128 ' iNovember, 
ever, in the vessel in which I had expected Yeatiana nothing appeared 
but such small specimens of nervosa. I could not possibly conceive 
that nervosa had two sorts of larvae so little resembling one another. 
I thus began to suspect that I had got hold of the species most closely 
allied to nervosa — the ultimella of Stainton, which suspicion turned 
out to be certainty when I referred to the description of the species in 
Stainton' s volume of the Insecta Britannica. By the help of that I 
was well able to separate my ultimella from nervosa (two of which 
species truly appeared amongst my ultimella). After this lengthy 
introduction, which, however, is not superfluous, since it shows how 
easily one can fall into error,* I pass on to the description of the larva 
of ultimella, and shall afterwards point out the points of difference 
between the imago of that species and that of nervosa. 
The larva of ultimella, of which I found no specimens smaller 
than those which were nearly half-grown, which were quite similar to 
the larger ones, is 20 millimetres long when quite full-grown, slender, 
cylindrical, very little thinner anteriorly than in the middle, thus rather 
different from the usual form of moth-larva^. The head is small, the 
feet also ; the creature is, however, very nimble, and can move up and 
down along the walls of its abode very quickly. The colour of the body 
is a rather dirty pale sea-green without markings, the ordinary spots 
are very small, dark brown, the head light brown, the anterior legs and 
the thoracic plate very pale brown. The pupa, which reposes in a thin 
white cocoon in the stem, is of a shining chestnut-brown ; it is com- 
pressed like all the pup® of Depressari(B, and has an obtuse tail-end. 
Thus one observes a considerable difference between the unicolour- 
ous larva of ultimella and the gaily marked, much more slender larva 
of nervosa, which will shortly appear in all its stages in the work of 
Sepp ; on the other hand, the perfect insects resemble one another 
closely, and wasted specimens are not eaoily distinguished with 
certainty. 
If one places a series of eight fresh-bred specimens of each species 
side by side, one sees that in both species the same variations of colour 
occur ; there are brownish-grey, yellowish-grey, bark-coloured, pale 
brown, and reddish specimens of nervosa, as well as of ultimella ; the 
design of the markings of the anterior wings is the same in both species. 
There is, for instance, a small dark spot at the base of the wing, along 
the uervures are small dark longitudinal streaks separated by pale 
scales, a very sharply angvdated pale streak indistinctly margined, and 
• To do this it only needed, for instance, tliat I, knowing the pupse of nervosa were to be found 
in the stems ot tliose jilants ot which the larvae had fed on the flowers, had delayed my search for the 
pupae so long that ultimella had also assumed the pupa state, I should then actually have had nervosa 
and ultimella coming out together, have overlooked the points of the diflereuce, which are not very 
perceptible, and have taken ail for one species.— P. C. T. S. 
