Bioacoustics of Aglaothorax poecilonotum

Stridulatory file. (n=5) length 2.9–3.5 mm , 88–103 teeth, tooth density 30.3±4.2 (25.7–35.5) teeth/mm. Song. (n=5) Common song type of small Aglaothorax . Pulse trains of length 40 ms are repeated at a rate of 4.42± 0.45 s- 1. Mean peak frequency is 18.74±3.02 kHz; high frequency recording equipment places the peak frequency within the ultrasonic at 22.80 kHz. Echemes are variable in length and contain 11–40 (mean 26±11) pulse trains. Silent intervals between echemes are brief at 8±4 s (range 5– 12.5 s ). At the type locality males were first heard singing at 2100 h and peak acoustical activity began after 2330 h. Karyotype. (n=3) 2n ♂ =24 ( 22t +XtYt) paratype T21-18 (S21-22). Recognition. Morphology, geography. The male paraproct process has an apical mesal tooth unlike the generally subapical tooth of most Morsei Group species. The male titillator is long and bowed, unlike the short slightly curved titillator arm of A. constrictans and the morse Group. The strong lateral curve to the titillator and lack of a basal constriction on the titillator arms together eliminate A. oreibates from consideration, which has less lateral curvature and a basal constriciton. The A. poecilonotum female subgenital plate has digitiform lateral processes that are broad at base and rather blunt at the apex, unlike the long, narrow, and sharp processes of A. dactyla . The A. poecilonotum subgenital plate lateral processes round onto the caudal margin of the plate unlike the right angle observed in female A. diminutiva . Female A. poecilonotum may be morphologically indistinguishable from those of A. acrolophitus and A. oreibates . The range of A. poecilonotum is restricted to the Santa Ynez Mountains.