The genus Phymatodes Mulsant (Coleoptera: Cerambycidae) distributes throughout the Holarctic region. Approximately 50 species have been recorded from the world, and four species have been recorded in Korea. In 2010 and 2011, we collected many grape twigs which were severely damaged by unknown larvae of longhorn beetles from Gyeonggi province. They were reared at indoor condition until their emergences in order to see which species inflicted damage on the grape vines. Two species of unknown longhorn beetles were collected. They were identified as Phymatodes jiangi Wang et Zheng and P. zemlinae Plavilstshikov et Anufriev that are new to Korea. The diagnosis and illustrations of P. jiangi and P. zemlinae are provided.

Larval stages of Callipogon relictus (Semenov) (Coleoptera: Cerambycidae), a gigantic longhorn beetle designated as a natural monument of Korea, has never been studied as it is hardly discovered in nature. The DNA barcoding gene, mt-COI, was used to identify a dead larva found in the Gwangneung forest of the Korea National Arboretum. Based on the result, we provide the morphology of the immature stage, with the illustrations of diagnostic characteristics.

Cydia Hübner is a large genus in the family Tortricidae, including over 230 described species worldwide (Brown, 2005) and mainly in the Holarctic region. Nine species of the genus reported from Korea. We found a new species of Cydia feeding on the cones of Picea jezoensis (Siebold et Zucc.) Carrière in Mt. Deogyu. The adults and the early stages of Cydia picicola sp. nov. are described and illustrated from Korea. The life history and larval feeding habits are briefly discussed.

The family Limacodidae, which is generally known with a Korean common name, ‘Sswaegi’, belongs to the superfamily Zygaenoidea. Most species have strong hair-like bristles, which causes painful skin irritation on outer surface of larval stages. Members of the family are small to medium sized moths and can be defined with the combination of the following characteristics: larvae without crochets, adults with R3, R4 and R5 veins of the forewing stalked and papillae anales disk-shaped. The family contains approximately 1,000 species of 400 genera from the world and a number of species recorded from the tropical regions. In Korea, seven species were studied by Fixen (1887) for the first time. Since then, some fragmentary reports and taxonomic studies were made by several lepidopterists. Although there are 25 species of 19 genera known from Korea, comprehensive study for Korean limacodids has not carried out up to date. As the preliminary step for a revisional study on Korean species of the family, a literature review has been done, and some corrections were made on incorrect scientific names in ‘Checklist of Korean insects (2010)’, which was most recently published.