Bioacoustics of Atlanticus (Atlanticus) minor

( Fig. 1H ; 2G ; 3G ; 7M,N ; 9G ; 11F ; Table 1) Holotype . Male [IOZ(E)1340331], China : Shanxi Prov. , Qinshui County , Xiachuan , 1991.IX.4 , Coll. Liu Jupeng. Paratype . 6 females , [IOZ(E)1340329, 1340378, 1340314–1340317], same data as for holotype . Diagnosis. Small-sized compared to the congeners in Sinensis Group ( Fig. 7M,N ; 9G ). Hind femur three times the length of the pronotum. Male tegmen not extending beyond middle of the second abdominal tergum when contracted, with a reticulation of poorly defined veins; posterior portion convex ( Fig. 7M ; 9G ). Proximal three quarters of stridulatory file on underside of male left tegmen with 60 distinct teeth gradually becoming larger centrad ( Fig. 1H ). Mirror of male right tegmen concealed by pronotum, with a sclerotized transverse vein in proximal part ( Fig. 2G ). Male cerci comparatively slender, of equal width, extending to a comparatively small uncinate internal tooth situated in centre, and then gradually narrowed with a slightly incurved obtuse pointed apex ( Fig. 3G ). Female ovipositor narrow ( 1.2 mm wide in middle) and short, with apical half slightly recurved ( Fig. 7N ). Description. Holotype . Male. Disc of prozona slightly convex, and metazona approximately flat. Pronotum narrowest in proximal one-third, and then abruptly ampliate caudad. Lateral lobes of pronotum slightly longer than high, deepest before middle; anterior margin very slightly concave, posterior margin oblique with indistinct central concavity, ventral margin slanting caudad to posterior angle. Fore femur with 2 exterior ventral spines. Middle femur with 1–2 external ventral spines in apical half. Hind femur with 3 exterior and 2 interior ventral spines. Fore tibia with 3 dorsal spines on exterior margin and 6 ventral spines on both margins. Middle tibia with 6 ventral spines on both margins, 2 exterior and 4 interior spines on dorsal margins. Hind tibia with 16 exterior and 8 interior spines on dorsal margins. Subgenital plate approximately as wide as long; apical margin with a comparatively deep wide “U”-shaped notch between styli, notch slightly shorter than stylus ( Fig. 11F ). Female ( Fig. 7N ). Size much more robust than male. Ovipositor twice longer than pronotum, with slightly recurved apical half (about 5º angle). Proximal one-third of ovipositor narrowed from base, remainder of equal width, with upper margin slightly obliquely truncate. Subgenital plate distinctly transverse; apex slightly emarginate in apical one-sixth, forming two indistinctly obtuse triangular lobes. Coloration. Generally reddish brown. The following parts shining black: the outer surface of two basal antennal joints; lateral surfaces of fastigium verticis; postocular fascia; lateral lobes of pronotum except a comparatively narrow brown fascia along the lower margin extending a little above humeral notch. The following parts shining blackish brown: upper portion of pleurae; proximal part, central upper part, and apical part of fore femora; proximal half of fore tibiae; a line on lower half of exterior surface of middle femora; a robust line with indefinite striation separated the upper half from the lower half; proximal upper portion of hind femora. Disc of prozona rust-like, and metazona testaceous. Abdominal tergites rust-like, with indefinite dark brown dots. Male tegmen reddish brown with blackish subcostal and radial veins, stridulatory area on male left tegmen dark with blackish veins. Ventral spines of median femur blackish. Notes. This species is smallest among all described Chinese species. Apart from the size, it also differs from A. sinensis by its coloration (especially of male tegmen and femur), width of male tegmen, shape and length of female ovipositor, and shape of female subgenital plate. Etymology. The new species is named for its small size. Distribution. China ( Shanxi ).