The Oriental flat bug genus Libiocoris Kormilev, 1957 revisited: re-examination, synonymy, and description of a new genus (Heteroptera, Aradidae) Author Bai, Xiaoshuan Author Heiss, Ernst Author Cai, Wanzhi text ZooKeys 2018 789 115 137 http://dx.doi.org/10.3897/zookeys.789.26165 journal article http://dx.doi.org/10.3897/zookeys.789.26165 1313-2970-789-115 871136F2EA3F45A991DCF86E3057DC5B 871136F2EA3F45A991DCF86E3057DC5B Paralibiocoris limuensis sp. n. Figs 60-63, 64-72, 73-80 Type material. Holotype (♂): China, Hainan, Limu, Montain, 6.V.2008, Bai, X. S.; (EMIH). Paratypes. 2 ♂, China, Hainan, Limu, Montain, 6.V.2008, Bai, X. S.; 2♀, China, Hainan, Limu, Montain, 6.V.2008, Bai, X. S. (EMIH). Diagnosis. General aspect similar to Paralibiocoris heissi , but distinguished from the latter by wider pronotum 3.06 times as wide as long (2.80) and more rounded less produced anterolateral lobes (produced and blunt), shorter antennae 1.82 times as long as width of head (2.1) and by antennal segment I longer than III (of same lengths in heissi ). Paralibiocoris limuensis sp. n. differs from P. roundangulus sp. n. and P. hainanensis sp. n. by a wider pronotum (3.06 vs. 2.86 and 2.91 respectively) and a leaf-like shape of the median ridge of meso- and metanotum (Figs 60, 62) and smaller size. Figures 60-63. Paralibiocoris limuensis sp. n. Holotype male (60, 61) dorsal and ventral view; female (62, 63) dorsal and ventral view. Scale bars: 1 mm. Description. Male. Basic morphological structures as of P. heissi and other congeners. Head. Slightly longer than wide across eyes (0.75/0.68); antennae 1.82 times as long as width of head across eyes, length of antennal segments I to IV = 0.40, 0.20, 0.37, 0.27. Pronotum . 3.06 times as wide as long (1.13/0.37); collar narrow; anterolateral lobes produced forward beyond collar as two (1+1) widely rounded granulate lobes, lateral margins converging anteriorly; structure of disc as in other congeners. Mesonotum. Wider than pronotum (1.40/1.13); separated from metanotum by two (1+1) deep furrow laterally; across meso- and metanota medially with an elongate, anteriorly tapering leaf-like shaped plate, its surface slightly concave, 1.34 times as long as wide (0.63/0.47). Metanotum . Wider than mesonotum (1.6/1.40); separated from mtg I by a slightly sinuate thin sulcus. Abdomen. Mtg I and II completely fused, disc medially with a barrel-shaped sclerite resembling the leaf-stalk of the leaf - shaped ridge, separated from lateral ovate plates by deep furrows; tergal plate with a slightly elevated granulate ridge which is widest on mtg III, sloping posteriorly; pygophore elongate cordate, surface rugose (Figs 76, 77); parameres slender (Figs 78-80). Venter. Vltg VII with a glabrous callus near spiracle VII; spiracles II ventral, spiracles III-VIII lateral and visible from above. Female. Morphological features similar to male but of larger size; head slightly longer than wide across eyes (0.80/0.75); length of antennal segments I to IV = 0.44, 0.24, 0.37, 0.27; pronotum wider than long (1.17/0.40); width of mesonotum 1.6; width of metanotum 1.73; lateral margins of leaf-like median plate across meso- and metanota bisinuous, converging anteriorly to narrow apex, ratio length/width as of male (Figure 66); mtg VII moderately elevated posteriorly, surface rugose, posterolateral angles truncate. Figures 64-72. Paralibiocoris limuensis sp. n. Holotype male (64, 65, 68, 69, 72) dorsal and ventral thorax and abdomen; female (66, 67, 70, 71) dorsal and ventral thorax and abdomen. Scale bars: 0.5 mm. Figures 73-80. Paralibiocoris limuensis sp. n. Holotype male (73) ventral thorax and abdomen; female (74, 75) dorsal and ventral thorax and abdomen; pygophore dorsal and lateral view (76, 77); right paramere in three positions (78, 79, 80). Scale bars: 0.5 mm (73-77), 0.1 mm (78-80). Measurements. [in mm, ♂(n = 3)/♀ (n = 2), holotype in parentheses]. Body length 3.7-3.8/4.2-4.4 (3.8); maximal width of abdomen 1.76-1.9/2.2-2.3 (1.9). Head length 0.7-0.75/0.8 (0.75), width 0.65-0.68/0.7-0.75 (0.68). Pronotum length 0.35-0.37/ 0.4-0.45 (0.37), width 1.02-1.13/1.17-1.2 (1.13). Mesonotum width 1.3-1.4/1.5-1.6 (1.4). Metanotum width 1.5-1.6/1.73-1.8 (1.6). Length of antennal segments I-IV = 0.40, 0.20, 0.37, 0.27/0.4-0.44, 0.20-0.24, 0.37, 0.27 (0.40, 0.20, 0.37, 0.27). Etymology. The name of species reflects the locality of this new taxon. Distribution. China (Hainan). Map 1. Distribution of Paralibiocoris in China, Hainan Island.