The Nolidae are small to medium sized moths and are esti-mated about 1,400 species in 308 genera. They occur world-wide, but primarily palaeotropical in distribution. The synapo-morphies of the Nolidae include the following characters: the dorsally broadened postspiracular bar at the base of the abdomen, the easily detached tegulae and patagia, an elon-gate retinaculum of male wing, and the ventrally directed M₄ male genital muscle (Kitching and Rawlins, 1999).

The genus Roeselia Hubner, one of the largest taxa of Noli-dae, was based on Phalaena cucullatella Linnaeus as the type species, and comprises 203 species worldwide (Beccaloni et al., 2003). The genus is characterized by the bipectinate male antennae, whitish frons, long labial palpi, greyish or light greyish wing ground color with undulating central fascia of forewing, and quadrifine hindwing veation with M₃ and CuA₁ stalked. It is superficially to those of Celama Walker, but can be distinguished by the shape of the male and female genitalia. The male genitalia of Roeselia differ from those of Celama by the presence of uncus with hairy socii, the absence of subscaphium and the undivided valva. The female genitalia differ from those of Celama by having the large corpus bursae with two signa (Holloway, 2003; Choi, 2006).

Up to now, a total of 19 species in three genera of Nolidae are recognized in Korea (Oh, 2001; Choi, 2006). Among them 6 species of Roeselia are recognized: Roeselia fumosa (Butler), R. albulalis (Hubner), R. mediofascia Inoue, R. gigiantoides Inoue, R. protogigas Inoue, and R. costalis (Staudinger). The present study describes a nolid species, Roeselia triangulalis (Leech), for the first time in Korea. Two male specimens were collected at the southern slope of Mt. Halla-san, Jeju-do. Examination of adults including the male and female geni-talia refers to Scoble (1992). Abbreviations are as follows: TL, type locality; MNU, Mokpo National University, Jeon-nam; JJ, Province Jeju-do.

Order Lepidoptera Linnaeus, 1758

Family Nolidae Hampson, 1894

Subfamily Nolinae Hampson, 1894

Genus Roeselia Hubner, 1825

1*Roeselia triangulalis (Leech) (Figs. 1, 2)

Nola triangulalis Leech, [1889] 1888: 608. TL: Japan: Sat-suma, Sikkim, Assam.

Roeselia triangulalis: Matsumura, 1930: 94.

Meganola triangulalis: Holloway, 2003: 26.

Material examined. Korea: [JJ] 1♂, Seoguipo-si, Namwon-eup, Silye-ri, Mt. Halla-san, N33？ 19′56.7′′, E126？ 36′25.7′′,499 m, 11 Jun 2009 (MNU); 1♂, Seoguipo-si, Namwon-eup, Harye-ri, Mt. Halla-san, N33？ 18′56.8′′, E126？ 37′09.4′′, 264 m, 4 May 2010 (MNU).

Diagnosis. This species can be distinguished by the bipecti-nate male antennae, broad frons with dark ochreous and whitish scales, long labial palpi with distally dilated second segment, and costally dark brownish scales and the dark brownish postmedial line and subtermen of forewing. This species is similar to R. protogigas in the dark brownish spot on costa of forewing, but can be distinguished by the smaller

wingspan and the rounded postmedial line without costal pro-jection of forewing. The male genitalia can be diagnosed by the short uncus, with hairy socii, the long tegumen twice to the tegumen in length, the long triangular saccus, the slender membranous valva with a strong spine-like harpe and slender aedeagus with a long spinular cornutus. The male genitalia are similar to those of R. protogigas, but can be distinguished by the shape of harpe that is spine-like, distally dilated valve and the rod-shaped cornutus of vesica. The female genitalia can be distinguished by the simple sterigma, the long ductus bursae and a large ovate corpus bursae with a lip-shaped sig-num. The female genitalia are similar to those of R. protogigas, but can be distinguished by the long ductus bursae with anteriorly twised.

Description (Fig.1 ). Wingspan 20-21 mm. Antennae in male bipectinate; frons broad, trapezoidal, mixed with yellowish white and dark ochreous scales; labial palpi long, almost twice the eye diameter, projected forward, 2nd segment dis-tally dilated. Body and legs covered with whitish scales. Forewing ground color light grayish, costa basal part covered with blackish scales; postmedial line blackish, medially slightly projected outward; termen dark brownish with an undulating blackish line. Hindwing ground color light grayish, paler at basal part.

Male abdomen and genitalia (Fig.2 A-C): Eighth tergite posteriorly sharp edges. Uncus short, slender, basally tapering; socii hairy; tegumen long, twice the length of vinculum; juxta simple with a thin sclerotized line; saccus long, triangular.Valva long, distally expanded; costa slender, weakly sclero-tized; sacculus slender with a strong spine-like harpe. Aedea-gus slim; vesica long, tubular with a long rod-like cornutus.

Female genitalia: Papillae anales simple, roudned. Anterior apophyses long, twice of the posterior apophyses. Antrum U-shaped and membranous. Ductus bursae long, narrow, twisted anteriorly. Corpus bursa large, ovate, membranous,with a lip-shaped signum (Holloway, 2003).

Distribution. Korea, Japan, Taiwan, N. India, Sundaland.

Biology. Flying period of moths is from May to June in southern Korea.

Korean name: 1*남방삼각무늬혹나방 (신칭)