OF THE AMAZON VALLEY. 
r>45 
15. Ithomia Vestilla, Hewitson. 
7 
Ithom 
Very abundant in the forests of the Upper Amazons. It is always seen in company 
with I. Antisao ; at Ega these two species seem to prefer eacli other's company to that 
of any of their kindred. At Fonte Boa there were two places in the forest peopled by 
*" '<b: one was tenanted only by L Illinissa and its allies, as already described; the 
other by I. Antisao, I. Vestilla, I. Virginia, and I. Onega. The same oceurred at St. Paulo : 
their societies were there increased by the attendance of I. Orimta. 
The hind-wing upper radial is deficient in the 6 , and is placed as a branch of the sub- 
costal a short distance after the cell in the ?. This is a further aj i proximat ion towards 
Hymenitis. 
16. Ithomia Primula, n. sp. 
tf 2, In size, shape, and markings, identical with /. Vestilla. It differs in colours. 
The hyaline parts of the wings in their centres are sulphur-yellow, as also the nervures 
which traverse them. In the fore wing there are two dusky lines, instead of one, extend- 
ing from the short black stripe at the end of the cell, namely, one accompanying the 2nd, 
and the other the 3rd median branch. The dark border of the hind wing is much wider 
than it is in L Vestilla. 
These points of difference are constant in all the examples (many hundreds) which I 
examined. I believe, however, that I. Primula and I. Vestilla have descended from the 
same stock at no remote period. The grades of modification have not been found, and 
probably no longer exist ; but allied species show, by their variations, a segregation in 
progress of two or more species from one stock not less dissimilar than the two species 
in question. The range of I. Primula does not coincide with that of L Vestilla. It is 
not found at Ega, which seems to be the head-quarters of I. Vestilla, but makes its 
first appearance further west, at St. Paulo, where it is more abundant than its sister 
species. 
The hind-wing upper radial is totally wanting in the <$ , and is placed, as a branch of 
the subcostal, a long distance beyond the end of the cell in the 2 . 
■ 
17. Ithomia JElia, Hewitson. 
Ithomia JElia, Hewits. Exot. Butt. Ithomia, fig. 7. 
As before stated, this species flies in company with the similarly coloured I. Illinissa, 
I. Gunilla, and I. Priscilla. It differs from them considerably in the neuration, the upper 
radial being placed as a branch of the subcostal after the cell in the 2 , although (unlike 
L Vestilla and I. Primula) it is present in the cf and connected with the cell by means of 
an upper disco-cellular nervule. 
It is found at Ega, and at various places in the forest thence to Fonte Boa. 
i 
18. Ithomia Orolina, Hewitson. 
Ithomia Orolina, Hewits. Exot. Butt. Ithomia, fig. 141, 6 . 
Eound abundantly at St. Paulo. 
Expanse 1" 7'". It is a very variable species; and one at least of the varieties appears 
4d2 
