The assassin bug genera Nagustoides and Stenolemus (Hemiptera: Heteroptera: Reduviidae) newly recorded from Japan Author Ishikawa, Tadashi Author Naka, Takeru text Zootaxa 2016 4161 4 593 600 journal article 10.11646/zootaxa.4161.4.12 e1790d40-e961-4ece-9ecf-4c6e483c7bab 1175-5326 272274 C6CEC2A3-97DA-407B-9647-6244DE0A49AB Stenolemus alikakay Rédei & Tsai, 2010 ( Figs. 17–30 ) Stenolemus alikakay Rédei & Tsai, 2010 : 28 (new species) Among the Oriental species of the genus Stenolemus , this thread-legged assassin bug is recognized by the following combination of character states: posterior lobe of head with a pair of wide, blunt tubercles dorsally ( Figs. 21, 25 ); pronotum not darkened on basal part ( Fig. 20 ); petiole of pronotum relatively short, approximately twice as long as its width at middle in dorsal view ( Figs. 17–18 , 20–21 ); posterior pronotal lobe with a single carina along meson and a pair of conical projections on disc ( Figs. 20–21 ); profemur with four brown annulations ( Fig. 22 ); middle and hind legs lacking pigmented tufts of setae ( Figs. 23–24 ); mesofemur with three brown annulations ( Fig. 23 ); metafemur with four brown annulations ( Fig. 24 ); and a peculiar color pattern of the forewings ( Fig. 19 ). Body length (from apex of head to apex of abdomen) 8.8–11.6 mm. A detailed description of this species was provided by Rédei & Tsai (2010) . FIGURES 20–26. Stenolemus alikakay from Japan. 20–21, Head and pronotum, dorsal (20) and lateral (21) views; 22–24, femora of fore (22), middle (23), and hind (24) legs; 25, head, lateral view; 26, protarsus. Scale bars: 1 mm for Figs. 20–25, 0.5 mm for Fig. 26. FIGURES 27–30. Stenolemus alikakay from Japan and its habitat. 27, A living individual; 28, mossy and lichened trunk of Castanopsis sieboldii on which the individual of S . alikakay was found; 29–30, habitat of S . alikakay on Ishigaki-jima Island. Specimens examined (n=2). JAPAN : the Ryukyu Islands—Ôhama , Ishigaki-jima Is.: 1 ♀ ( Figs. 17–19 , 22–24 ), 4.ix.2012 , T. Higa ; 1 ♀ ( Figs. 20–21, 25–27 ), 18.vi.2013 , T. Naka. Distribution. Japan (the Ryukyu Islands: Ishigaki-jima Is.); Taiwan . Remarks. Among the reduviids of Japan , Stenolemus alikakay is at first sight similar in general habitus, especially in its hairy body and appendages, to the thread-legged assassin bug Myiophanes tipulina Reuter, 1881 . However, S . alikakay can be easily distinguished from M . tipulina by its much smaller body size (approximately 10 mm vs. 16 mm ), the presence of the petiole in the pronotum ( Figs. 17–18 , 20–21 ) (vs. absence), and forewings with discal and basal cells ( Fig. 19 ) (vs. discal cell only). Rédei & Tsai (2010) observed a living S . alikakay on a spider web (spiders missing) built on a tree trunk, walking very slowly and imitating a piece of debris or dried leaf swinging lightly in the breeze. Each of the two Japanese specimens examined here was found on the mossy and lichened trunk of a large tree, Castanopsis sieboldii (Makino) Hatus (Fagaceae) , in a well-preserved forest on Ishigaki-jima Island ( Figs. 27–30 ). When found, they were slowly swaying back and forth on the trunks while maintaining their position.