94 CHARLES W. LENG. 



acquaintance with the species of Onius inhabiting the High Sierra, 

 derived from personal collecting and most freely imparted, that por- 

 tion of my paper could not have been written. I have received 

 generous use of specimens of rare species from many friends, among 

 whom are my dear old friend, Charles Fuchs, of San Francisco, who 

 has loaned the types of Omus ambigmis, Oieindela perviridis and C. 

 lunalonga, and Mr. Knaus, Prof Wickham, Mr. H. W Wenzel and 

 Mr. Fred. C. Bowditch. 



A large number of my friends have helped me by the donation 

 of specimens and manuscript notes on their collecting experiences 

 and, in this connection, I am under obligation to most of those 

 whose names are already mentioned, and to Messrs. E. J. Oslar^ 

 George Coverdale, AVilliam S. Marshall, Norman Criddle, Frederick 

 Blanchard, Ezra J. Nolt, Lawrence Bruner, J. E. Desrochers, J. J. 

 Rivers, L. E. Hood, F. L. Washburn, G. W. Browning, A. Luet- 

 gens, C. Schaeffer, C Crozet, F. F. Crevecoeur, Roland Hayward, 

 F. E. Blaisdell, C. H. Roberts and J. D. Sherman, Jr. T also owe 

 thanks to Mr. Samuel Henshaw for the facilities afforded me in ex- 

 amining the types of Dr. Leconte, and to Dr. Henry Skinner for the 

 same kindness in connection with the collection of Dr. Horn. 



For my own part, I have diligently collected this family in the 

 Pine Barrens of New Jersey for the last three years, usually with 

 Mr. William T. Davis, and have thus acquired an acquaintance 

 with their individual variations in the field. I have compared my 

 specimens with the types in the Horn and Leconte collections and 

 with some of the types of Schaupp. I have taken the opinion on 

 some doubtful points of those students whose location gave them the 

 best opportunity of seeing the insects alive and in numbers. I have 

 read carefully all the printed matter in relation to the family that I 

 could find, and I trust the final result may prove satisfactory to the 

 reader. I hope also that he may be prompted to make known the 

 local races of Oieindela he meets, for the point I desire to emphasize 

 as the result of two years' study of this genus is that the difiference 

 between geographic races and species is one of degree only, and that 

 our knowledge of the genus cannot be completed by " lumping" the 

 described races because they are closely allied, but can be increased 

 by making known every constant difference that is exemplified by a 

 series of specimens. 



I have followed the existing practice by using the term " variety" 

 for forms that diflTered slightly, and I have refrained from describing 



