Cyclorhipidion, Hagedorn, 1912

Hoebeke, E. Richard, Rabaglia, Robert J., Knížek, Miloš & Weaver, John S., 2018, First records of Cyclorhipidion fukiense (Eggers) (Coleoptera: Curculionidae: Scolytinae: Xyleborini), an ambrosia beetle native to Asia, in North America, Zootaxa 4394 (2), pp. 243-250 : 248

Key to female Cyclorhipidion occurring in North America

1 Body length short, 1.82–2.16 mm; elytra pale yellowish brown ( Figs. 1 , 2 ); elytral declivity dull, almost flat, not impressed between interstriae 1 and 3; pronotum longer than wide (pronotal length/width ratio = 1.17–1.25); declivital strial punctures large, shallow, distinct, with interior surfaces reticulate, separated by less than their diameter, and denticles on declivital interstriae 1 and 3 small and more or less uniform in size ( Fig.5 )..................................... bodoanum (Reitter)

- Body length large, more than 2.4 mm; elytra chestnut brown to blackish brown; elytral declivity shining, impressed between interstriae 1 and 3; pronotum only slightly longer than wide or nearly quadrate (pronotal length/width ratio ± 1.17); declivital strial punctures smaller and reticulate, generally separated at least by their diameter or slightly more; denticles on declivital interstriae 1 and 3 larger than others...................................................................... 2

2 Body length 2.45–2.76 mm; declivital interstriae 2 slightly impressed ( Fig. 6 ); elytra chestnut-brown; strial punctures and interstrial punctures on elytral declivity of equal size, confused ( Fig. 6 ); pronotal length/width ratio = 1.07–1.17.................................................................................................. fukiense (Eggers)

- Body length 3.07–3.36 mm; declivital interstriae 2 noticeably impressed ( Fig. 7 ); elytra blackish-brown; strial punctures on elytral declivity clearly distinct and larger than interstrial punctures, distinctly seriate ( Fig. 7 ); pronotal length/width ratio = 1.06–1.16.......................................................................... pelliculosum (Eichhoff)

Figures

FIGURE 1. Comparison of relative lengths of Cyclorhipidion bodoanum, C.fukiense, and C.pelliculosum.

FIGURES 2–4. Cyclorhipidion species, lateral views.2. C. bodoanum. 3. C.fukiense. 4. C. pelliculosum.

FIGURES 5–7. Cyclorhipidion species, oblique views of declivity.5. C. bodoanum. 6. C. fukiense. 7. C.pelliculosum.