pronotal tubercles); with abundant yellowish pubescence partially obscuring integument. Prosternum sparsely pubescent, pubescence gradually denser toward sides; with a few erect, elongate, thin yellowish setae interspersed; prosternal process about 0.2 procoxal cavity diameter. Procoxal cavity closed behind. Mesoventrite with pubescence as on prosternum; mesoventral process about half mesoventral cavity diameter, apex notched; metaventrite with pubescence as on prosternum and mesoventrite; mesanepisternum, mesepimeron, and metanepisternum with dense yellowish pubescence nearly obscuring integument. Scutellum about 1.5 times wider than long, with dense yellowish pubescence nearly obscuring integument; posterior margin slightly truncated. Elytra. About 4.0 times prothoracic length; gradually convergent toward apex; apex individually rounded; suture longitudinally sulcate from anterior third; with dorsally longitudinal carina starting near base, gradually less elevated toward posterior quarter, slightly and gradually convergent toward apex. Anterior half abundantly, coarsely, deeply punctate; punctures sparser and shallower toward apex. Humeral area with moderately dense yellowish pubescence not obscuring integument; remaining areas with yellowish-brown pubescence, interspersed with whitish pubescence (especially laterally); with semi–erected, elongate yellowish and brownish setae interspersed. Legs. Coxae scarcely yellowish pubescent; femora clavate, with moderately dense pale pubescence. Tibiae with scarce pale pubescence, with erect elongate yellowish-brown setae interspersed, denser on meso- and metatibiae. Pro- and mesotarsomere I as long as II + III; metatarsomere I slightly longer than II + III.

Abdomen. Surface with moderately densely pale pubescent; abdominal ventrites II–IV subequal length; V 1.4 longer than IV, apex rounded.

Dimensions (in mm), holotype male. Total length, 7.1; prothorax length, 1.4; greatest width of prothorax, 1.9; anterior width of prothorax, 1.3; posterior width of prothorax, 1.4; humeral width, 2.2; elytral length, 5.4.

Type material. Holotype male from MEXICO, Veracruz (16 K W. Snte compn [ Sontecomapan ]) 10-13, IV.1993. J.E. Wappes col. ( ACMT for deposit in FSCA).

Etymology. The name refers to the undivided tubercle of the mesoventrite.

Remarks. Drycothaea indivisa sp nov. is similar to D. anteochracea ( Breuning, 1974) by the dense yellowish pubescence on pronotum, contrasting with the elytral pubescence. The new species differs primarily by the mesoventral tubercle, not divided, elytra with sparse yellowish pubescence, interspersed with small areas of whitish pubescence, and by the narrower prosternal process ( Fig. 17 ). D. anteochracea has a conspicuous divided mesoventral tubercle, elytra has no small areas of whitish pubescence, and has a broader prosternal process ( Fig. 18 ). Additionally, D. anteochracea is recorded from French Guiana, Brazil and Bolivia, while the holotype of D. indivisa sp. nov. is known from Mexico (Veracruz).

Figures

FIGURES 10–16. 10–13, Drycothaea indivisa sp. nov., holotype, male: 10, dorsal view; 11, ventral view; 12, lateral view; 13, frontal view. 14–16, Drycothaea mexicana Breuning, 1974, holotype: 14, labels; 15, dorsal view; 16, ventral view.

FIGURES 17–18. Prosternum and the mesoventrite. 17, Drycothaea indivisa sp. nov.; 18, Drycothaea anteochracea (Breuning, 1974).