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Hi, I don't think it is Cha. humeralis or pectoralis: The mesopleuron is not black, which directly excludes humeralis; In case of yellow-dominant mesopleuron (as here), there is no black triangle on the katepisternum, so that also excludes pectoralis, which must have one. On the other hand this individual has the upper margin of mesopleuron black, forming a black line beginning narrowly on the upper margin, but widening behind until it meets the dark postnotum below the scutellum. Pleurae largely yellow. Postpronotal lobe at least partly yellow. We are thus dealing here with a Chamaepsila strigata (Collin, 1959). You didn't keep the specimen?
JOcelyn