THE MOUNT DESERT REGION" 19 



ACKNOWLEDGMENTS j 



In preparing this list I am under great obligations to a i 



number of specialists for their generous assistance in deter- ; 

 mining material. Through the kindness of Dr. L. 0. Howard, 



Messrs. S. A. Rohwer, R. A. Cushman, A. B. Gahan, and ; 



C. F. W. Muesebeck named many of the sawflies and parasitic i 



Hymenoptera. The ants were determined by Dr. W. M. \ 



Wheeler; the Chrysididae, by Dr. L. H. Taylor; the ■ 



Eumenidae, by Dr. J, Bequaert; the Sphecidae, by Dr. H. T. J 



Fernald; some of the bees, by Mr. H. L. Viereck; the j 



Megachile, by Mr. T. B. Mitchell, and the Psammocharidae j 

 and many of the Neuropteroids, by Mr. Nathan Banks. 



In the Diptera I have had the assistance of Dr. C. P. Alex- \ 



ander on the Tipulidae ; Dr. J. M. Aldrich, on the Tachinidae j 



and Sarocophagidae; Mr. M. C. Van Duzee, on the Dolichopo- ] 



didae; Prof. C. T. Brues, on the Phoridae; Mr. J. R. Malloch, j 



on the Anthomyiinae, and Mr. E. T. Cresson, Jr., on the \ 



Ephydridae. Messrs. H. C. Fall and C. A. Frost have deter- | 



mined a number of Coleoptera; Mr. A. P. Morse, a number j 



of Orthoptera; Prof. Herbert Osborn, a number of Homop- j 



tera ; Dr. H. M. Parshley and Dr. H. B. Hungerford, a number j 



of Hemiptera, and Dr. R. H. Howe, Jr., a number of Odonata. j 



Mr. P. J. Chapman has revised the list of Psocidae, and j 



Mr. H. S. Peters, the Mallophaga. ' 



To the Journal of Economic Entomology I am indebted j 



for the picture of Prof. H. C. Fernald. I 



j 



Charles W. Johnson. I 



