Bioacoustics of Brachyphisis viettei

Description. See Jin & Kevan, 1992 : 29. Description complement. In addition to generic characters. Male. Wings. ( Fig. 67–68 ). Left FW with 88–102 (average: 96) lamellar teeth ( Fig. 69 ). Terminalia. Paraproct. Only slightly exceeding the epiproct ( Fig. 51, 53 ). Cerci. Bent inward in the middle ( Fig. 51 ). Subgenital plate. With a wide emargination (i.e. inter styli width; Fig. 52, 53 ); lateral margins moderately converging towards distal end. Genitalia. Epiphallus cephalic lobe distal end broadly rounded (dorsal view; Fig. 56 ); with a sub apical enlargement of the neck (more or less distinct depending on the specimen; moderately visible on Fig. 53 ); the general curvature in side view varies on different specimens and seems not a reliable character ( Fig. 55 ). Bioacoustics. Fig. 73 . Males are singing by night hours usually on the higher branches of endemic Sapotacae. Males are sometimes moving while calling. Above 20°C, the call of B. viettei consists of long echeme-sequences (> 1 min); echeme-sequences are made of disyllabic echemes repeated at the rate of 4.7– 8.3 disyllabic echeme/s (average: 6.4); disyllabic echeme duration: 57–82 ms (average: 71.9 ms); interdisyllabic echeme interval: 39–103 ms (average: 75.8 ms). Echeme sequences are seldom interrupted by short breaks. Trains of waves forming the disyllabic echemes are not resolved in natura with our recording setup (n = 5 specimens recorded). The fundamental peaks between 17–20 kHz.