Insecis. 8909 
from a low meadow luxuriant in sorrel, and carried a mile or two to a 
dry hill-side clothed with Helianthemum. There the female deposited 
her eggs, and the young larve, after searching in vain for sorrel, at 
last put up with the Helianthemum, and lived upon it for generations ; 
and, as Helianthemum is much less juicy than sorrel, they became a 
diminutive race, just as sheep and cows fed on mountains are smaller 
than those always pasturing in valleys. The non-roving character of 
the larve and the sluggish flight of the imago would both tend to keep 
them in the locality where accident had first deposited them, though 
but a short distance from their former home; and this isolation, from 
the necessity of breeding in, would still tend to dwarf the race, as 
noticed by Wollaston, Darwin and others. That this may have been 
the origin of I. Geryon is confirmed by the fact that, although Heli- 
anthemum is now its undoubted food, it will eat sorrel—its old taste 
for acids is not lost: “ Naturam expellas furcé tamen usque recurret.” 
The next notice is at Zool. 8468, where Mr. F. Beauchamp says, 
“On the question whether I. Geryon be a variety or a species, I will 
only observe that we get the normal I. Statices in plenty within a mile 
or two of the hills where I. Geryon abounds, but that I never took 
them in company, nor did I ever take any form intermediate between 
them.” There is nothing here at variance with the theory just pro- 
posed, but rather in accordance with it. Mr. Beauchamp says he 
never took them in company; but Mr. Newman, after quoting Stau- 
dinger in the last passage, says “ J believe that all three British species 
of Ino occur in company in Sussex, more especially on the south 
coast.” This, of course, would be inconsistent with the above theory, 
and would go far to prove the distinctness of I. Geryon as a species, 
but it is not asserted as a fact, and requires confirmation. 
The next passage is at Zool. 8606, a description of the larva of 
I. Statices by Mr. Newman, which I shall compare with a description 
of the same larva by M. Guenée, kindly sent me by. Mr. Doubleday. 
There is a general agreement between these two descriptions, but 
there are the following details noticed by Mr. Newman and not by 
M. Guenée :— 
1. That the black papillz, described by M. Guenée as covering the 
- whole body, are not discernible on the warts. 
2. That a few long silky hairs are mixed with the bristles clothing 
these warts. 
Also the following noticed by M. Guenée and not by Mr. New- 
man :— 
1, A black spot on each incision along the dorsal vessel. 
