INTRODUCTORY. 



The only system of practical bibliography is one which admits of an indefinite number • 

 additions. The books to which the index finger of the bibliographer should point, especial 

 in scientific departments, are not those published fifty, or even five, years ago. They are tl 

 works of the present, not the musty tomes of the past. A system which can do this, and ( 

 it perfectly, is the title-slip system lately adopted by the American Library Association coope 

 ating with the most prominent American publishers, and just coming into practical operath 

 in the United States. It is for the purpose of furnishing title-slips prepared similarly to tho: 

 of the American Library Association (see The Library Journal, 1878, v. 3, p. 113-115), th. 

 these references are compiled. In order to put them in a form convenient for distribution 

 foreign libraries, to specialists and to I ibliographers, a few copies have been printed as Speei 

 Bibliographies. On account of their separate paging and heavy-type heading these Sped 

 Bibliographies can be bound together in alphabetical order. 



% 

 For the first of this series of Special Bibliographies, Mr. Samuel Henshaw, of Boston, Mas: 



has prepared a list, supposed to be complete to date, of the entomological writings of Dr. Jol 



L. LeConte, of Philadelphia. Dr. LeConte lias kindly examined the copy prepared for tl; 



list, and has furnished the reference to the only article (no. 75) not seen by, Mr. Henshaw. 



The bibliography of general American entomology can be found chiefly in the following work 



Hagen's Bibliotiiec.v entomologica, Leipzig, v. 1,1862; v. 2, 1863. [Literature up to 1862. 

 Packard's Record of American entomology, Salem, Mass. [Published yearly from 18< 



to 1872; includes an annoted list of entomological papers from 1863-1871.1 

 Psyche. Organ of the Cambridge Entomological Club. Cambridge, Mass., 1874-1879, v. 1- 

 [Contains "a list of all writings upon entomology published in North America a 

 of all writings upon North American entomology, from the beginning of the ye 

 1874, with a brief note (descriptive) of the contents of each."] 



"The Entomological Writings of John L. LeConte," as herewith presented, contains inai 

 references not found in the above mentioned works. 



Corrections and additions will lie thankfully received by the editor, as the title slip- in 

 be corrected immediately. 



GEORGE DIMMOCK. 



Cambridge,^MasS., U. S. A., 1 November, 1ST-. 



