ACKNOWLEDGMENTS. 11 



Ms." as the author, some of which he never described. But 

 to him and his published works I owe much of my early knowl- 

 edge of the classification of the group. 



Mr. E. P. Van Duzee, then of Buffalo, N. Y., now Curator 

 of Entomology in the Museum of the California Academy of 

 Sciences, is a leading American authority on Heteroptera who 

 identified many species for me in former years and who has 

 determined others and loaned me numerous specimens during 

 my preparation of this work. 



To Prof. H. G. Barber, of Roselle, N. J., the leading 

 authority on American Lygaeidae, I am indebted for many 

 favors, not only in the identification and loaning of specimens, 

 but in the solving of numerous knotty problems of synonymy 

 and nomenclature. 



As in my works on Coleoptera and Orthoptera, so in this, 

 my friend and fellow naturalist, W. T. Davis, of Staten Island, 

 N. Y., has been of great service. Anything I wanted which he 

 could furnish in the way of specimens or literature he gladly 

 sent, and he also furnished many notes on distribution and 

 habits. 



The work in its present form would not have been possible 

 had it not been for Wm. J. Gerhard, of the Field Museum of 

 Natural History at Chicago. He possesses one of the best pri- 

 vate collections of Heteroptera in this country, which was 

 placed at my command, and also an excellent library of the lit- 

 erature of the group from which he loaned me many scarce 

 papers by foreign authors which I could not secure elsewhere. 



C. S. Brimley, Entomologist of the North Carolina State 

 Department of Agriculture, who is much interested in Heter- 

 optera, placed at my disposal their entire collection, and sent 

 me many specimens from that section of the country which I 

 otherwise might not have seen. 



Prof. J. J. Davis, Chief of the Department of Entomology 

 at the Purdue Agricultural Experiment Station, secured for 

 me much literature and furnished numerous specimens from 

 the Station collection. 



Mr. W. E. China, Curator of Hemiptera in the British Mu- 

 seum at London, England, sent me numerous specimens from 

 the collection in that Institution, and compared others for me 

 with the rare types therein. 



Others who aided either by the loan or identification of 

 specimens, or both, were Dr. Herbert Osborn, Columbus, Ohio, 



