Chaetophloeus

Atkinson, Thomas H., 2024, New species, new synonymy, taxonomic notes and new records of bark and ambrosia beetles from the southwestern United States and northern Mexico (Coleoptera: Curculionidae: Platypodinae and Scolytinae), Zootaxa 5424 (2), pp. 151-175 : 156

Modification of key ( Wood 1982 key) to Chaetophloeus of North and Central America

The text in Wood’s couplets has been extensively re-arranged and paraphrased, such that it is not possible to identify his original text.

7 (6) Declivity clearly sulcate with interstriae 3 elevated; submarginal crenulations on elytral bases entirely absent ( Fig. 1 A,E , Fig. 3 A,E ); declivital sulcus poorly developed (Fig, 1D, H, Fig. 3 D,H )..............................................7’

- Declivity flattened or rounded, interstriae 3 not notably elevated; one pair of small submarginal crenulations present at base of interstriae 2 ( Fig. 4 A,E ); declivital interstriae 2 more strongly impressed, 3 weakly but distinctly elevated at least apically ( Fig. 4 D,H ); small patches of light scales irregularly scattered on pronotum and elytra; erect interstrial scales less than three times as long as wide; Hidalgo; Hosts composite shrubs in xeric habitats; 1.6–2.0 mm........................ sulcatus (Wood)

7’ (7) Basal crenulations 1–3 slight offset posteriorly with respect to others; scales predominantly dark brown and beige; basal half of pronotum with a continuous row of beige scales; anterior half with predominantly brown; scales on elytra with odd numbered interstriae mainly pale, dark on even numbered interstriae, suggesting rows ( Fig. 3 A,E ). In Rosaceae , from northern Mexico to Manitoba............................................................................. heterodoxus (Casey)

- Basal crenulations 1–3 in line with others; scales predominantly light brown and white; basal fourth of pronotum with a continuous row of brown scales; anterior ¾ with irregular mix of white and brown; scales on elytra with irregular mix of light and dark scales, not suggesting rows ( Fig. 1 A,E ). In composite shrubs ( Flourensia ) in Chihuahuan Desert.................................................................................................. flourensiae Atkinson

Figures

FIGURE 1. Chaeotophloeus flourensiae. Male holotype (USNMENT01547792): (A) Dorsal, (B) Lateral, (C) Frontal, (D) Posterior.Female allotype (USNMENT01547793):(E) Dorsal, (F) Lateral, (G) Frontal, (H) Posterior. Specimen data:Texas: Jeff Davis Co., Springhills, I-10 exit 184, 31.8228 N, 104.1025 W, 1,238 m, 18-III-2016, T.H. Atkinson (USNM). All photographs by the author.

FIGURE 3. Chaeotophloeus heterodoxus. Male: (A) Dorsal, (B) Lateral, (C) Frontal, (D) Posterior. Female: (E) Dorsal, (F) Lateral, (G) Frontal, (H) Posterior. Specimen data: Mexico: Baja California, Col. Lázaro Cárdenas, 10 km W, 31.3573 N, 115.8275 W, 846 m, 11-XI-2105, ex Prunus ilicifolia, T.H. Atkinson (UTIC). All photographs by the author.

FIGURE 4. Chaeotophloeus sulcatus. Male holotype: (A) Dorsal, (B) Lateral, (C) Frontal, (D) Posterior. Female holotype: (E) Dorsal, (F) Lateral, (G) Frontal, (H) Posterior. Specimen Data: (A–D) Mexico: Hidalgo, Ixmiquilpan, [20.4830 N, 99.2330 W], 1,615 m, 23-VI-1953, S.L. Wood (SEMC); (E–H) Mexico: Coahuila: Saltillo, 25.3451 N, 101.0289 W, 17-V-2015, ex Gochnatia hypoleuca, T.H. Atkinson (UTIC). All photographs by the author.