tucker: collecting insects. 83- 



LIST OF DIPTKRA. 



My opening remarks, together with the introduction to the 

 list of Hemiptera-Heteroptera, relate the circumstances under 

 which my collecting was done. A statement is also made 

 that all my specimens, whenever desirable, have been freely 

 added to the entomological collections of the University of 

 Kansas. 



Unless otherwise stated in the proper places, the arrange- 

 ment and nomenclature used in the preparation of this list of 

 the two-winged flies are adopted in accordance to Prof. J. M. 

 Aldrich's "Catalogue of North American Diptera." The 

 pleasure I had in association with Professor Aldrich a num- 

 ber of years ago, when he spent some time in research study 

 at the University of Kansas, induces me to express my high 

 estimation of his very helpful work as shown by this catalogue. 

 His recent assistance so promptly rendered in the determina- 

 tion of some of my specimens belonging to the family Doli- 

 chopodidse is hereby gratefully acknowledged. 



To Mr. D. W. Coquillett, through the courtesy of Dr. L. O. 

 Howard, of the Bureau of Entomology, United States De- 

 partment of Agriculture, Washington, D. C, I am deeply 

 indebted for very valuable and generous services which he 

 has repeatedly afforded me in the identification of specimens. 

 Other acknowledgments are accredited in the proper places 

 to specialists who have rendered assistance in naming speci- 

 mens belonging to certain families. Nearly all the specimens 

 of my early collecting were worked over almost in turn by 

 Dr. S. W. Williston, Mr. W. A. Snow, Prof. J. M. Aldrich, 

 and more recently by Dr. C. F. Adams, during the course of 

 their research studies at the University of Kansas. The de- 

 terminations made by myself have depended largely upon 

 comparisons of my examples with named specimens in the 

 University collection. 



As shown by the tabulated summary at the end of the list, 

 nearly half of the species taken by me in Kansas are new to 

 the state lists, the preliminary one being published by Dr. 



