Rhagoba flavolineata Ko & Bae, 2024

Ko, Jae-Ho, Bayarsaikhan, Ulziijargal, Lee, Tak-Gi & Bae, Yang-Seop, 2024, Review of the genus Rhagoba Moore, 1888 (Lepidoptera, Crambidae, Spilomelinae) from Laos, with a description of new species, Zootaxa 5443 (1), pp. 127-134 : 130-133

Rhagoba flavolineata Ko & Bae , sp. nov.

( Figs. 3–5 , 8 , 10 )

Type material. Holotype: ♂, LAOS: Phou Khao Khouay National Protected Area , Bolikhamsai Prov., 22 VII 2018 (Bae Y.S., Lee D.J., Ko J.H., Lee T.G., Jang J.M., Bayarsaikhan U.), (18°27´23.76”N 103°03´05.15”E Alt. 470 m), genitalia slide no. INU-7134L (Type deposited in NIBR) . Paratypes (5 ♂, 2 ♀): LAOS : 1 ♂, 1 ♀, Phou Khao Khouay National Protected Area , Bolikhamsai Prov., 22 VII 2018 (Bae Y.S., Lee D.J., Ko J.H., Lee T.G., Jang J.M., Bayarsaikhan U.), (18°27´23.76”N 103°03´05.15”E Alt. 470 m), genitalia slide no. INU-7135L, 7136L ; 1 ♂, Phou Khao Khouay National Protected Area , Bolikhamsai Prov., 28 VIII 2018 (Bae Y.S., Na S.M., Lee D.J., Ko J.H., Lee T.G., Cha Y.B., Jang J.M.), (18°27´23.76”N 103°03´05.15”E Alt. 470 m), genitalia slide no. INU-7133L ; 2 ♂, 1 ♀, Phou Khao Khouay National Protected Area , Bolikhamsai Prov., 26 VII 2019 (Bae Y.S., Qi M.J., Lee D.J., Ko J.H., Lee T.G., Cha Y.B., Jang J.M.), (18°27´23.76”N 103°03´05.15”E Alt. 470 m), genitalia slide no. INU-7131L, 7132L, 7138L ; 1 ♂, Phou Khao Khouay National Protected Area , Bolikhamsai Prov., 27 VII 2019 (Bae Y.S., Qi M.J., Lee D.J., Ko J.H., Lee T.G., Cha Y.B., Jang J.M.), (18°27´23.76”N 103°03´05.15”E Alt. 470 m), genitalia slide no. INU-7137L .

Diagnosis. Rhagoba flavolineata sp. nov. exhibits a strong metallic blue reflection on the thorax and translucent patches on the wings, similar to R. octomaculalis , and R. obvellata . However, it can be distinguished by the following characteristics ( Figs. 1–3 ): the postmedial area of the forewing has two semicircular translucent patches (orbicular or reniform patch in R. octomaculalis and R. obvellata ); the hindwing has two large semicircular translucent patches (two small orbicular patches or absent in R. octomaculalis and R. obvellata ); the abdomen has partly deep yellow bands (dark brown overall in R. octomaculalis and R. obvellata ). In the male genitalia ( Figs. 6–8 ), the apex of the uncus is nearly triangular (nearly spatulate in R. octomaculalis and R. obvellata ); the fibula is caniniform (spine-shaped in R. octomaculalis and R. obvellata ). In the female genitalia ( Fig. 9–10 in this study, and Du & Li 2012, p. 370, 5B), the sclerotized part of the antrum is shorter than that of R. octomaculalis and R. obvellata .

Description. Adult ( Figs. 3–5 ). Length of forewing 10–12 mm in both sexes. Vertex covered with dark brown mixed grayish yellow scales; frons covered with dark brown, metallic blue reflection scales; antenna filiform, scape covered with dark brown, metallic blue reflection scales; ocellus well-developed; chaetosemata absent; labial palpus upturned, grayish yellow mixed with dark brown scales; maxillary palpus porrect, covered with dark brown scales; proboscis well-developed, grayish yellow mixed with dark brown scales. Patagium and tegula dark brown, metallic blue reflection scales. Ground color of forewing dark brown; median area with a subreniform and claviform translucent patches; postmedial area with a large oviform translucent patch, and a dark brown line transversing in the center; fringe dark brown, except white from CuA 1 to M 3. Ground color of hindwing dark brown; basal area with a large reniform translucent patch; postmedial area with a large subreniform patch; fringe dark brown, except white from 2A to 1A. Abdomen dark brown, except deep yellow from third to sixth segments; deep yellow segments with dark brown lines at posterior part of each segment.

Male genitalia ( Fig. 8 ). Uncus nearly triangular, densely setose at apex; valva ovoid, membranous and with a weakly sclerotized band transversing valva; fibula small, caniniform; sacculus well-developed, strongly sclerotized; juxta guttiform, sclerotized; saccus U-shaped; phallus cylindrical, sclerotized basally, with a rod-shaped cornutus.

Female genitalia ( Fig. 10 ). Papillae anales ovate; posterior apophyses almost same length as anterior apophyses; antrum funnel-shaped, sclerotized; ductus seminalis from near posterior end of antrum; ductus bursae membranous, about 2 times length of corpus bursae; corpus bursae ovate, with two small ovoid signa.

Distribution. Laos.

Etymology. The specific name is derived from the Latin word flavolineata , which refers to the deep yellow abdomen.

Figures

FIGURES 1–5. Adults of genus Rhagoba spp. from Laos. 1a. Rhagoba octomaculalis, female (INU-7104L). 1b. ditto, male (INU-7105L). 1c. ditto, male (INU-7106L). 2. Rhagoba obvellata, male (INU-6810L). 3a. Rhagoba flavolineata sp. nov., male (HT, INU-7134L). 3b. ditto, female (PT, INU-7136L). 4. Head and thorax of Rhagoba flavolineata sp. nov. showing blue reflection on thorax (HT, INU-7134L). 5. Lateral view of the head of Rhagoba flavolineata sp. nov. (HT, INU-7134L).

FIGURES 6–8. Male genitalia of Rhagoba spp. from Laos. 6. Rhagoba octomaculalis (INU-7102L). 7. Rhagoba obvellata (INU-6810L). 8. Rhagoba flavolineata sp. nov. (HT, INU–7134L).

FIGURES 9–10. Female genitalia of Rhagoba spp. from Laos. 9. Rhagoba octomaculalis (INU-6809L). 10. Rhagoba flavolineata sp. nov. (PT, INU-7138L).