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I have in my collection specimens of T. ambusta with 4 longitudinal black lines on mesonotum, with 2 submedian stripes and outer ones broken at suture into spots, and with a pair of enlarged and broadly fused stripes leaving only a small orange midline. The shown specimen is only a little bit darker with central disc of mesonotom completly black. No doupts that T. ambusta is variable in coloration of mesonotum. Frons of the figured specimen is typically orange accept occuput, in P. usta only the anterior part is orange but dark and thickly gray dusted posteriorly.
Xylo