Bioacoustics of Stethobaroides

Redescription. The original description of the genus ( Champion 1908 , p. 399) is modified as follows, with my additions underlined: Mandibles decussate; rostrum arcuate, moderately long, antennae inserted at or slightly behind middle, club acuminate-ovate; prothorax transverse, subconical, abruptly constricted and tubulate in front, feebly bisinuate at base, median lobe emarginate; scutellum free, oblong, narrow, parallel-sided; elytra rounded-triangular, with obliquely truncated humeri, leaving upper portion of mesothoracic epimera exposed, sharply crenate-striate, separately rounded at apex, interstrial sulci absent; pygidium exposed, transverse, subvertical, sexually dimorphic; prosternum deeply sulcate, sulcus widening to anterior coxae, then narrowed and margined between them, basal process short; anterior coxae separated by about one half, intermediate and posterior coxae by nearly twice, their own width; mesosternum depressed, exposed, connate with metasternum; ventral segments 1 and 2 connate in their median third; femora sublinear, unarmed; tibiae strongly unguiculate; tarsal claws minute, narrowly separated; body subrhomboidal to ovate, moderately arched, glabrous above (one species with microscopic setae). The following gender-specific traits apply: Male with rostrum stout, antenna inserted at mid-length; sternite 7 with two rows of plectra for stridulation ( Fig. 3 ), sternite 8 with distal 2/3 protruding beyond elytral apices, last ventrite with setose median depression and with apical margin gently sinuous, basal ventrites depressed; penis elongate and of moderate size, endophallic sclerites absent, tegmen with apodeme wide and short ( Figs. 4 , 5 ); female slightly more elongate than male, with rostrum longer, slenderer and antenna more basally; exposed part of pygidium formed by short sloping apical portion of sternite 7, last ventrite without median depression but frequently with divergent sculpture and distal margin ( Fig. 6 ), basal ventrites convex; spermathecal duct as long as bursa, inserted ventrally near base of bursa, sternum 8 distally with even row of notably long setae ( Fig. 7 ).