Bioacoustics of Decma (Neodecma) laosi

DESCRIPTION. Male ( holotype ). General appearance typical of this genus: body coloration yellowish (light greenish in living condition) with pale eyes, light brown numerous and very short rings on antennal flagellum (in its distal part, these rings distinctly longer and slightly lighter), a pair of almost whitish stripes running from medial parts of eyes to posterior part of hind pronotal lobe (these stripes running along lateral edges of pronotal disc; Figs 1–3 ), light greyish brown marks on some membranes in lateral tegminal fields, transparent membranes of tegminal stridulatory apparatus and of hind wings, light brown posterior edge of last tergite and distal part of subapical cercal lobule, and brown areas on lateral lobes of third tarsal segments; head with scape almost trice as wide as distance between antennal cavities, with upper rostral tubercle rather small and almost conical (but having slightly flattened dorsal surface), without distinct lower rostral tubercle, and with barely longitudinal eyes as well as rather long apical segments of maxillary palpi (these segments apically somewhat inflated and almost as long as each of two subapical segments of these palpi; Figs 1–3 ); pronotum with more or less flattened disc having posterior half barely inflated and with narrowly rounded posterior apex ( Fig. 2 ), but lateral pronotal lobes with posterior half distinctly lower than anterior one ( Fig. 3 ); tegmina long and very narrow, with normally developed both stridulatory apparatus (completely covered by hind pronotal lobe) and base of RS, with 3–4 distinct RS branches, and with narrowly rounded apices; hind wings distinctly protruding beyond tegminal apices; legs rather long and thin, with a pair of open longitudinal tympana on fore tibia, barely widened (in proximal part) middle tibia, and distinctly thickened proximal part of hind tibia; abdomen without specialization, except for its distal part which similar to that of Neodecma type species but with slightly less sinuate posterior edge of last tergite, with more fusiform cerci having distinctly shorter and subacute subapical lobules (these lobules directed dorsomedially and almost as long as directed backwards apical lobules), and with slightly wider and less notched apex of genital plate ( Figs 30–32 ). Genitalia with sclerotized part having a pair of moderately long but very thin and straight apical spines ( Fig. 6, 7 ). Variation. Second male with marks on majority of membranes in lateral tegminal fields, with more rounded apices of subapical (dorsomedial) cercal lobules ( Fig. 29 ), and with almost straight posterior edge of genital plate. Female . Coloration and structure of body as in males, but pronotum with somewhat shorter hind lobe ( Fig. 4 ), tegmina without stridulatory apparatus, subapical and apical tergites simple (subapical tergite without distinct posterolateral projections, and last tergite with only slightly convex posterior edge), cerci much smaller and without additional lobules; genital plate long and rather narrow, with slightly narrowed apical part having distinct rounded posteromedian notch between subacute posterolateral projections ( Fig. 33 ); ovipositor as in Fig. 5 . Length (in mm). Body: male 8–8.5, female 9; body with wings: male 17–17.5, female 21; pronotum: male 3.7–3.9, female 3.4; tegmina: male 13–13.3, female 16; hind femora: male 8.7–9, female 11.3; ovipositor 5.8. COMPARISON. The new species differs from D. ( N. ) elefani from Cambodia in the subapical (dorsomedial) lobules of the male cerci almost as long as their apical lobules ( vs these lobules are almost twice as long as the latter lobules; compare Figs 24–26 and 30–32 ), in the female genital plate having different apical shape (for comparison see Figs 27 and 33 ), and in the male genital sclerite having shorter and more straight apical spines. From D . ( N. ) orientale from Vietnam , the new species is distinguished by the female genital plate with a distinctly less deep and not angular posteromedian notch (see Figs 28 and 33 ), and possibly by the same male characters as from D . ( N. ) elefani ; however, I cannot exclude that the male from Vietnam , attributed to “ D . ( N .) elefani orientale ” by Gorochov (2012) , may really belong to D . ( N .) elefani but not to D . ( N .) orientale . From D . ( N .) bispinosa and D . ( N .) sjostedti , the new species clearly differs in the presence of well developed subapical and apical lobules in the male cerci (see the description of a male of D. sjostedti below).