CATALOGUE OF INSECTS. 5 



cited that the general character of the surroundings under which the 

 insects occur may be more clearly set out. 



Finally, it becomes my very great pleasure to acknowledge the 

 assistance that I have received from entomologists and collectors, not 

 only of our own State, but of the neighboring States of New York 

 and Pennsylvania. The members of the Newark Entomological 

 Society, the American Entomological Society, the Feldman Social 

 and the New York Entomological Society have all placed at my dis- 

 posal their individual and collective experience, and to all of them I 

 wish to make grateful acknowledgment. Special mention must be 

 made of those gentlemen who have kindly prepared the manuscript 

 in certain of the orders or families from their own experience, sup- 

 plemented by data that I supplied to them ; thus Mr. Wm. H. 

 Ashmead, Assistant Curator of Insects in the United States National 

 Museum, has prepared in its entirety the chapter upon the Hymen- 

 optera ; Mr. C. W. Johnson, Curator of the Wagner Free Institute, 

 in Philadelphia, has prepared in its entirety the chapter on the 

 Diptera. Professor Herbert Osborn, of Columbus, Ohio, has pre- 

 pared in its entirety the list of Homoptera. Professor P. P. Calvert, 

 of the University of Pennsylvania, has prepared the list in the 

 Odonata. Dr. Wm. G. Dietz, of Hazleton, has furnished the list of 

 the Tineina in the Lepidoptera. Professor Lawrence Bruner, of the 

 University of Nebraska, has kindly revised my manuscript in the 

 Orthoptera and has determined a great many species. Dr. Harrison 

 G. Dyar, of the United States National Museum, has kindly made 

 suggestions on the general arrangement and classification of the 

 Lepidoptera, and while I have not accepted his views in all cases, 

 nevertheless the general system used in this work is that suggested by 

 him. In the Coleoptera, Mr. H. W. Wenzel, of Philadelphia, has 

 been of the greatest possible assistance, and it needs only a glance 

 over the list to see how much it is indebted in that order to the tire- 

 less work done by him on the insect fauna of our State. It would be 

 a pleasure to me to mention here individually all those who have 

 been so kind as to aid in the preparation of this work, which is far 

 beyond the compass of any one individual, so far as the accumulation 

 of facts is concerned ; but as this is not convenient, special acknowl- 

 edgments are made under the separate orders or in the explanation 

 of abbreviations used. 



It has been aimed to make the list as complete as possible, and to 

 give only actual records ; but it has not been found practical to carry 

 out this ideal in all respects. Collections in some of the orders are 

 still so fragmentary that a mere list of what has been actually taken 



