Bioacoustics of Mutonemobius marmoratus

Description MEASUREMENTS . See Table 4 . Females are larger than males. HEAD ( Fig. 20A–B ). Rounded, bulbous, approximately 10% taller than wide in frontal view. Compound eyes measuring one third of head height in their longest dimension, black. Ocelli present, white. Head colour a very dark brown/ black throughout, except for very conspicuous pale stripes arching over compound eyes from anterior margin of pronotum to scapes of antennae, and for faint pale patches either side of rostrum and along edges of labrum and clypeus. Head mostly glabrous, smooth and shiny, except for few stout bristles on vertex and on frons on sides of rostrum. Antennae: scapes with longitudinal brown and yellow stripes; flagelli pale brown. Labial and maxillari palps uniform dark brown and sparsely hairy; terminal segment of maxillary palps covered in short, dense hairs. THORAX ( Fig. 20C ). Pronotum 25% wider than long, widest at centre, narrowest at anterior and posterior edges. Colour marbled yellow and dark brown. Cuticle smooth, with sparse, short hairs, barely noticeable. Strong bristles on lateral lobes and on anterior and posterior edges. WINGS ( Fig. 20C ). Forewings present, vestigial only, almost twice as wide as long; identical in males and females, lacking stridulatory apparatus in males. With longitudinal veins only; colour alternating yellow and dark brown longitudinal stripes. Hindwings always absent. LEGS . Fore and middle legs banded yellow and brown; with sparse strong bristles on all sides. Posterior legs variegated pale and brown. Tibia I with two ventral spurs at apex, subequal in length. Auditory tympana absent. Tarsomere I-1 bearing two rows of short spinules ventrally. Tibia II armed with three long spurs at apex, subequal in length; two ventral and one dorsal on posterior side. Tarsomere II-1 bearing two rows of short spinules ventrally. Femur III glabrous and of variegated colour inside; covered in hair outside, especially on dorsal surface. Femur III outer surface marked by a longitudinal line along its whole length, parallel to lower edge, about ⅓ from femur lower edge and ⅔ from upper edge. Area above longitudinal line marked with alternating yellow and brown diagonal stripes; area below longitudinal line with diagonal stripes only in proximal half, variegated pale and brown in distal half. Tibia III armed with four subapical dorsal spurs on inner edge, three subapical dorsal spurs on outer edge, although one out of seven individuals have four subapical spurs on outer edge also, in both sexes. All apical and subapical spurs pale at base and at apex, brown in between; covered with short hairs. Length of outer ventral apical spur on Tibia III 80% to 85% that of inner ventral apical spur. Length of outer apical spur on Tarsomere III-1 70% that of inner apical spur. ABDOMEN ( Fig. 22C–D ). Marbled yellow and brown. Dorsum covered in relatively dense, thin tomentum throughout. MALE TERMINALIA . Subgenital plate trapezoidal, with sparse hairs, curled upwards and wrapped around genitalia. Suranal plate with a petal-shaped lobe projecting backwards from posterior margin and covering genitalia from above ( Fig. 20D ). Internal genitalia internal as in Fig. 21. FEMALE TERMINALIA ( Fig. 20F–H ). Subgenital plate small, trapezoidal. Ovipositor 60% of body length; straight and slender; smooth throughout. Lateral valves divaricating at apex. EGGS ( Fig. 20E ). Brown; approx. 1.5 mm long and 600 µm wide.