Insects. , 8987 
tinctly in the different varieties, but those mentioned above are the 
chief. 
Now another point of distinction between C. immanata and C. rus- 
sata is to be found in the outermost line of the broad central band; 
in both species this commences on the costa, at about two-thirds of 
the distance between the base and the tip, and runs across the wing 
for a little way with very small teeth, then shoots out into a large 
bilobed (sometimes, in C. russata, trilobed) tooth, which is followed 
by another not quite half as big, and lastly slants away to the inner 
margin, forming three more teeth not differing much in size; but the 
distinction is this, that in C. immanata these teeth, especially the 
largest of them, are more prominent and acute (Haworth’s “ fascia 
valdé producta, et utraque arguté irregulariter dentata”): in C. russata 
they are not so prominent, and are often rounded (“fascia externé 
minus producta”). 
The varieties of C. russata are almost endless, but those that have 
been named are as follows :— 
The type, C. russata (Haworth’s centum-notata) has the central 
portion of the large band white or pale gray. In concinnata of 
Stephens, a variety from Scotland, this central light portion of the 
band is narrower, and the borders of it become darker and more 
clearly defined. 
In saturata of Stephens the whole band is of a dusky gray, whilst 
the tawny markings of the wing have become a dusky brown. 
In perfuscata of Haworth the dark scales have so increased in 
number that the whole band has become nearly black, and the wing 
generally is so dusky that the markings lose much of their distinctness. 
In comma-notata of Haworth the central portion of the wing is of a 
tawny yellow, the lines which cross it there being of a deeper tint of 
the same colour. 
All these varieties, except concinnata, together with intermediate 
ones, Mr. Doubleday has bred from the eggs of a single moth. 
In C. immanata the typical form has the large band almost uni- 
colorous and dark, the central portion beimg but very little lighter than 
the edges (Haworth’s “fascia solida”); some specimens which were 
sent me by Mr. Hodgkinson from Westmoreland have the tawny 
markings of the wings also much mixed with black scales. In the 
variety marmorata of Haworth the central portion of the wing (as in 
C. russata) is white or very light gray, but the lines are all acutely 
angulated, as in C. immanata. 
Mr. Doubleday has shown me a variety from the Shetland Isles, in 
