Genus Microlithosia (Lepidoptera, Erebidae, Arctiinae) in Laos, with the description of a new species Author Bayarsaikhan, Ulziijargal Author Lee, Dong-June Author Bae, Yang-Seop text Zootaxa 2018 4420 4 502 508 journal article 29158 10.11646/zootaxa.4420.4.3 45d116e6-543a-4b1b-9e4c-6a09146d4b5d 1175-5326 1455403 7299367F-C279-40CA-88C4-B3A95842F95C Microlithosia laosana Bayarsaikhan & Bae , n. sp. ( Figs. 1 , 4 ) Type materials. Holotype : 1 ♂ , Laos , Prov. Xieng Khouang , Ban Tha (N19˚43′0.70″, E103˚35′24.20″, Alt : 1204 m ), 30.VI.2017 (Y.S. Bae, S.M. Na, D.J. Lee, J.H. Ko and T.K. Lee), Gen. Slide No. INU ˗1846L . Paratypes (4 ♀): Laos . 1♀ , Prov. Bolikhamsai , Phou Khao Khouay NP. (N18˚30′11.37″, E102˚58′05.52″, Alt : 648 m ), 9.XI.2015 (Y.S. Bae, B.S. Park, S.M. Na, J.W. Kim and D.J. Lee ), Gen. Slide No. INU ˗1817L ; 1 ♂ , Prov. Bolikhamsai , Phou Khao Khouay NP. (N18˚28′25.28″, E103˚05′6.11″), 1.IV.2016 (Y.S. Bae, B.S. Park, S.M. Na, J.W. Kim and D.J. Lee ), Gen. Slide No. INU ˗1832L ; 1 ♂ , Prov. Xieng Khouang , Ban Tha (N19˚44′50.20″, E103˚37′28.10″), 29.VI.2017 (Y.S. Bae, S.M. Na, D.J. Lee, J.H. Ko and T.K. Lee ), Gen. Slide No. INU ˗1845L ; 1 ♂ , Prov. Xieng Khouang , Ban Tha (N19˚44′50.20″, E103˚37′28.10″), 1.VII.2017 (Y.S. Bae, S.M. Na, D.J. Lee, J.H. Ko and T.K. Lee ), Gen. Slide No. INU ˗1847L. Diagnosis. This species is similar to members of shaowuica- species group by general appearance, which including: Microlithosia shaowuica Daniel , M. umbripuncta (de Joannis) , and M. nanlingica Dubatolov, Kishida & Wang. All species of this group have the forewing with a discal and a costal dark spots, and roundly convex costal margin. However, M. laosana n. sp. is differs from members by having the slightly convex forewing costal margin, about 1/3 of apex, plus the dark discal and claviform spots, and diffused distal area ( Figs. 1–3 ; Daniel 1954 : 135). In male genitalia, all species of shaowuica- species group have asymmetrical distal and basal saccular process and vesica with field of small spines. On its turn, M. laosana Bayarsaikhan & Bae , n. sp. presents symmetrically branched distal saccular processes and aedeagus with a bundle of slender spines and field of short spines ( Figs. 4– 6 ; Daniel 1954 : 135, Abb. 97). Description. Adult ( Fig. 1 ). Length of forewing 8˗10 mm . Head and thorax yellowish brown. Ground color of forewing yellow brownish, costal margin slightly convex about 1/3 of apex, a clear dark discal and a diffuse dark claviform spots; cilia pale yellowish. Hindwing white yellowish; cilia as in forewing. Abdomen pale, with yellowish tuft. Male genitalia ( Fig. 4 ). Uncus slender, hook-shaped, with small spine at tip, with almost same length of tegumen; cucullus tapering to apex, shark dorsal fin-shaped; distal saccular process slender, curved downwards, with two asymmetric branch, reaching apex of valvae; basal saccular process stout, finger-shaped, bearing stout setae throughout its length, and with an apical spine, left basal saccular process twice longer than right; juxta domeshaped; aedeagus short, stout, with a long medial process; vesica with a bundle of slender spines and field of short spines. Female unknown. Distribution. Laos (Ban Tha, Prov. Xieng Khouang ; NP. Phou Khao Khouay, Prov. Bolikhamsai ). Etymology. The species is named the country of type locality ( Laos ).