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We Oey oped oi bittitataea pabent sibs} feneaeanl ¢ bapmeneifecrarrtts ene ay os THE UNIVERSITY OF ILLINOIS LIBRARY Oe ie ee MIDcopZ g sae hp ae sturn this book on or before the test Date stamped below. A arge is made on all overdue oks. University of Illinois Library L161—H 41 Digitized by the Internet Archive in 2011 with funding from University of Illinois Urbana-Champaign http://www.archive.org/details/genericclassific15ross ILLINOIS BIOLOGICAL MONOGRAPHS Vol. XV No. 2 PUBLISHED BY THE UNIVERSITY OF ILLINOIS UNDER THE AUSPICES OF THE GRADUATE SCHOOL URBANA, ILLINOIS 1937 EDITORIAL COMMITTEE Joun THEODORE BUCHHOLZ FRED WILBUR TANNER HARLEY JONES VAN CLEAVE UNIVERSITY OF ILLINOIS 1000—7-37—11700 tt PRESS 15 A GENERIC CLASSIFICATION OF THE NEARCTIC SAWFLIES (HYMENOPTERA, SYMPHYTA) WITH SEVENTEEN. PLATES BY HERBERT H. Ross Contribution No. 188 from the Entomological Laboratories of the University of Illinois, in Cooperation with the Illinois State Natural History Survey CONTENTS Introduction 7 Methods Meg wes. A Me ay & a, id (| IMiatetials Me 9S" -. «° es ce ee De ow 8 Morphology . : 9 Head and Aencntones : LR Be ee ae 9 Thorax and Appendages . ... . .... . 22, Abdomen and Appendages es) es ee 29 Phylogeny . . .. . : Vie Sa ee oe ee 33 The Superfamilies of Se A) Oe ee ee ee en ee ee Family-Groupings . 4... <-« 1. «+ +» « « « « dA Hypothesis of Genealogy . . . . cee we & 0 WanvalCharacters. 2 a. 6! as 2 aw oti ~