Microcentrum

Da Silva Sovano, Rafael S. & Cadena-Castañeda, Oscar J., 2015, New species of Microcentrum Scudder, 1862 (Orthoptera: Tettigonioidea: Phaneropteridae) from Amazon rainforest, Zootaxa 3937 (3), pp. 591-600 : 598

Key to the species of Microcentrum from the Amazon rainforest

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