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Abstract: Two new species of Allobethylus are described and illustrated. Allobethylus korystus sp. nov. from Thailand is characterized as having a mandible with four apical teeth, a clypeus with a trapezoidal frontal profile and a pronotal declivity with a conspicuous crest. The last two traits are new characteristics to the genus. Allobethylus lamprus sp. nov. from Myanmar is characterized as having a mandible with three apical teeth, a clypeus with a triangular frontal profile and a bidentate median lobe. Additionally, A. multicolor Kieffer is recorded for the first time from Thailand. An updated world key to the species of genus is also provided. [Copyright &y& Elsevier]

Caloapenesia Terayama is characterized by having the costal cell very long, the stigma of forewing absent, and the paramere deeply divided into two arms. Three species of this genus were known from Oriental Region. Sixteen new species from Indonesia, Thailand and Vietnam: C. ana sp. nov., C. arbeni sp. nov., C. diba sp. nov., C. edas sp. nov., C. heira sp. nov., C. inyara sp. nov., C. jailuna sp. nov., C. lani sp. nov., C. launeci sp. nov., C. leptata sp. nov., C. mugra sp. nov., C. nadaili sp. nov., C. paruwa sp. nov., C. rikawa sp. nov., C. sabeli sp. nov. and C. supra sp. nov. are described and illustrated. A character list for delimiting species and comments about generic male characters as a key to males are given.

The Thai Dissomphalus classification is reviewed, and 29 species are recognized. Previously described species, D. browni Terayama, D. chiangmaiensis Terayama, and D. thaianus Terayama had their known distribution and taxonomic variations broadened. Dissomphalus wusheanus Terayama is newly recorded from Thailand. Twenty-four new species, D. epitus Mugrabi & Azevedo, sp. nov., D. verus Mugrabi & Azevedo, sp. nov., D. prilus Mugrabi & Azevedo, sp. nov.,D. daneus Mugrabi & Azevedo, sp. nov., D. gabrus Mugrabi & Azevedo, sp. nov., D. gionus Mugrabi & Azevedo, sp. nov., D. cherrus Mugrabi & Azevedo, sp. nov., D. julius Mugrabi & Azevedo, sp. nov., D. davus Mugrabi & Azevedo, sp. nov., D. zethus Mugrabi & Azevedo, sp. nov., D. hetus Mugrabi & Azevedo, sp. nov., D. joelus Mugrabi & Azevedo, sp. nov., D. nandus Mugrabi & Azevedo, sp. nov., D. jubus Mugrabi & Azevedo, sp. nov., D. kelsus Mugrabi & Azevedo, sp. nov., D. turinus Mugrabi & Azevedo, sp. nov., D. paulus Mugrabi & Azevedo, sp. nov., D. barbus Mugrabi & Azevedo, sp. nov., D. robus Mugrabi & Azevedo, sp. nov., D. geanus Mugrabi & Azevedo, sp. nov., D. magnetus Mugrabi & Azevedo, sp. nov., D. lidinus Mugrabi & Azevedo, sp. nov., D. mugrus Mugrabi & Azevedo, sp. nov. and D. ferrerus Mugrabi & Azevedo, sp. nov., are described and illustrated. A key to the males of Dissomphalus from the Oriental region is provided.