VI PKErACE. 
by the graver immediately on the copper, without the intervention of 
any copy. 
The Systematic Catalogue of British Insects by Mr, Stephens 
has been the guide throughout the Work ; but where the generic 
names have been subsequently altered in the Illustrations of British 
Entomology, the alterations are constantly noticed in the third 
column. 
It was originally intended strictly to confine the Work to one 
figure only of each species ; nor was this plan departed from till after 
the first Plate was finished, and the second and third in progress. 
It was then observed that the great dissimilarity between the Male 
and Female of several species amongst the Butterflies, made it quite 
necessary to figure some of the latter. This has caused an unavoid- 
able confusion in the numbering of the second and third Plates; 
but it is presumed that the benefit arising from the deviation will 
more than counterbalance the apparent defect. It must be observed, 
that where the Male and Female are both figured, the number is 
always repeated. Thus, in PL II. 40 a + the male ; 40 the female : 
again, PI. II. 58 a + the male : 58 PI. III. the female. 
Each page of the work (as in the Index Testaceologicus) is divided 
into columns. The first column contains the Linnaean names, to be 
found in the twelfth edition of the Systema Naturcc : — the names 
printed in Italics mark the species discovered since the time of 
Linnaeus. The second column contains the English names. The 
third, the synonyms of British Authors, and the new genera as 
adopted by Mr. Stephens and others. The high numbers precedmg 
each generic name in small capitals refer to the Systematic Catalogue 
of British Insects, (where the Lepidoptera begin with No. 5794,)* 
and the name to the species in the first column : Thus Gonepteryx 
Rhamni of Stephens is the Papilio Rliamni of Linnseus ; the CoUas 
Europome of Stephens is not a Linnaean species, being printed in 
Italics; the Colias Hyale of Stephens is the Papilio Hyale of 
Linnjeus, and so on. The fourth column gives the Habitat of the 
Insect, and the time of the year when it may be found. 
As a guide to the comparative size of the diff'erent Insects, a 
* Where no such number precedes the name, the Iii^eet has been discoverjil tuice the 
publication of the Catalogue in 1829. 
