87. Diuncus javanus (Eggers) *

Xyleborus javanus Eggers, 1923: 188 .

Diuncus javanus (Eggers): Hulcr & Cognato 2009: 32.

Thai distribution: C: Nakhon Nayok; N: Phetchabun; S: Chumphon, Nakhon Sri Thammarat, Surat Thani. New to Thailand.

New records: Chumphon, Thung Tako Distr., 10° 02' 21.8'' N, 98° 59' 13.5'' E, 107 m, durian plantation, EtOH trap, 1.i.2010 (W. Sittichaya) (2); Nakhon Nayok, Khao Yai NP, Lam Takong view point, 14° 25.82' N, 101° 23.754' E, 744 m, MT, 5–12.x.2006 (W. Sook-kho) (1); as previous except: Valley at entrance of Huay Pak Chee, 14° 27.115' N, 101° 21.951' E, 733 m, 19–26.xi., 26.xi.–3.xii.2006 (2); Nakhon Sri Thammarat, Chang Klang Distr., 08° 21' 33.7'' N, 99° 39' 02.9'' E, 60 m, Durian plantation, EtOH trap, 1.ix.2009 (W. Sittichaya) (4); Khao Luang NP, headquarters, 08° 22' 21.6'' N, 99° 44' 14.7'' E, 196 m, EtOH trap, 1.iii.2010 (W. Sittichaya) (4); Namtok Yong NP, 8° 10.434' N, 99° 44.508' E, 80 m, MT, 16–23.ix.2008 (U-prai, K.) (1); Phetchabun, Thung Salaeng Luang NP, Kaeng Wang Nam Yen, 16° 36.587' N, 100° 53.395' E, MT,16–22.xi., 22–29.xi.2006 [no collector] (2); Surat Thani, Rajaprapa reservoir, ex cut liane, 24.ii.2012 (R. A. Beaver) (1) .

Other distribution: Indonesia (Java, Sumatera), Malaysia (E. & W.). Intercepted in Japan in timber from the region. The species also occurs in Brunei Darussalam, Indonesia (Sulawesi), and the Philippines (R. A. Beaver, unpublished records). (3)

Biology: Polyphagous (Kalshoven 1959, Browne 1961a). It attacks both small branches and larger logs. The form of the gallery system depends on the size of the breeding material, but branches in three dimensions, and has no distinct brood chambers (Browne 1961a). A sex ratio of 1♂: 10.4 ♀ is recorded by Kalshoven (1959).

Illustrations: D (Nunberg 1959 as Xyleborus javanus).