NATURAL SCIENCE [January 



actitude, and no new species being described except such 

 as are represented in the British National Collection. 



" (4) No catalogue of specimens will be included, but a somewhat 

 full and minute account of the range of the species, re- 

 ferences to all ' types,' to collectors' names when known, 

 and to series of specimens of which an account is given in 

 published works. 



" (5) The ' type' of each genus will be indicated by being placed 

 after the reference to the genus, whether it be retained, 

 treated as a sub-genus or synonym. 



" (6) The references to the species will be confined to the 

 original reference, to one for each synonym, with dates 

 of publication, to the best figure of the species, to the 

 best description and figure of the early stages, and to such 

 faunistic works and catalogues as are of most general use 

 and importance. 



" (7) Local races will be treated as sub-species under sub- 

 headings, with their own references and synonymy. 



" (8) Each genus, and all the more prominent sections of genera, 

 will be illustrated by process blocks in the text, showing 

 the facies of a typical species of the genus or section, 

 and all the more prominent details of structure on which 

 the genus is founded. 



" (9) An atlas of coloured 8vo plates will also be issued, giving 

 half-figures of as many as possible of the species which 

 have never before been satisfactoiily figured, especially of 

 ' types ' in the British Museum. This will be issued in 

 parts, as is convenient, and will be sold separately from 

 the volumes ; it will contain no letterpress except the 

 explanation of the plates, giving the names of the species 

 figured, reference to the pages of the volume in which 

 the descriptions will be found, and the country where 

 the species will be found. 



" (10) The order of the families will, in the main, follow that 

 adopted by Mr E. Meyrick in his recent work on British 

 Lepidoptera, and, commencing with the Syntomidae, will 

 work down througli the Arctiadae and Agaristidae to the 

 Noctuidae and Lymantriadae ; then, beginning again with 

 the Saturniadae and their allies, will work downwards by 

 the Sphingidae to the Notodontidae, Geometridae and 

 Uraniadae ; then by the Lasiocampidae, Limacodidae, 

 Cossidae, Psychidae and Castniadae to the Zygaenidae ; 

 then by the Drepanidae and Thyrididae to the Pyralidae, 

 Sesiadae and Tineidae ; and ending with the Hepialidae 

 and Micropterygidae. 



