Corthylus ibarrai Atkinson, 2020

Atkinson, Thomas H., 2020, New species, new records and synonymy of Mexican Corthylus Erichson, 1834 (Coleoptera: Curculionidae: Scolytinae), Insecta Mundi 2020 (792), pp. 1-25 : 14-15

Corthylus ibarrai Atkinson , new species

Fig. 9 A, B ; Fig. 11 A–D

Diagnosis. In this species the circumdeclivital ring is only about 95% complete, with a slight notch along the midline. The ring itself is carinate and flat inside. The first interstriae on the declivity are costate in the mid area, diverging slightly from the midline posteriorly.

Female. Length: 2.14 mm, maximum width: 0.85 mm; length of elytra: 1.22 mm; length to width: 2.5; elytral length/total length: 0.57; elytral length/width: 1.44. (n = 5). Color, uniform black.

Frons evenly, deeply concave from epistoma to vertex. Central portion shining with sparse punctures associated with short setae. Longer setae present on lateral and dorsal margins, incurved but not obscuring any part of the frons; longest setae equal to width of eye. Area above epistoma with two patches of short, dense setae. Antenna subcircular, with first suture partly septate, second marked externally by a groove. Cirrus absent.

Anterior margin of pronotum slightly elevated with low asperities. Asperities on anterior portion of pronotum low, becoming obsolete at summit. Anterior portion of pronotal disc marked with low, transverse rugae, about the width of the asperities of the anterior slope. Posterior and lateral areas of disc with large punctures, separated by as distance subequal to their width; surface between punctures reticulate.

Elytral disc with strial and interstrial punctures more or less in rows, similar in size, confused near base. Elytra elongate, much longer than pronotum. Declivity abrupt, flattened, with an elevated circumdeclivital ring, about 95% complete, curving anteriorly near suture. Circumdeclivital elevation abruptly marginate, distinctly flattened on face of declivity. Interstriae 1 costate, serrate, not reaching lower margin, slightly divergent. Declivital face minutely reticulate, punctures large, separated by slightly more than their diameters, confused.

Male. Frons evenly convex, antennal club ovate. Similar to female in all other respects.

Type material. Holotype female. Mexico: Veracruz, El Santuario , campus INECOL, 1-IX-2015, bottle trap with ethanol, L.A. Ibarra ( CNIN) . Allotype male. Same data except different date ( CNIN) . Paratypes. Same data, different dates 2015–2016 ( UTIC,1, IEXA, 1, USNM, 2) ; Chiapas: Unión Juárez , 15.0817 N, 92.0783 W, 1450 m, 5-XII-2013, F. Infante ( UTIC, 1) .

Etymology. The name was chosen to reflect the contributions of Luís Arturo Ibarra J. who was the first to collect this and two other species described in this paper.

Figures

Figure 9. Mexican and Central American species with truncate declivity (1 of 2). A, B) C. ibarrai new species, holotype. C, D) Holotype, C. serratus Wood. E, F) C. latisetosus new species, holotype. G, H) C. burgosi new species, holotype. I, J) C. mexicanus Schedl. Photographs A–B, E–J by the author, C–D by S.M. Smith (Copyright National Museum of Natural History, Smithsonian Institution, Washington, D.C., published by permission).

Figure 11. Corthylus ibarrai, new species, female holotype.A) Dorsal habitus.B) Lateral habitus.C) Frons and antenna. D) Declivity. All photographs by the author.