The Orchestra Nocturne: Description For Six New Katydid Species From India (Orthoptera: Tettigoniidae) Author Tiwari, Chandranshu Department of Environmental Studies, Satyawati College, University of Delhi, Delhi- 110052, INDIA. Author Diwakar, Swati Department of Environmental Studies, Faculty of Science, North Campus, Chhatra Marg, University of Delhi, Delhi- 110007, INDIA. text Zootaxa 2024 2024-01-30 5405 2 227 245 http://dx.doi.org/10.11646/zootaxa.5405.2.4 journal article 10.11646/zootaxa.5405.2.4 1175-5326 10603343 6943C3BB-F5BC-4B8B-91F4-EB069E1D8D5E Key to species of Hexacentrus ( Serville 1831 ) from India 1. Prosternum and Mesosternum unicolor, femora in the general coloration.......................................... 2 - Prosternum and Mesosternum blackish brown, femora brownish at apex.......................................... 3 2. Mirror on the tegmen rhomoboid in shape, body yellowish green, third and fourth joint of tarsi blackish brown ( Wang and Shi 2005 : Fig 1 , 4 )................................................................. H. expansus (Wang and Shi) - Mirror on the tegmen oviform........................................................................... 4 3. Antennae concolorous, Male tegmen with angular apex....................................................... 5 - Antennae discolorous, Male tegmen rounded at apex......................................................... 6 4. Male tegmen inflated.................................................................................. 7 - Male tegmen not inflated............................................................................... 8 5. Fore femora armed with 5–6 ventral spines on the inner margin, stridulatory file with 32 teeth, subgenital plate with styles curved and converging apically ( Farooqi and Usmani 2018b : Fig 7I ; 8A.............. H . bifurcatus (Farooqi and Usmani) - Fore femora armed with 18–30 ventral spines on inner and outer margin, stridulatory file with 20–23 teeth, styles diverging from each other ( Ghosh et al. 2023 : Fig 11 A–D, 12)....................................... H. tiddae (Ghosh et al. ) 6. Hind wings are shorter and hidden under tegmen, stridulatory file with 37–40 teeth with 4 large teeth in the middle ( Ghosh et al. 2023 : Fig 3A–B , 5 )........................................................... H. khasiensis (Ghosh et al. ) - Hind wings same size or larger than tegmen, stridulatory file homogenous with 40 teeth ( Ghosh et al. 2023 : Fig 7 A–B , 9)................................................................................... H. ashoka (Ghosh et al. ) 7. Stridulatory file homogenous, Ovipositor straight, base thickened ( Ingrisch and Shishodia 2000 : Fig 143–144)............................................................................................ H. major (Redtenbacher) - Stridulatory file with 2–3 large teeth, ovipositor curved, rather longer than the body................ H. mundus (Walker) 8. Male tegmen short and broad, stridualtory file moderately sulcate with <30 teeth and with>3 large teeth................ 9 - Male tegmen long and narrow, stridulatory file moderately sulcate with>30 teeth and 3 large teeth at the distal end ( Farooqi and Usmani 2018b : Fig 1 ; Inagaki et al. 1990 : Fig B,D)...................................... H. unicolor (Serville) 9. Stridulatory file with 5 large teeth towards the distal end, Subgenital plate long with elongated, wide, longitudinal median furrow, lateral ridges well developed, apical margin with rounded excision; styles straight, diverging apically, chirping call ( Inagaki et al. 1990 Fig A, B; Farroqi and Usmani 2018b: Fig 4I )............................... H. japonicus (Karny) - Stridulatory file with 4 large teeth in the middle, Subgenital plate long with elongated, wide, longitudinal median furrow, lateral ridges well developed, apical margin with rounded excision; with styles curved, converging apically, buzzing call ( Fig 1G, 1I ).................................................................................... H. sylvanus sp. nov