Cacostola howdenae Wappes and Santos-Silva, 2019

Wappes, James E. & Santos-Silva, Antonio, 2019, New species and taxonomic notes for Cacostola Fairmaire and Germain, 1859 (Coleoptera: Cerambycidae: Lamiinae: Onciderini), Insecta Mundi 741 (741), pp. 1-20 : 7-8

Cacostola howdenae Wappes and Santos-Silva , new species

( Fig. 20–23 )

Description. Male. Integument mostly dark brown; anteclypeus and labrum reddish-brown; apex of last palpomeres yellowish-brown; basal half of antennomere IV, and basal third of antennomere V reddish-brown; basal 2/3 of antennomere VI yellowish-brown; antennomeres VIII–X yellowish-brown, except narrow dark brown apex; antennomere XI yellowish-brown; elytra with wide dark reddish-brown band dorsally, oblique from humerus to near middle, then narrowed, following parallel to suture and gradually disappearing toward distal quarter; trochanteres reddish-brown; basal third of tibiae dark reddish-brown (less so depending on light intensity); tarsomere V dark reddish-brown, apex dark brown.

Head. Frons finely, moderately abundantly punctate; with yellowish-brown pubescence not obscuring integument, slightly denser laterally and centrally along superior area of median groove, with short white setae interspersed. Vertex with sculpturing as on frons; with dense yellowish-brown pubescence between antennal tubercles, close to upper eye lobes and centrally, remaining surface brown, with short white setae interspersed. Area behind upper eye lobes with sculpturing as on vertex; with dense yellowish-brown pubescence close to superior area of eye, with short white setae interspersed, brown, nearly obscuring integument on remaining surface. Area behind lower eye lobes with sculpturing as on vertex; with dense yellowish-brown pubescence, with short white setae interspersed on superior area close to eye and posterior area close to prothorax; remaining surface with sparse yellowish-brown pubescence and short white setae interspersed. Genae 0.7 times length of lower eye lobe; with sculpturing as on frons, distal area smooth; with sparse yellowish-brown pubescence and short white setae interspersed. Antennal tubercles with inner projection distinctly elevated, narrow; together, in frontal view, U-shaped; sculpturing as on frons basally, minutely punctate on remaining surface; with yellowishbrown pubescence not obscuring integument and short white setae interspersed. Wide central area of postclypeus with sculpturing and pubescence as on frons, smooth, glabrous laterally. Labrum with sparse yellowish-white pubescence close to anteclypeus, slightly denser, with white setae interspersed on anterior area. Mandibles with moderately sparse yellowish-brown pubescence on basal 2/3 of outer surface. Distance between upper eye lobes 0.34 times length of scape; in frontal view, distance between lower eye lobes 0.76 times length of scape. Antennae 2.1 times elytral length, reaching elytral apex about middle of antennomere VII. Scape with sparse yellowish-brown pubescence, slightly denser basally and short white setae interspersed. Pedicel with sparse yellowish-brown and yellowish-white pubescence basally, remaining surface brown. Antennomere III with yellowish-white pubescence on basal third, remaining surface brown; antennomeres IV–VI, with yellowish-white pubescence on light area, brown on dark area; antennomere VII with sparse yellowish-white pubescent maculae; antennomeres VIII–XI with yellowish-white pubescence; pedicel and antennomeres III–VIII with long, erect, thick dark setae ventrally. Antennal formula (ratio) based on length of antennomere III: scape = 0.72; pedicel = 0.15; IV = 1.25; V = 1.12; VI = 1.00; VII = 0.87; VIII = 0.80; IX = 0.67; X = 0.65; XI = 0.80.

Thorax. Prothorax wider than long; sides with distinct rounded tubercle from about middle to posterior constriction. Pronotum coarsely, sparsely punctate; transversely rugose centrally, from about anterior constriction to middle; with white pubescent band centrally on posterior quarter, surrounded by yellowish-brown pubescence; white pubescent on center of posterior margin; with moderately dense yellowish-brown and white pubescence mixed laterally; sparse yellowish-brown pubescence anteriorly and short white setae interspersed; remaining surface with brown pubescence not obscuring integument, with short white setae interspersed. Sides of prothorax with sculpturing as on pronotum; with yellowishbrown pubescence, denser toward prosternum and with short white setae interspersed. Prosternum with dense yellowish-brown pubescence laterally, with white setae interspersed, distinctly sparser centrally. Prosternal process with yellowish-brown pubescence, with white pubescence interspersed, slightly denser than on central area of prosternum; narrowest area of prosternal process about 0.2 times width of procoxal cavity. Mesanepisternum, mesepimeron, sides of mesoventrite, and base of metanepisternum with dense yellowish-brown pubescence; central area of mesoventrite with yellowish-brown pubescence, with white pubescence interspersed; remaining surface of metanepisternum and metaventrite with brownish pubescence not obscuring integument (distinctly sparser on posterocentral area of metaventrite), except sparse yellowish-brown pubescence on metaventrite close to meso- and metacoxae. Scutellum with sparse yellowish-brown pubescence. Elytra. Humeri slightly projected; sides slightly convergent from humeri to middle, parallel-sided from middle to distal sixth, then gradually narrowed toward rounded apex; with two moderately elevated carina from base to near apex, fused posteriorly; sides of posterior sixth depressed in relation to the dorsal surface; with white pubescent band dorsally, from base to posterior sixth, fused with another white pubescent band, also dorsally, from after middle to near apex; sides of dorsal surface with yellowish-brown and white pubescence mixed on anterior third; area between white pubescent band and suture with yellowish-brown pubescence not obscuring integument, except white pubescent band close to suture on about central third; inclined area with sparse yellowish-brown pubescence basally and about middle; remaining dorsal surface with brown pubescence not obscuring integument, sparse yellowish-brown pubescent laterally from middle. Legs. With yellowish-brown pubescence not obscuring integument; meso- and metatibiae tumid, especially the latter.

Abdomen. Ventrites with yellowish-white pubescence, denser laterally, yellower on ventrite V. Apex of ventrite V slightly concave.

Dimensions (mm). Total length, 10.00; prothoracic length, 1.35; anterior prothoracic width, 1.55; posterior prothoracic width, 1.60; maximum prothoracic width, 1.75; humeral width, 2.50; elytral length, 7.50.

Type material. Holotype male from GUATEMALA, Guatemala: 14.5 km SE Guatemala City, Puerta Parada , 1790 m, 13.VI.1991, A. Howden col. ( FSCA, formerly ACMT).

Remarks. Cacostola howdenae sp. nov. is similar to C. mexicana (Breuning, 1943) . As we do not know the sex of the holotype of C. mexicana , it is not possible to provide a detailed comparison, but the new species at least differs as follows: elytra more distinctly narrowed toward apex, which is also narrower, and not widened after middle; distance between upper eye lobes smaller, distinctly shorter than 1/3 of the basal width of the prothorax (equal to 1/3 of basal width of the prothorax in C. mexicana ).

Etymology. Named for Anne Howden (now deceased), a wonderful lady and the collector of the holotype.

Figures

Figures 20–27. Cacostola spp. 20–23) Cacostola howdenae, holotype male. 20) Dorsal habitus. 21) Ventral habitus. 22) Lateral habitus. 23) Head, frontal view. 24–27) Cacostola thomasorum, holotype male. 24) Dorsal habitus. 25) Ventral habitus. 26) Lateral habitus. 27) Head, frontal view.