Bioacoustics of Aclella

Distribution. Southern Central America (from Nicaragua to Panama ) Emended diagnosis. Aclella can readily be recognized within Neoaclini by its smaller size, and by male FWs (very short, with only traces of stridulum on right FW) and genitalia (pseudepiphallic sclerite with a high median longitudinal crest, and most often not completely sclerotized; lateral processes often sclerotized; ectophallic apodemes very short). Small, flat species. Head with highly protruding eyes and deep transverse furrow at the base of the fastigium. Scapes about twice as long as wide; antennae with hair tufts in males. Pronotum wider than long. TI with a small inner tympanum. TIII subapical spurs as in all Neoaclini ( Desutter 1988 ) , except in A. matilei Desutter-Grandcolas, 2000 . Male: FWs very short, rounded; dorsal and lateral fields separated by two thick longitudinal veins (R and M), R lateral in location, M more dorsal, widely separated from thin CuA. Dorsal field with a functional stridulatory vein; stridulum complete, more or less distinct on the thickened right FW. Lateral field narrow with only one longitudinal vein (R). Male genitalia as in the genus definition ( Desutter-Grandcolas 2000 ), but the median process of pseudepiphallic sclerite very high, and either membranous along its longitudinal axis ( A. isthmiensis , A. matillei ), or entirely sclerotized ( A. troxalis , A. brevipennis Desutter-Grandcolas , n. sp. , A. nova Desutter-Grandcolas , n. sp. , Fig. 6 B–D); lateral processes of pseudepiphallus either membranous ( A. isthmiensis , A. matillei ), or sclerotized ( A. troxalis , A. brevipennis Desutter-Grandcolas , n. sp. , A. nova Desutter- Grandcolas, n. sp. ). Female apterous. Ovipositor shorter than FIII (except in A. brevipennis Desutter-Grandcolas , n. sp. ); apex slightly widened, without ornementation. Female copulatory papilla very small, more or less indented apically; ventral side strenghtened by an invagination. Coloration. Lateral lobe of pronotum dark brown, with or without a yellow anterior angle. Legs abundantly marked with yellow and brown, the tibiae ringed. Male: FWs brown, the thick longitudinal veins between the dorsal and lateral fields distincly yellow.