I.Ain'AL FORMS OF COLEOPTEEA 



logue''* for the European larvae, and in Junk's catalogue^ "^^^ for the 

 hirvac from otlier countries. 



]t is impossible to adequately acknowledge and express our ap- 

 preciation of the great amount of assistance we have received from 

 many colleagues and friends interested in our project. The late 

 Dr. E. A. Schwarz followed our work with interest and generous 

 assistance, and we are deeply indebted to Doctor Schwarz for his 

 suggestions as to the systematic position of many forms. From time 

 to time in the last more than fifteen years Messrs. E. C. Rosenberg, 

 J. P. Kryger, and K. L. Henriksen have presented one of the authors 

 Avith many important Danish larvae, now included in the collection 

 of the National Museum, without which it would have been impos- 

 sible to characterize and figure the larval types of several families 

 and subfamilies. An important collection of larvae from Finland, 

 acrpiired last year through Prof. Uunio Saalas, has been very useful 

 for the final revision and completion of the keys. From the British 

 ]\Iuseum of Natural History a number of exceedingly interesting 

 forms have been presented by Dr. C. J. Galian and Dr. K. G. Blair. 

 Dr. G. de Lapouge from France has donated a valuable collection of 

 carabid larvae. Many meloid larvae and other larvae of great im- 

 portance have come from Dr. A. Cros. Mr. J. C. M. Gardner has 

 sent a great many named larvae from India ; Dr. 0. H. Swezey, 

 larvae of Proterhinidae and other rare larval types from Honolulu ; 

 Dr. J. Bequaert. larvae of Drilidae and other remarkable larval types 

 from Yucatan, Mexico, Liberia, and Belgian Congo; and Dr. J. G. 

 Needham, a Chinese larva which appears as a transitional type be- 

 tween the Psephenidae and the Ptilodactylidae. Last but not least 

 we have had available for daily study the large collection of beetle 

 larvae in the United States National Museum, which gradualh' has 

 been accumulated by numerous North American entomologists since 

 the year 1896, when C. V. Riley transferred to the National Mu- 

 seum a small biological collection which he brought with him from 

 ]\[issouri. Now the collection contains invaluable systematic ma- 

 terial from North and South America, collected and reared by E. A. 

 Schw^arz, H. G. Hubbard, H. S. Barber, A. D. Hopkins and Ms 

 many associates, F. H. Chittenden, George Dimmock, C. C. Hamil- 

 ton, J. A. Hyslop, J. J. Davis, A. B. Champlain, T. E. Snyder, R. 

 T. Cotton, R. J. Sim, and many other entomologists, and it is also 



'° L. V. Heyden, E. Reitter, J. Weise : Catalogus Coleopterorum 

 Europae, Second edition. 1906. 



^*^ E. "W. Junk, editus a S. Schenkling: Coleopterorum Cata- 

 logus. 



4 



