Hemicellulase is an enzyme found in scolytids (bark and ambrosia beetles) which feed on trees. Hemicellulase breaks down wood products, including cellulose.
Borror, D.J., C.A. Triplehorn, and N.F. Johnson. 1989 An introduction to the study of insects. 6th edition, Harcourt Brace College Publishers, New York.