The subfamily Mirinae (Hemiptera: Heteroptera: Miridae) is the largest group of Miridae, commonly called plant bugs (Cassis and Schuh, 2012). Among the mirine genera, a monotypic genus Neomegacoelum was proposed by Yasunaga (1998) to accommodate for the species, Creontiades vitreus (Kerzhner, 1988) because of its unique morphological characters such as parameres and genitalia from the genus Creontiades.

In this study, the genus Neomegacoelum is reported from the Korean Peninsula for the first time based on N. vitreum (Kerzhner, 1998). Re-descriptions and diagnoses of the genus and the species are provided with photographs of dorsal habitus and genitalia based on the Korean specimens.

All measurements in this paper are given in millimeters (mm). Terminology mainly follows Yasunaga (1991) and Braimah et al. (1982). Depository of specimens is Chungnam National University, Daejeon, Korea. Distribution with an asterisk means its new record in this area.

Taxonomy

Genus NeomegacoelumYasunaga, 1998

NeomegacoelumYasunaga, 1998: 63. Type Species: Neomegacoelum vitreumKerzhner, 1988.

Diagnoses.

Recognized by body elongated oval, somewhat wide vertex, somewhat thick collar, hemelytra glabrous and hyaline, left paramere somewhat long and thin, hypophysis small and blunt, sensory lobe somewhat narrow, right paramere generally angulated; vesica membranous, with one long and thick spicule.

Neomegacoelum vitreum (Kerzhner, 1988)

홍색유리날개장님노린재 (신칭) (Figs. 1, 2)

Creontiades vitreusKerzhner, 1988: 32. Neomegacoelum vitreumYasunaga, 1998: 63.

Diagnoses. See the genus diagnoses.

Description.

Male: Bady generally reddish brown, elongated oval (Fig. 1A).

Head reddish brown to fuscous, with sparse short pubescences; vertex somewhat wide, with longitudinal groove; ocelli absent; tylus dark brown; Antennae generally reddish brown, first antennal segment somewhat thicker; 1/2 basal part of second antennal segment pale brown; apex of base of third and fourth segment pale brown. Rostrum generally brown, first and fourth rostral segments dark brown, reaching to hindcoxae, proportion of each rostral segment as 0.6: 0.6: 0.6: 0.7.

Pronotum generally reddish brown to dark brown, glossy, posterior margin narrowly yellowish brown, calli somewhat reddish brown; collar pale brown, somewhat wide; scutellum entirely shiny dark brown. Hemelytra generally reddish pale brown, glabrous and hyaline; posterior apex of clavus dark brown; posterior margin of corium dark brown; outer embolial margin reddish brown or sometimes dark brown; cuneus generally red, anterior margin of cuneus dark brown; membrane grayish brown. Legs generally pale brown, hindfemur reddish brown or dark brown; hindtibia reddish brown or dark brown, with dark brown spines in a row; third segment of tarsus dark brown.

Abdomen generally reddish brown or dark brown, left paramere somewhat long and thin hypophysis small and blunt, sensory lobe somewhat narrow (Fig. 2A); right paramere generally angulated (Fig. 2B); vesica membranous with one long and thick spicule (Fig. 2C, 2D).

Female: as in male except for somewhat yellowish pronotum; more rounded than male (Fig. 1B).

Measurements (in mm). Male (n = 3)/female (n = 1): body length: 5.85-5.96/6.66; head length, excluding neck: 0.45-0.47/ 0.55; head width, including compound eyes: 1.01-1.04/1.14; vertex width: 0.4-0.41/0.46; 1 ^st antennal segment length: 0.91- 1.00/0.98; 2 ^nd antennal segment length: 2.38-2.36/1.84; 3 ^rd antennal segment length: 1.63-1.65/1.27; 4 ^th antennal segment length: 0.91-1.07/1.32; total antennal length: 5.09-6.08; 1 ^st rostral segment length: 0.59-0.63/0.67; 2 ^nd rostral segment length: 0.53-0.63/0.65; 3 ^rd rostral segment length: 0.55-0.58/0.60; 4 ^th rostral segment length: 0.63-0.73/0.65; total rostral length: 2.30-2.57/2.47; anterior pronotal margin width (straight): 0.72- 0.73/0.80; mesal pronotal length: 0.97-0.79/0.98; basal pronotal margin width (straight): 1.67-1.75/1.97; embolial outer margin length (straight): 2.95-3.01/3.22; cuneal outer margin length (straight): 0.64-0.82/0.92; maximum width across hemelytra: 0.89-0.90/1.12; foreleg each parts length (femur: tibia: tarsus): 1.43-1.43:1.45-1.71:0.52-0.53/1.64:1.85:0.58; midleg each parts length (femur: tibia: tarsus): 1.56-1.64:2.00-2.08:0.53-0.55/ 1.87:2.25:0.56; hindleg each parts length (femur: tibia: tarsus): 2.54-2.63:3.68-3.70:0.67-0.68/3.02:4.55:0.69.

Specimen examined. [CNU] 3♂♂, 1♀, Sodong-ri, Ilun-myun, Geoje-si, Kyeongsangnam-do, Korea, 22.VII.2014, JG Kim; [CNU] 1♂, Chungnam National Univ., Gung-dong, Yuseong-gu, Daejeon, Korea, 1.VII.2014, HD Lee.

Distribution. Russia, Japan, Korea (Central)^*

Biology. This species is mostly found on Quercus spp.