Revision of the plant bug genus Diognetus, with descriptions of thirteen new species from the Oriental and Eastern Palearctic Regions (Hemiptera: Heteroptera: Miridae) Author Yasunaga, Tomohide Research Associate, Division of Invertebrate Zoology, American Museum of Natural History, New York, NY 10024, USA, c / o Nameshi Author Schwartz, Michael D. - 33, Nagasaki 852 - 8061, Japan; e-mail: yasunagat. amnh @ gmail. com Author Chérot, Frédéric Département de l’Etude du Milieu Naturel et Agricole, Service Public de Wallonie, Gembloux, BE- 5030, Belgium; e-mail: frederic. cherot @ spw. wallonie. be text Acta Entomologica Musei Nationalis Pragae 2023 Acta. Ent. Mus. Natl. Pragae 2023-03-12 63 1 1 55 http://dx.doi.org/10.37520/aemnp.2023.001 journal article 10.37520/aemnp.2023.001 1804-6487 7887421 3F2C90B1-6EA1-4B38-A218-C314D09F6E00 Diognetus magnificus sp. nov. ( Figs 14G− I , 15K− N , 16F− H , 32A− F ) Type material. HOLOTYPE : J, INDONESIA : SUMATRA : North Sumatra , Dolokmaranggir [Dolok Merangir], 3.14100 , 99.12600 ; no date provided, E.W. Diehl ( AMNH _ PBI 00419630 ) ( CNC ) . PARATYPE : INDONESIA : SUMATRA : N. Sumatra , Karo,Aek Popo, NW of Lake Toba, N 2.92 E 98.50, 1,700 m , light trap, 1 May 1989 , K. Maruyama, 1 ♀ ( TYCN ). Description. Body elongate, large-sized, more than 6.3 mm ; 2nd largest species among known congeners. COLORATION: Body generally castaneous ( Fig. 14G− I ); Fig. 16. Female genitalia of Diognetus insulanus ( Yasunaga, 1994 ) (A− C), D. intonsus Distant, 1904 (D− E) and D. magnificus sp. nov. (F− H). A, F − genital chamber; D − sclerotized ring; B, G − posterior wall; C, E, H − ovipositor (gonapophysis I). Scale bars 0.1 mm. dorsum partly darkened. Head somewhat lighter; frons weakly darkened. Antennae pale brown; segment I partly suffused with red; segments III and IV brown. Labium pale reddish-brown; apex of segment IV infuscate ( Fig. 14H ). Pronotum widely darkened posteriorly, with yellowish posterior margin; calli with a pair of dark, ovoid spots; mesoscutum pale brown; scutellum uniformly darkened in J ( Fig. 14I ) or pale brown with dark mesal and lateral stripes in ♀ ( Fig. 14G ); pleura widely fuscous; scent efferent system creamy yellow. Hemelytron castaneous, with dark irregular spots in ♀ ; cuneus tinged with red, with yellowish extreme apex; membrane pale smoky brown, with distally pale veins and two semitransparent spots posterior to apex of cuneus. Coxae and legs pale brown; meso- and metafemora darkened except for pale bases; apical half of each tarsomere III brown. Ventral surface of abdomen dark brown, with paler median part in ♀ . SURFACE AND VESTITURE: As in generic diagnosis; dorsal surface weakly shining, with rather sparsely distributed, silvery, reclining setae; scutellum less rugose, sparsely and finely punctate; hemelytron rather matte. STRUCTURE: Antennal segment I obviously longer than segment IV. Labium longer than basal width of pronotum, reaching but not exceeding apex of mesocoxa. Scutellum weakly arched. Metathoracic scent efferent system as in Fig. 32B . Metatarsomere II almost equal in length to III ( Fig. 32C ). MALE GENITALIA ( Figs 15K− N ): Left paramere with a conical process at middle and developed, squared protuberance of sensory lobe ( Fig. 15K ). Vesica with short MS and well-sclerotized, spicule-like LS; RS with weak TP ( Fig. 15N ). FEMALE GENITALIA ( Figs 16F− H , 32A− F ): Sclerotized ring thickened anteriorly ( Figs 16F , 32D ); posterior wall ( Figs 16G , 32E ) with narrow dorsal structure; interramal lobe relatively wide with rounded lateral margin; micro-spines on interramal lobe with 2−4 sharp branches ( Fig. 32F ). Measurements. See Table 1 . Differential diagnosis. Recognized by its large size; long antennal segment I that is longer than IV; short labium not exceeding apex of mesocoxa; and male and female genitalic structures as described above. Externally most similar to D. dhampus sp. nov. from Nepal , from which D. magnificus sp. nov. can be distinguished by the larger size, antennal segment I longer than IV, and darkened metafemur. Fig. 17. Habitus images of Diognetus spp. A− C − D. minusculus sp. nov. , J (A) and ♀ (B− C); D− E − D. pilosus , J (D) and ♀ (E); F − D. puspae sp. nov. , J. Scale bar 2 mm. Etymology. Latin adjective magnificus (= magnificent), referring to the large-sized body of this new species. Biology. Unknown. Distribution. Indonesia (N. Sumatra ).