Fungiflora Y was applied to a deparaffinized section of a biopsied skin with scabies, a section of a brain infected with Cysticercus cellulosae, a section of a lung infected with Pneumocystis carinii and a section of a cockroach. The exoskeleton of the mite and the cockroach were stained with Fungiflora Y and were visualized as a greenish-blue fluorescence under incident illumination with ultraviolet light, whereas the Cysticercus cellulosae and the Pneumocystis carinii were not visualized at all. Fungiflora Y, which has been reported to stain fungi, is likely to detect arthropods exoskeleton in histological sections.