24 EEPOET OF THE SECEETAEY. 



The twelfth article in the series above enumerated is the biblio- 

 graphy of conchology, which has been prepared to avoid the neces- 

 sity of repeating bibliographical references in the different manuals 

 just enumerated. It is intended to give, first, an account of all the 

 articles or works of American authors, relative to conchology in 

 general, and secondly, those of foreign writers relative to the con- 

 chology of North America. 



All the species referred to by authors are enumerated after the 

 title of each article, and such references to the page and date of 

 description are given as will enable any species to be quoted from 

 the bibliography itself without the necessity of referring to the origi- 

 nal. A complete index of authors, and of all the species mentioned, 

 placed at the end of the work, will greatly facilitate its use. The 

 first part of this 'work, embracing the writings of American authors, 

 forms an entire volume of the Miscellaneous Collections of upward of 

 700 pages, of which 400 are already stereotyped. 



Another series of works belonging to the Miscellaneous Collections 

 is intended to facilitate the study and the advancement of the science 

 of entomology, of which the several articles are the following: 



1. Instructions for collecting and preserving insects. 



2. Catalogue of the described Diptera (flies, mosquitoes, &c.) of 

 North America, by Baron Osten Sacken. 



3. Catalogue of the described Lepidoptera (butterflies, moths, 

 &c.) of North America, by Dr. Jno. G-. Morris. 



4. Classification of the Coleoptera (beetles, &c.) of North America, 

 by Dr. Jno. L. LeConte. 



5. Synopsis of the described Neuroptera (dragon flies, &c.) of 

 North America, with a list of the South American species, by 

 Hermann Hagen. 



G. Synopsis of the described Lepidoptera of North America. Pt. 

 1, Diurnal & Crepuscular Lepidoptera, b}^ Dr. Jno. G. Morris. 



7. List of the Coleoptera of North America, with descriptions of 

 new specie:', by Dr. John L. LeConte. 



8. Monographs of the Diptera of North America, by H. Loew, with 

 additions by Osten Sacken. 



0. Catalogues of Homoptera and Ilemiptera (chinches, roaches, 

 ,&c.) of North America, by P. E,. Uhler. 



10. Descriptive catalogue of the Hymenoptera (bees, wasps, &c.) 

 of North America, by Dr. Henri DcSaussure. 



These have all been described in previous reports, and have all been 



