The alders and willows growing along the streams and in moist situations supported a large association of Hemiptera. The species listed below for these plants, also yellow birch and white pine, are common to a number of habitats.
On willows (Salix spp.): Idiocerus amabalis, I. pallidus, I. alternates, Macropsis viridis, 111. basalis, Scaphoideus immistus, Thamnotettix cockerelli, Empoasca smaragdula, E, aureo-viridis, Trioga salicis, Pemphigus tesselata, Cyntus discors, Corythucha elegans, C. mollicula, Lygus atritylus, L. hirticulus, Lygidea rubecula obscura, Platytylellus lasiomerus, Phytocoris salicis, Lopidea media, Diaphnidia pellu cida, Ceratocapsus pumilus, Orthotylus dorsalis, Plilophorus amoenus, Deraeocoris borealis and Anthorcoris borealis.
On yellow birch (Betula lutea Michx) : Clastoplera obtusa, Oncopsis sobrius, O. cognates, 0. fitchi, 0. minor, Typhlocyba querci, Psyllia striata, P. carpinicola, Euschis tus tristigmus, Banasa dimidiata, Meodorus lateralis, Ischnor rhynchus geminates, Corythucha pallipes, Eremocoris ferns, Lygus horticulus, L. fagi, Deraeocoris borealis, Hyaloides vitri pennis, Pilophorus amoenus, Diaphnidia provancheri, D. capi tata, Orthortylus translucens, Plagiognathus fuscosus, Aradus robustus, A. quadrilineatus, Aneurus inconstans, Anthocoris borealis, Podisus sereiventris, P. modestus and P. maculiventris. On White Pine (Pines Strobes Aphrophora parallela, Empoasca coccinea, Elidiptera slossoni, Psyllia carpinicola, Phytocoris fulvous, Plagylytus lurid us, Deraeo coris pinicola, Pilophorus amoenus, Aradus niger and Tetraphleps osborni n. sp.
In general the Hemiptera of the region may be considered as conspicuous members of every habitat studied. There are many aquatic species and some of the surface inhabiting species occur in countless millions (Rheuntatobates rileyi, Trepobates pictus and Metrobates hesperitts) scattered over miles of the surface of Cran berry Lake and the Oswegatchie River. The shore dwelling species and the forms occurring in the swamps, bogs, marshes and meadows present a large array while the forest species occurring under bark, on the leaves and every possible part of the tree make up an aggregation that cannot possibly be overlooked by anyone giving the least attention to the complex association of the woodland. In general the greater number may be counted as
plant feeders, but there are many predaceous forms that prey upon other insects and many of course that sustain themselves on decaying vegetation in such manner as to have little influence on other organisms. However, no species can be considered as entirely independent of the other forms in the complex association of which they may be only a very minor part.
From an economic standpoint the majority of the Hemiptera must be counted injurious as by far the greater number are destructive to useful vegetation and especially to important forest trees. This may be considered especially true of the Homoptera, all the species so far as known being dependent upon growing plants for their food; none are aquatic in the true sense but several species have become adapted to bog- or swamp-plants where they are subject to very humid conditions or at times must be able to undergo temporary immersion.
Acknowledgements: The authors wish to express here, briefly, their sincere appreciation to those who have kindly assisted in these studies. We are indebted to Dean ill. F. Moon, New York State College of Forestry, for the opportunity of carrying on these investigations. The drawings have been made by Mr. J. R. Sim of Ashtabula, Ohio. Mr. A. E. Fivaz has taken many of the photo graphs and assisted in the field work. Director W. E. Sanderson of the State Forest Camp has very kindly permitted us to use boats, canoes, tents and other equipment of the Summer Camp. The plants have been determined by Dr. W. L. Bray, Syracuse University, and Dr. H. P. Brown, New York State College of Forestry. The map of Cranberry Lake region has been drawn from a map of the Adirondacks by the Conservation Commission of New York State by Mr. Paul W. Stickel under the direction of Professor H. C. Belyea. Dr. M. W. Barrows of Ohio State University identified the spiders. For the determinations of in sects thanks are due as follows : Dr. II. H. Knight of the Uni versity of Minnesota, the Miridae; Dr. H. B. Hungerford of the University of- Kansas, the Corixidae ; Dr. H. M. Parshley of Smith College, the Aradidae; Mr. H. G. Barber of Roselle Park, N. J., the Lygaeidae; and Mr. J. R. de la Torre Bueno of White Plains, N. Y., many of the Saldidae.