A new species of Discochiton Hodgson & Williams, 2018 collected on culms of Bambusa sp. (Poaceae) in Myanmar is described and illustrated. The new species is morphologically similar to D. expansum (Green, 1896), but distinct from it in having the legs four or five segmented, the preopercular pores associated with all four clear areas, and the 10–16 stigmatic spines on each cleft; in D. expansum, it has the legs reduced to single-segmented leg stub, the preopercular pores associated with two or three clear areas, and the 3–7 stigmatic spines.

Coccidae is one of the major families of scale insects, with many species considered to be serious agricultural or horticultural pests. However, the phylogenetic relationships among coccid subfamilies, tribes and genera are poorly understood because the previous hypotheses are based only on morphological characters and cladistic analysis. Here, we present the first molecular phylogeny of the family based on DNA fragments of a mitochondrial gene (COI), nuclear ribosomal RNA genes (18S and 28S), and elongation factor-1α (EF-1α). We recover a monophyletic family Coccidae with strong support. However, some genera (Coccus and Pulvinaria), tribes (Coccini, Paralecaniini, Pulvinariini and Saissetiini) and subfamilies (Coccinae and Filippiinae) within the family found to be paraphyletic- or polyphyletic. Moreover, particular types of wax formation, which have been used as important taxonomic characters in Coccidae, were found in several unrelated taxa.

The Japanese pine bast scale, Matsucoccus matsumurae (Kuwana, 1905), is a destructive pest of pine trees in America, East Asia and Northern Europe. The spread of damage to black pine trees, Pinus thunbergii, of M. matsumurae was reported from all southern, and some eastern and west costal regions in Korea, under the name of M. thunbergianae which was newly described by Miller & Park (1987) as a new species. Historically, M. thunbergianae was synonymized with M. matsumurae by Booth & Gullan (2006), on the basis of molecular sequence data. However, the supporting data for the synonym is unavailable in any DNA database, such as GenBank and BOLD. Moreover, M. thunbergianae have been still used to the resent scientific studies in Korea. Here, we performed morphological and molecular comparison to review the result of Booth & Gullan (2006), using M. matsumurae from Fukuoka, Japan and topotype materials of M. thunbergianae from Goheung, Korea. Our data supported the opinion of Booth & Gullan (2006) following results: The morphological features of adult female and male of M. thunbergianae are identical to those of M. matsumurae. Also, DNA sequences (COI, 18S rDNA and 28S rDNA) of M. thunbergianae showed identical or very low genetic distances with those of M. matsumurae. From the regional sampling in Korea, M. matsumurae was newly found in Jeju and Seoul.

Two species of the genus Coccura Šulc, 1908 from Korea are reviewed. Coccura convexa Borchsenius, 1949 and C. suwakoensis (Kuwana and Toyoda, 1915) were recorded from North Korea by the report of Danzig (1980). Although Kwon et al. (2003) described Coccura comari (Kunow, 1880) from South Korea, we found that this species was misidentification of C. suwakoensis. In this study, we suggest that Coccura comari (Kunow, 1880) is to be excluded from the Korean fauna. The occurrence of C. suwakoensis is also recorded from South Korea for the first time, based on the additional populations which were heavily infested on the Chinese fingetree, Chionanthus retusus Lindley and Paxton. A key to the species of Coccura known from Korea is provided with diagnoses and photographs.

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.

The family Coccidae Fallén, 1814, which is named soft scale insect, is recognized from Laos as twenty-two species including nine new records: Ceroplastes cirripediformis (Comstock, 1881), C. stellifer (Westwood, 1871), Coccus formicarii (Green, 1896), C. gymnospori (Green, 1908), C. hesperidum Linnaeus, 1758, C. latioperculatum (Green, 1922), Drepanococcus cajani (Maskell, 1891), Saissetia miranda (Cockerell & Parrott in Cockerell, 1899), and S. oleae (Olivier, 1791). A key to the Lao species of Coccidae is provided with diagnoses, photographs and host information for each species.

