Dr. Hermann August Hagen, who since 1867 has been professor of entomology, died at his home on Putnam Avenue at four o'clock yesterday morning. Dr. Hagen was born in Konigsberg, Eastern Prussia, May 30, 1817. In 1867 he was invited by Professor Louis Agassiz to take charge of the entomological department in the Agassiz Museum of Comparative Zoology. Dr. Hagen was every-where recognized as one of the most distinguished authorities on entomology. Funeral services will be held at his house, No. 11 Putnam avenue, at 3 p. m. The pall bearers will be Professors Goodwin, Cooke, Toy, Shaler, Farlow, Mark, Lyon, and Dr. Walcott.