Chaetophloeus woodi Burgos and Atkinson, 2022

Burgos-Solorio, Armando & Atkinson, Thomas H., 2022, New species and new records of Chaetophloeus LeConte (Coleoptera: Curculionidae: Scolytinae) from Mexico, Zootaxa 5174 (1), pp. 73-84 : 77-79

Chaetophloeus woodi Burgos and Atkinson , sp. nov.

(Figs, 4 A–E, 5 A–D, 6 A–E, 8C)

Diagnosis. This species would come out to couplet 11 in Wood’s (1982) key to North and Central American Chaetophloeus , but would go no further. There is a superficial similarity with C. mexicanus in that both have mottled setal patterns, but the two species are easily distinguishable. In C. mexicanus the vestiture on the pronotum and elytra is denser and clearly forms irregular shapes of light and dark scales. In C. woodi darker scales predominate. The erect, long interstrial scales on the declivity are not found in C. mexicanus . These erect, long interstrial setae are longer and almost acuminate in some specimens ( Fig. 5 ).

Male. Color dark-brown, total length 1.86 mm (1.45–1.86), width 0.98 mm (0.83–1.02), length/width = 0.53 mm (0.51–0.57) (n= 10).

Head. Frons deeply, transversely impressed above epistoma, less strongly concave to vertex. Epistomal margin weakly, evenly procurved, and distinctly elevated, with small anterior projection in center. Center of concavity punctured with erect, pointed setae; these much denser and longer along lateral margins; setae on lateral periphery mostly yellow, mostly brown in center

Antennal. club elongate, with three segments; sutures poorly marked, indicated by yellow setae on sides of the club.

Pronotum. Wider than long, sides tapering gradually towards anterior margin without obvious constriction. Posterior margin nearly straight, only slightly sinuate. Plueral areas with white, recumbent, bifid setae. Dorsal surface with dense, deep punctures, almost contiguous. Vestiture of mixed brownish, elongate, recumbent setae and much paler, erect, rounded scales; erect setae on anterior margin longer.

Elytra. Anterior margins of elytra slightly procurved, with erect crenulations on margin, with submarginal crenulations on interstriae 1 and 2, pale, with bifid setae on anterior margin of crenulations, a single broad scale on the posterior of each. Striae marked with large, closely spaced punctures, not impressed, with brown, recumbent narrow setae. Interstriae about 2x the width of striae, vestiture of erect, scale-like setae in the middle, with slightly confused, narrow recumbent setae on either side. Erect interstrial scales spaced by several times their length on the disc, becoming more closely spaced and longer towards the declivity (3x–4x width of interstriae). Declivity concave, with interstriae 1 slightly deeper than others, interstriae 2 not impressed. Vestiture similar to that on pronotum except for longer, interstrial setae.

Sternum. All ventrites are covered with elongate, bifid setae, becoming shorter and darker posteriorly. Ventrites 5 with a slight concavity in the center.

Female. Length 1.79 mm (1.45–1.89), width 0.96 mm (0.82–0.98), length/width 0.54 mm (0.49–0.55) (n=10). Similar to the male with the following differences.

Head. Frons flattened between eyes, densely punctured with blunt, flattened setae, similar in size over the entire area. Epistomal margin not elevated, but with blunt anterior projection.

Pronotum. Anterolateral area with several oblique rows of erect, chisel-like teeth, these barely longer than the vestiture.

Sternum. Ventrite 5 with distinct tuft of setae.

Type Material. Holotype male ( CNIN), Mexico, Puebla: San Lucas Teteletitlán, Atexcal , 18.3648 N, 97.6267 W, 23-VII-2014, 2120 m, Eysenhardtia sp. , A. Burgos AB-2100 . Allotype female ( CNIN), same data. Paratypes: same data ( CEUM, 20); San Isidro Atexcoco, 18.2064 N, 97.5563 W, 2120 m, 30-XII-2015, Eysenhardtia sp. , A. Burgos, E. Burgos & R. Tapia, AB-2504, ( CEUM, 8); Hidalgo: Pachuca, 21-V-1982, 2400, Eysenhardtia sp. , A. Equihua M ( TAMU, 15, ( CEAM, 3); Oaxaca, Monte Albán, 19-X-1987, in legume branches, A. Burgos ( TAMU, 6); Textlihuaca, 6 km NW, Carr. 135; 1906 m, 17.33194 N, - 96.9363 W, 22-X-2011, Eysenhardtia polystachya, T.H. Atkinson, T. H. , ( UTIC, 4; TAMU; 4; CEAM, 10; USNM, 4).

Etymology. This species is named in honor of Stephen L. Wood, for his important contribution to the knowledge of the Scolytinae of Mexico and the world.

Biology and distribution. This species has been found in the states of Hidalgo, Puebla, and Oaxaca in arid and semi-arid woodlands. It has been collected from Eysenhardtia polystachya (Ortega) Sarg. in branches ranging from 1–3 cm in diameter. The main parental gallery is roughly oval, with 2–4 short ovipositional galleries oriented in different directions. In some cases, it was collected from the same branches as C. mexicanus . On close examination the two species are easily distinguishable, though both have mottled setal patterns, and the presence of C. woodi was overlooked in older collections ( Fig. 5 ).

Figures

FIGURE 5. Dorsal (A), lateral (B), frontal (C), and posterior (D) views of a male paratype of Chaetophloeus woodi. All photographs by A. Burgos S.