PREFACE 1x 
182; copepods, 146, 146a; ostracods, 147; other Entomostraca, Herrick 
and Turner’s (’95) synopsis for Minnesota. 
In the case of several names not included in any of these works there 
are contradictory spellings, authors, etc., and we have used some name 
which we believe will be understood. 
In bringing together the illustrations, material assistance has been 
rendered as follows: 
Dr. S. W. Williston, loan of Figs. 30, 31, 32, 126, 132, 174, 186, 187, 188, 210, 
267, 269, 270, 271, 272, 273, 274, 275, 282, 283, 284, 285, 286, from his 
Manual of North American Diptera. 
Dr. F. R. Lillie and the Biological Bulletin, loan of Figs. 66, 67, 68, 69, 83, 84, 
85, IOI, 251, 252, 253, previously published by the author in the Biological 
Bulletin. 
Professor S. A. Forbes, the Illinois State Laboratory, and the State Ento- 
mologist’s Office, loan of Figs. 35, 36, 44, 45, 46, and 72, which appeared in 
Vol. III of the Natural History Survey of Illinois, and for electrotypes of 
Figs. 261, 262, 264, 265, 288, 289, 290, 291, 292, 296, 297, 301, 302, 303, 304, 
305, 306, which appeared originally in the Annual Reports and Bulletins 
of the State Entomologist and other state and national publications. 
Professor S. E. Meek and the Field Museum, loan of Fig. 37. 
Professor J. M. Coulter and the Botanical Gazette, loan of Fig. 115. 
Professor F. L. Washburn and the Minnesota State Entomologist’s Office for 
. electrotypes of Figs. 136, 137, 156, 189, 194, 211, 212, 213, 229, 256, 263, 
266, 268, 276, 277, 278, 293,298, 299, 300. 
Professor Vernon L. Kellogg, privilege of using Figs. 188, 270, 271, 274 from 
North American Insects, which appear also in Williston’s Manual of 
North American Diptera. 
Professor J. H. Emerton, privilege of using Figs. 207, 208, 224, 225 from Com- 
mon Spiders. 
Figures after Lugger appeared originally in Bulletins 55, 66, and 69 and the 
Fourth Annual Report of the Minnesota Agricultural Experiment Station. 
Figures after Marlatt, Riley, and Chittenden appeared originally in publica- 
tions of the U.S. Department of Agriculture; after Gorham, Smith, 
Jennings, and Reighard, in publications of the U.S. Fish Commission. 
The author is also indebted to Dr. J. P. Goode, Dr. Otis W. Caldwell, 
Dr. H. C. Cowles, Professor R. D. Salisbury, Professor C. M. Child, 
and Mr. M. M. Wells for assistance in editing the manuscript and read- 
ing proof. Mr. W. J. Gerhard rendered special assistance in the reading 
of the proof of the scientific names. 
It is evident from the number of persons who have assisted in the 
working over of material and the accumulation of the data on which this 
