328 Mr. W. Arnold Lewis on 
of the features of the new arrangement is to place newt 
together those two genera in the group called Nocturnt. 
Again (p. 385), “I find it impossible to draw a line 
between the types which form Stephens’ two families, 
Notodontide and Arctiide. The structure of the mouth 
will not assist in the inquiry, because Pygera, Cerura, 
&c., amongst the Notodontide have the maxille, and even 
the maxillary palpi, developed as strongly as in Spilosoma 
and Arctia, whilst there is as great a variation in the 
transformations of the genera of either group as there 
is between the respective species of the two groups; 
hence I have followed Latreille in keeping them under 
one family.” Those genera which Mr. Westwood felt 
constrained to include in one family are now, by the new 
arrangement, separated by hundreds of species, includ- 
ing the whole group of Geometre. And again (p. 363), 
“Tt seems unquestionable that Sphine (or the hawk- 
moths), Bombyx (or the feather-horned full bodies), &c., 
are, as Linneus considered them, amongst the primary 
types.” Neither Sphing nor Bombyx is, in the new 
arrangement, acknowledged as a type at all. 
But to proceed. Not long after Mr. Westwood’s book 
was written, came Mr. Doubleday’s first “‘ Synonymic 
List,” proposing the first instalment of the great changes 
which were at hand. The first pages (1-8) were 
published in October, 1847, and they went as far as the 
genus Toeniocampa (in the Noctuce), proceeding in the 
Linnean order through Ihopalocera (so called in the 
List), Sphinges (so called), and Bombyces (so called). In 
the following month (November, 1847) some more pages 
(9-16) came out, carrying the list through the remainder 
of the Noctue well on into the Geometre. Thus Mr. 
Doubleday, lke all who preceded him, adopted the 
old order, leaving no doubt that (1) Sphinx, (2) Bombyz, 
(3) Noctua, (4) Geometra, was then, according to his 
view, the correct arrangement. In August, 1849, there 
was a complete re-issue of pp. 9-16, apparently for the 
express purpose of taking in the Pyrales between the 
Noctuce._ and Geometre. ‘This order, at all events, was 
observed on pp. 13, 14, and 15 of the re-issue; and, 
accordingly, Mr. Doubleday’s first list, when concluded 
at the close of 1849, showed the following order: Rhopa- 
locera, Sphinges, Bombyces, Noctue, Pyrales, Geometre. 
At this time, therefore, the change was not very great or 
