01360nas a2200133   4500008004100000245009200041210006900133300001200202490000800214520092600222100002201148700001501170856004101185       1982                        eng d00aSong Structure and Description of Some Costa Rican Katydids (Orthoptera: Tettigoniidae)0 aSong Structure and Description of Some Costa Rican Katydids Orth  a287-3140 v1083 a<p>The physical features of the calling songs of a dozen species of Tettigoniidae from Costa Rica are recorded and analyzed. A new species, Cocconotus pusillus, is described from the cloud forest.</p>
<p>Several forms from the understory of lowland rainforest utilize high-Q (sinusoidal) carrier frequencies in the ultrasonic range and to this end the sound generating regions of the tegmina are uniquely strengthened. Relative to other katydids, these insects show what may be adaptations for avoidance of predatory bats: elongate antennae, lowered thresholds for elicitation of defensive behaviour and a severely curtailed signal emission time. It is proposed that reduced signal dura tion has placed a selective premium on localization efficiency during pair formation. The ultrasonic pure tone carrier, functioning in conjunction with highly directional ear slits, may be an adaptation to enhance localization.</p>
1 aMorris, Glenn, K.1 aBeier, Max  uhttp://www.jstor.org/stable/25078301