Bioacoustics of Chloroscirtus columbianus

Description. Male ( holotype ). Body colouration yellowish with greenish tinge, light brown eyes, almost whitish dorsum of epicranium (including upper rostral tubercle and apex of lower rostral tubercle), a pair of yellow longitudinal stripes on epicranium behind eyes (along lateral edges of whitish epicranial part) and on pronotum along lateral edges of its disc, transparent some membranes in stridulatory apparatus of right tegmen and most part of hind wings (but distal portion of their costal part yellowish), light brown to yellowish abdominal tergites and sternites, and brown apical parts of cerci. Both rostral tubercles rather small and narrowing to almost acute apex, but upper tubercle with dorsomedian groove, lower tubercle anteriorly flattened, and their apices not in contact (barely not reaching to each other); pronotum rather high and short, with elongate but not narrow disc having slightly concave anterior and more convex posterior edges, and with narrow but not deep (almost angular) humeral notches; wings long; tegmina slightly shorter than hind wings, rather narrow, with normal RS and stridulatory apparatus as in Figs 319, 320 ; last tergite with long and almost angular posterolateral lobes ( Fig. 322, 323 ); epiproct rather narrowly triangular but with widely rounded apex, directed downwards; cerci arcuate in proximal half, with apical part having short but widened and flattened ventral branclet (posteriorly, this branchlet more hook-like than disc-like) as well as not widened dorsal branchlet curved somewhat medially and with two acute denticles at apex (these denticles located very near each other) ( Figs 322–328 ); genital plate long and narrow, narrowed in middle part, deeply bifurcated in distal half, and with rather long and medially flattened styles ( Figs 321, 323 ); genitalia membranous. Female unknown. Length (mm). Body 24.0; body with wings 42.0; pronotum 5.4; tegmina 33.0; hind femora 18.0. Comparison. The new species is very similar to Ch. discocercus Rehn, 1918 ( Costa Rica ) and may be only its subspecies; it is distinguished from the latter congener in the ventral branchlet of apical part of male cercus more hook-like than in Ch. discocercus , dorsal branchlet of this cercal part having denticles located very near each other (for comparison see Figs 327–329 ), and male genital plate with a somewhat deeper posteromedian notch (see Figs 321 and 330 ). From the other congeners, Ch. columbianus sp. nov. differs in the presence of the above-mentioned flattened hook-like structure on the male cercus.