Holcocerus holosericeus is a species of moth of the Cossidae family. It is found in Kazakhstan, Mongolia, Kyrgyzstan, Uzbekistan, Tajikistan, Turkmenistan, north-western China, Afghanistan, Iran, Israel, Jordan, the United Arab Emirates, Egypt, Algeria, Tunisia, Libya and Morocco. The habitat consists of deserts. The length of the forewings is 13–19 mm for males and 17–23 mm for females. The wings are pure white. Adults have been recorded on wing from April to May and in December in Israel.