No. 6.— NEW ENGLAND SAWFLIES OF THE GENUS 
TENTHREDELLA ROHWER.^ 
BY MARCUS T. SMULYAN, PH. D. 
Introduction. 
The studies herein contained are based principally upon the 
collections of the American Entomological Society, the Boston 
Society of Natural History, Doctor A. D. MacGillivray, Urbana, 
Illinois; Doctor G. C. Crampton, Amherst, Massachusetts; the 
United States National Museum; Peabody Museum, Yale 
University; the Museum of Comparative Zoology, Harvard 
University; Cornell University; Mr. A. P. Morse, Wellesley, 
Massachusetts; the Peabody Museum, Salem, Massachusetts; 
and the Maine, New Hampshire, Connecticut and Massachusetts 
Agricultural Experiment Stations. Practically all of the still- 
existing types in North America of the species concerned here, 
and of many others, have been examined, and in a number of 
cases where the types are lost, metatypes, or at least authentic 
specimens, were seen. The types of nigricollis and leucostoma 
(W. F. Kirby) I have not examined, as both are in the British 
Museum, but Mr. S. A. Rohwer, of the United States National 
Museum, who has seen them, was kind enough to advise me in 
regard to them. 
The writer wishes to express his indebtedness and thanks to 
the persons and institutions above mentioned, for the loan of 
material for which Professor Fernald was kind enough to assume 
responsibility, or for the privilege of examining their collections. 
Especially do I wish to thank Doctor A. D. MacGillivray for the 
courtesy and favors shown me during my stay in Urbana, Illinois, 
and Mr. E. T. Cresson of Swarthmore, Pennsylvania, for items of 
information and for his interest in the work; Doctor Henry 
Skinner and Mr. E. T. Cresson, Jr., of the American Entomological 
' This paper forms a part of a thesis for the degree of Doctor of Philosophy at 
the Massachusetts Agricultural College, Amherst, Massachusetts. The work 
was done under the direction of Professor H. T. Fernald and Doctor G. C. 
Crampton of the Department of Entomology, and my sincere thanks are due 
both these gentlemen for their aid and guidance. 
