Bioacoustics of Arenopsaltria dryas

Measurements. Range and mean (in mm) for 10 males , 10 females (includes smallest and largest specimens). Length of body (including head): male 24.5–31.0 (28.0); female (including ovipositor) 25.9– 32.7 (29.5). Length of forewing : male 31.8–38.3 (34.8); female 33.0–38.9 (35.5). Width of head (including eyes): male 9.9–12.9 (11.4); female 10.4–13.0 (11.7). Width of pronotum (across lateral angles): male 10.6–13.5 (12.0); female 11.3–14.6 (12.4). Distinguishing features. Closely similar to A. nubivena ( Walker, 1858 ) but usually larger (forewing usually above 30 mm , nubivena never reaching 30 mm ). Usually distinguishable by the yellow or pale orange costal margin of dryas that in nubivena is black or dark brown, rarely yellow. Further, the rostrum only reaches a little beyond the bases of the hind coxae in dryas but reaches at least to the apices in nubivena . These two species clearly differ in the shape of the male uncus that has the apical bifurcations almost parallel-sided and close together in dryas but triangular and widely spaced in nubivena . Differs from the other large Arenopsaltria species, A. fullo ( Walker, 1850 ) and A. exmouthensis sp. nov. , in having the rostrum reaching only to a little beyond the bases of the hind coxae (not reaching their apices or beyond), and a male uncus that is not sharply turned downwards distally. Males also differ in lacking a white pubescent transverse band on the abdomen, that is usually distinct in fullo and exmouthensis . Song ( Fig. 26 ). A coarse, whining buzz with a rapid but variable underlying pulse rate of ca. 450–850 pulses per second (sometimes in discernible doublets) and a peak sound frequency around 8 kHz. Males sing continuously for indefinite periods.

Etymology. Named from the Greek wood-nymphs known as Dryads who inhabited trees, each nymph living only as long as the tree she inhabited. Types. Holotype male (molecular voucher 06.AU. WA.WSS.09), 30.5 km W of Sandstone , 28º00.692'S 118º59.922'E , 57 m , 17.ii.2006 , Hill, Marshall, Moulds ( WAM ) . Paratypes as follows: WESTERNAUSTRALIA : 2 males , 2 females , 110 km S of Mount Magnet , 10.i.1989 , M.S. & B.J. Moulds ( DE ) . 2 males , 2 females , 110 km S of Mount Magnet , 10.i.1989 , M.S. & B.J. Moulds ; 3 males , 27.1 km SSE of Menzies , 29.91904°S 121.12127°E , 3.iii.2016 , D. Marshall & L. Popple , 013-0001 to 013-0003 ( LP ) . 36 males , 23 females , AU.WA.WSS, 30.5 km W of Sandstone , 28º00.692'S 118º59.922'E , 57 m , 17.ii.2006 , Hill , Marshall , Moulds ; 48 males (3 genitalia preps AR4, AR19, AR20), 21 females , 110 km S of Mount Magnet , 10.i.1989 , M.S. & B.J. Moulds ; 10 males , 9 females , Paynes Find , 140 km S of Mount Magnet , 20.i.1989 , M.S. & B. J. Moulds ; 2 males , 2 females , L. Giles , 46 km E Diemals H.S., 15.ii.2000 , on Acacia, P. Hutchinson ; 1 male , Menzies , 16.i.1978 , M. Powell ; 6 males , 3 females , 26 km S of Menzies , 10.ii.2006 , M. Hanlon , M. Powell . 2 males (molecular vouchers 09.AU.WA.YAZ.02 and 03), 50 km W of Yalgoo , 28º25.144'S 116º10.393'E , 358 m , 11.ii.2009 , K. Hill & D. Marshall ; 1 male (molecular voucher 06.AU. WA.EMG.05 and song recorded), 23 km E of Mt Magnet , 28º09.227'S 118º04.241'E , 450m , 16.ii.2006 , Hill , Marshall , Moulds. ( MSM ) . 2 males , 2 females , 110 km S of Mount Magnet , 10.i.1989 , M.S. & B.J. Moulds ( PH ) . 2 males , 2 females , 110 km S of Mount Magnet , 10.i.1989 , M.S. & B.J. Moulds ( WAM ) .