Debus emarginatus (Eichhoff, 1878)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Debus emarginatus (Eichhoff, 1878) Fig. 48A, B, I

Xyleborus emarginatus Eichhoff, 1878a: 392.

Debus emarginatus (Eichhoff): Hulcr and Cognato 2010a: 14.

Xyleborus exesus Blandford, 1894b: 119. Synonymy: Hulcr 2010: 111.

Ips cinchonae Veen, 1897: 135. Synonymy: Kalshoven 1959a: 96.

Xyleborus cordatus Hagedorn, 1910a: 12. Synonymy: Schedl 1942c: 6.

Xyleborus palmeri Hopkins, 1915a: 54. Synonymy: Hulcr 2010: 111.

Xyleborus terminaliae Hopkins, 1915a: 54. Synonymy: Hulcr 2010: 110.

Xyleborus emarginatus semicircularis Schedl, 1973: 92. Synonymy: Wood 1989: 176.

Type material.

Syntype Xyleborus emarginatus (MIZ). Syntypes Xyleborus exesus (NHMUK, 2). Holotype Xyleborus palmeri (NMNH). Holotype Xyleborus terminaliae (NMNH).

New records.

China: N Guangxi reg., Miaoershan, S slope, 1300-2000 m, 25-28.vi.1997, Bolm (RABC, 1).

Diagnosis.

3.3-3.6 mm long (mean = 3.48 mm; n = 4); 2.83-3.0 × as long as wide. This species is distinguished by the posterolateral extensions of elytra short, less than the width of apical emargination, and declivity shallowly excavated; declivity clearly, confusedly punctate.

This species is very similar to D. shoreae and is distinguished by the punctation of the declivity.

Similar species.

Debus quadrispinus , D. shoreae .

Distribution.

From India and southern China through southeast Asia, the Philippines and Indonesia to New Guinea and the Solomon Islands in the East, northwards to Japan. Recorded in the study region from China (Fujian, Guangxi*, Guizhou, Hubei, Hunan, Shaanxi, Shanxi, Sichuan, Xizang, Yunnan), India (Nicobar Is), Laos, Taiwan, Thailand, Vietnam.

Host plants.

Strongly polyphagous (e.g., Browne 1961b; Ohno 1990; Wood and Bright 1992).

Remarks.

Browne (1961b) provides further information on the habits of the species.

Figures

Figure 48. Dorsal, lateral and declivital view of Debus emarginatus, 3.3 - 3.6 mm (A, B, I), D. pumilus, 2.5 - 3.2 mm (C, D, J), D. quadrispinus, 2.2 - 2.5 mm (E, F, K), and D. shoreae, 3.0 - 3.8 mm (G, H, L).