The superfamily Coccoidea, known as scale insects, are economical pests of agricultural, ornamental, and greenhouse plants, as well as highly intercepted insects in quarantine inspection. However, their faunal study have been poorly conducted in Myanmar. During recent field investigations in Myanmar, we collected thirty-seven new records: Coccidae (17), Diaspididae (4), Eriococcidae (1), Monophlebidae (4), Ortheziidae (1) and Pseudococcidae (10). In this study, total eighty-eight species in 15 families of scale insects are listed from Myanmar. Diagnoses and photographs are provided with keys to the Burmese scale insects. Also, the economical importance for each major pests is discussed.

The genus Saissetia Deplanche is newly reported from Laos, including two new species, Saissetia simulocoffeae Choi & Lee, sp. n. and S. quasioleae Choi & Lee sp. n., and a first record of S. miranda (Cockerell & Parrott, 1899). A key to all five species of Saissetia known from Indochina is provided. The DNA barcodes (mitochondrial cytochrome oxidase subunit I-mtCOI) of the two new species were obtained for future use.

Tribe Saissetiini Hodgson, 1994 are reviewed as 8 species of 3 genera from Korea, including Parthenolecanium fletcheri (Cockerell, 1893) and Saissetia miranda (Cockerell & Parrott, 1899) new to the Korean peninsula. Diagnosis and descriptions for Korean species are redescribed with illustrations, photographs and key to species.

The soft scales (Hemiptera: Coccidae) are plant-sucking insects, some of which are considered as serious agricultural pests. Here, we performed phylogenetic analysis of Coccidae, based on molecular fragments 1813bp containing mitochondrial DNA (COI), nuclear ribosomal RNA genes (18S and 28S), and elongation factor 1α (EF1-α). Data sets of 64 taxa were analyzed using maximum likelihood (ML) and Bayesian inference (BI). Our molecular analyses represent: 1) Monophyletic clade of Ceroplastinae is nested within the major clade of Coccinae; 2) Four tribes of Coccinae are paraphyletic, especially Megapulvinaria and Paralecanium not clustered within the major clade of Coccinae; 3) Didesmococcus is separated from the clade of Eulecaniinae; 4) Filippiinae and Cardiococcinae are paraphyletic with respect to some of Coccinae and Eulecaniinae.

The Tribe Pulvinariini Ashmead, 1891 in Korea is reviewed with a newly reported genus Leptopulvinaria Kanda, 1960. The tribe Pulvinariini is revised as 8 species of 2 genera from Korean peninsula including three new records, Leptopulvinaria kawaii Tanaka & Amano, 2008, Pulvinaria hydrangea Steinweden, 1946 and P. photiniae Kuwana, 1914. In this study, the morphological data about adult females of the species are redescribed from Korean specimens and diagnosis, descriptions and illustrations are also provided.

The brown soft scales, Coccus hesperidum (Linnaeus, 1758) is one of the most widely distributed species in the family Coccidae. Interestingly, this species shows considerable morphological variation depending upon the geography and host plants. Although, Korean populations also exhibit morphological variation between geographical regions, this species have been regarded as one species without intensive studies. In this study, we performed Neighbor joining analysis of combined data set of Cytochrome oxidase subunit I COI, 18S ribosomal RNA 18S rRNA, 28S ribosomal RNA 28S rRNA and Elongation factor I-alpha EFI-α genes for Korean populations of brown soft scales. The result of molecular analysis indicated that there are three distinct populations in Korea. Among three populations, one population is separated from two populations with 9% of molecular divergence. Based on high level of molecular divergence, we propose a cryptic species of C. hesperidum with description and illustrations of morphology.

Pulvinaria regalis Canard, 1968 is newly recorded in the Korean peninsula. The genus Pulvinaria Targioni Tozzetti (Hemiptera: Coccidae) is revised as 6 species from Korean peninsula including a new record P. regalis. In this study, we provide description, illustration and key to species of this group.