Rhoenanthus (Rhoenanthus) distafurcus Bae & McCafferty, 1991

Figures 10E, 11D, 14, 15

Materials examined.

1 larva, Thailand, Kanchanaburi province, Sai Yok district, Pueng Wahn Resort, 14°12'08.9"N, 99°03'36.0"E, 15.X.2015, B. Boonsoong leg ; 2 larvae, Ratchaburi province, Suan Phueng district, Pha Chi river, 13°30'57.3"N, 99°20'40.1"E, 19.IX.2016, B. Boonsoong leg ; 1 larva, Nan province, Bo Kluea district, Sapan waterfall, 19°11'25.8"N, 101°11'56.3"E, 800 m, 28.XI.2020, B. Boonsoong leg.

Diagnosis.

The larvae of Rhoennanthus distafurcus can be distinguished from those of other Rhoenanthus (Rhoenanthus) species based on the following characteristics: i) subapical spine of the mandibular tusk well developed laterally (Fig. 10E), with a simple, short spine, ii) 16-20 medial rounded setae on mandibular tusk (Fig. 10E) iii) length of the mandibular tusks ca 1.7-1.9 × length of head, iv) length of foretibiae ca 1.19-1.25 × length of the forefemora and about 2.5-2.8 × length of the foretarsi, (v) leg with colour marking as in Fig. 11D, and vi) lack of bipectinated setae on the mandible (Soldan T and Putz M 2000).

Distribution.

Kanchanaburi, Ratchaburi, and Nan provinces.

Remark.

Bae and McCafferty (1991) described R. distafurcus based on imaginal specimens from Thailand, India, and Vietnam. The larva of R. distafurcus was described by Soldan T and Putz M (2000) based on specimens from Vietnam. In Thailand, a male adult of this species was found in Khao Yai National Park (Bae and McCafferty 1991). In the present study, larval specimens of this species were found in western and northern Thailand.