OF THE AMAZON VALLEY. 54-5 



15. Ithomia Vestilla, Hewitson. 



Ithomia Vestilla, Hewits. Exot. Bntt. Ithomia, f. 17. 



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 each other's company to that 

 of any of their kindred. At Fonte Boa there were two places La the forest peopled by 

 Ithomice : one was tenanted only by I. Illinissa and its allies, as already described ; the 

 other by I. Antisao, I. Vestilla, I. Virginia, and I. Onega. The same occurred at St. Paulo : 

 their societies were there increased by the attendance of I. Oriana. 



The hind-wing upper radial is deficient in the c? , and is placed as a branch of the sub- 

 costal a short distance after the cell in the ? . This is a further approximation towards 

 JSymenitis. 



16. Ithomia Primula, n. sp. 



c? ? . In size, shape, and markings, identical with I. 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 ceU, 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 I. Vestilla. 



These points of difference are constant in all the examples (many hundreds) which I 

 examined. I believe, however, that I. Frimula 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 J. Vestilla. It is 

 not found at Ega, which seems to be the head-quarters of I. Vestilla, but makes its 

 fijst 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 c? , and is placed, as a branch of 

 the subcostal, a long distance beyond the end of the cell in the ? . 



17. Ithomia tElia, Hewitson. 



Ithomia j^lia, Hewits. Exot. Butt. Ithomia, fig. 7. 



As before stated, this species flies in company with the similarly coloured /. Jllinissa, 

 I. Gunilla, and I. Friscilla. It differs from them considerably in the neuration, the upper 

 radial being placed as a branch of the subcostal after the cell in the ? , although (unlike 

 Z. Vestilla and I. Frinmla) it is present in the cJ and connected with the ceU by means of 

 an upper disco-cellular nervule. 



It is found at Ega, and at various places in the forest thence to Fonte Boa. 



18. Ithomia Oeolina, Hewitson. 



Ithomia Orolina, Hewits. Exot. Butt. Ithomia, fig. 141, 6 . 

 Found abundantly at St. Paulo. 



Expanse 1" 7'". It is a very variable species ; and one at least of the varieties appears 



4d 2 



