Amasa beesoni (Eggers, 1930)

Sittichaya, Wisut, Smith, Sarah M. & Beaver, Roger A., 2019, Ten newly recorded species of xyleborine ambrosia beetles (Coleoptera, Curculionidae, Scolytinae, Xyleborini) from Thailand, ZooKeys 862, pp. 109-127 : 111

Amasa beesoni (Eggers, 1930) Fig. 2 A–F

Pseudoxyleborus beesoni Eggers 1930: 207.

Amasa beesoni (Eggers): Wood 1984: 223.

Diagnosis.

Large, 4.60−4.79 mm (N = 2) long; stout, 2.0−2.1 times longer than wide; body smooth, shining nearly glabrous, yellowish brown to dark brown in color; eye completely divided; antennal club with sutures obscured (type 5; Hulcr et al. 2007); pronotum from dorsal view rounded (type 1; Hulcr et al. 2007), anterior margin broadly round, anterior half finely asperate, 1.1 times wider than long; elytra 1.1 times longer than pronotum, elytral disc punctures very fine, confused, never seriate, lateral sides subparallel, widest on declivital summit, declivital summit at first interstriae bearing a pair of small flattened teeth, declivital face shining, striae impressed, interstriae finely, densely punctate.

Material examined.

THAILAND, Khao Lak-Lam Ru National Park, Phang Nga Province, 8°39'22.4"N 98°17'31.6"E, tropical rainforest, ethanol-baited trap, 01.v.2015 (1), 01.iv.2015 (1), (W. Sittichaya).

Distribution.

Indonesia, Malaysia, Myanmar. New to Thailand.

Biology.

Recorded from Dimocarpus longan Lour and Xerospermum intermedium Radlk. ( Sapindaceae ) and possibly with a fixed association with this family ( Browne 1961). The gallery system, as in other Amasa species, comprises a short radial tunnel leading to a single, large, flat brood chamber, extending in the longitudinal plane ( Browne 1961).

Remarks.

This species can be distinguished from all other Amasa recorded in Thailand by the completely divided eye and the small teeth at the apex of the elytral disc on the first interstriae.

Figures

Figure 2. Amasa beesoni (Eggers, 1930) A lateral view B dorsal view C posterolateral view D antenna E front F declivity.