Chromatophores on the fourth, fifth and sixth abdominal segment of similar-size male adults (CL: 13.9±1.2 mm winter; 14.1±1.5 mm summer) and sub-adults (CL: 10.3±1.2 mm winter; 10.6±1.2 mm summer) were counted under a dissecting microscope (Zeiss Stemi DV 4A DR) after the animals had been exposed to light (to improve visibility of chromatophores).