Holcocerus holosericeus is a species of moth of the family Cossidae. 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 13âÂÂ19 mm for males and 17âÂÂ23 mm for females. The wings are pure white. Adults have been recorded on wing from April to May and in December in Israel.