The genus Coccus is reviewed as 4 species from Korea, including a new species, C. ficicola sp. n., and a first recordof C. maloti (Takahashi, 1956). A key to four species of Coccus known from Korea is provided with diagnoses, illustrationsand photographs.

A genus Omosita Erichson, 1843 which belongs to the sap beetle, Nitidulidae, is reviewed from Korea. Two species Omosita colon (Linnaeus, 1758) and O. japonica Reitter, 1874 are previously known from Korea, one species O. discoidea (Fabricius, 1775) is first recorded from Korea. A key to species, re-descriptions, biology, illustrations of both male and female of the genus Omosita are provided.

DNA barcode projects in Hexapoda have been initialized and progressed accumulating large number of mitochondrial gene sequences. However, due to large number of data, overview of DNA barcode projects was not conducted until now. Here we reported the current status of DNA barcode projects with the aid of Insect Mitochondrial Genome Database (IMGD; http://www.imgd.org/) which archives 128,562 partial mitochondrial gene sequences (PMEs) of Hexapoda. Among 37 mitochondrial genes, COI has been used popularly (22,379 PMEs;17.40 %) through all 33 orders. Through 513 researches, different parts of COI PME have been utilized differently along with hexapod orders. Inaddition, by calculating genetic divergences of COI PMEs, intra-species and inter-species in 21 hexapod orders were distinguished by 5% divergence and some of mitochondrial genes in certain order present higher genetic divergences than that of COI. Based on these results, we confirmed that DNA barcode is a use ful tool to identify hexapod species and several mitochondrial genes can be good molecular markers to support COI.

We performed molecular and morphological analyses to determine generic limit of the genus Aulacorthum including several species with controversial taxonomic histories. The sequences of four mitochondrial genes, COI, COII, srRNA and lrRNA, and one nuclear gene, EF1a, implied that Aulacorthum is not monophyletic, with Aulacorthum magnoliae and Aulacorthum nipponicum forming a clade that is not sister to other currently recognized Aulacorthum species. Morphometric analysis based on 20 morphological characters also showed that A. magnoliae and A.nipponicum exhibited morphological characteristics distinct from congeneric species. Based these results, we propose a new genus, Neoaulacorthum ge. n. for A.magnoliae and A.nipponicum.