Bioacoustics of Microcentrum

1. Coloration mostly dark-green or light-green. Veins of tegmen not delineated. Costal vein without yellow spots or inconspicu- ous when present...................................................................................... 2 - Coloration light-green. Veins of tegmen delineated yellowish-green. Costal vein with conspicuous yellow spots................................................................................................... M. xavieri n. sp. 2(1). Anterior margin of the pronotal disc without projection....................................................... 3 - Anterior margin of pronotal disc with a triangle-shaped projection in the median portion.................... M. navigator 3(2). In dorsal view, stridulatory field dark-brown or black color........................................ M. lanceolatum - In dorsal view, stridulatory field without the color pattern above............................................... 4 4(3) Fastigium two times wider than antennal scape. Central ocellus larger than the antennal pedicel. Tegmen slightly lanceolate, expanding in the median portion of the costal margin......................................................... 5 - Fastigium as wide as antennal scape. Central ocellus smaller than the pedicel antennal. Tegmen completely lanceolate, without expansions in the median portion of the costal margin................................................ M. irregular 5(4) Tegmen semicoriaceus. Pronotal disc smooth................................................................ 6 - Tegmen coriaceus. Pronotal disc densely porous.................................................... M. nauticum 6(5) Medium size ( 50 mm ), tympanic area light-brown pigmented. Lanceolate epiproct, longer than wide. Stylus of the subgenital plate twice as long as a emargination in the posterior margin of the subgenital plate................. M. amacayacu n. sp. - Small size ( 35 mm ). Tympanic area without pigmentation. Triangular-shaped epiproct, almost as long as wide. Stylus of the subgenital plate four times longer than the emargination in the posterior margin of the subgenital plate...... M. surinamense