THE OHIO Naturalist PUBLISHED BY THE BIOLOGICAL CLUB OF THE OHIO STATE UNIVERSITY EDITORIAL STAFF EDITOR-IN-CHIEF—JOHN H. SCHAFFNER, A. M., M. S. ASSOCIATE EDITORS: _Zoology_—F. L. LANDACRE, B. Sc. _Botany_—F. J. TYLER, B. Sc. _Geology_—J. A. BOWNOCKER, D. Sc. _Archaeology_—W. C. MILLS, B. Sc. _Ornithology_—R. F. GRIGGS. ADVISORY BOARD: PROFESSOR W. A. KELLERMAN, Ph. D. Department of Botany. PROFESSOR HERBERT OSBORN, M. Sc. Department of Zoology. PROFESSOR J. A. BOWNOCKER, D. Sc. Department of Geology. Volume I. May, 1901 Number 7 COLUMBUS, OHIO _PRESS OF HANN & ADAIR_ [Sidenote: _THE OHIO NATURALIST_] A journal devoted more especially to the natural history of Ohio. The official organ of THE BIOLOGICAL CLUB OF THE OHIO STATE UNIVERSITY. Published monthly during the academic year, from November to June (8 numbers). Price 50 cents per year, payable in advance. To foreign countries, 75 cents. Single copies 10 cents. JOHN H. SCHAFFNER, _Editor_. F. J. TYLER, _Subscriptions_. R. F. GRIGGS, _Advertising Agent_. _Address_ THE OHIO NATURALIST, Ohio State University, COLUMBUS, OHIO. CONTENTS Variation in Syndesmon Thalictroides 107 _W. A. Kellerman_ Description of New Species of Stratiomyidae with notes on others 112 _J. S. Hine_ Ohio Batrachia in the Zoological Museum of the O. S. U. 114 _Max Morse_ The Promethea Moth, Callosamia promethea 116 _Herbert Osborn_ Meeting of the Biological Club 117 _Jas. S. Hine, Sec._ News and Notes 118 Entered at the Post Office at Columbus, Ohio, as second class matter. =The Ohio Naturalist= PUBLISHED BY THE BIOLOGICAL CLUB OF THE OHIO STATE UNIVERSITY ─────────────────────────────────────────────────────────────────────── Vol. I. MAY, 1901 No. 7 ─────────────────────────────────────────────────────────────────────── VARIATION IN SYNDESMON THALICTROIDES.