OF THE AMAZON VALLKY. 545 



15. Itkojita \'estilla, Ilcwitson. 



Ilhomia Vcstilla, llcwits. Exot. Butt. //Aowu/, f. 17. 



W'l'v ahuiidant in the forests ol' tlic I'ppor Amazons. It is always seen in company 

 with /. Aii/isco; at Ega those two species seem to prefer each other's comi)any to tliat 

 of any of their kindred. At Fonte Boa there were two phiecs in the forest ))eopled I)y 

 Ithom'KC: one was tenanted only hy /. lUinissn and its allies, as already described; the 

 otlicr hv /. Aiitisdo, T.VcstUlii, J. firi/iii/f, and 1.0iic(j(i. The same occurred at St. i'aiilo : 

 their societies were there increased by tlie attendance of /. Oricud. 



The hind-wini,' upper radial is deficient in the <' , and is placed as a l)ranch of tlie sub- 

 costal a short distance after the cell in the 2 . This is a further approximation towards 

 Ilymoiilis. 



10. Ituomia rui.Mii.A, n. sp. 



c^ ?. In size, shape, and markings, identical Avitli /. Vcsdlhi. It difTers in colours. 

 The livaline i)arts of th(> win^s in their centres are sul])liur-y(>llow, as also tlu; nervures 

 which traverse them. h\ the fore wing there are two dusky lines, instead of one, i-xtend- 

 ing from the short black stripe at the end of the cell, naim^ly, one accompanying the 2nd, 

 ami the other the 3r(l median branch. The dark border of tlu; hind wing is much wider 

 than it is in /. J'cslilht. 



These points of dilfercnce arc constant in all the examples (many hundreds) whicii I 

 examined. I belieAc, however, that /. Frimida and /. J'cslUhi have descended IVom tin; 

 same stock at no remote period. The grades of modification have not been found, and 

 probably no longer exist ; but allied species show, l)y their vai'iations, a segregation in 

 progress of two or mori; sjxH-ies from one stock not less dissimilar than the two s])eci(S 

 in question. The range of/. I'rimula does not coincide with that of /. VcstUld. It is 

 not found at Ega, which seems to be the head-quarters of /. VrslHld, l)ut makes its 

 first appearance furtlier west, at St. Paulo, where it is more al)undant than its sister 

 species. 



The hind-winu' uppei' radial is totally wanting in llieo, and is placed, as a branch of 

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



17. IiiioMiA .Ei.iA, llfiwitson. 



Ithomiu yEliu, Ili'wits. ICxot. Hutt. llhoin'in, fig. 7. 



As before stated, this species ilies in company with the similai'ly coloured /. ///u/ins", 

 I. Gnnilld, and /. VriHcilln. It dilfers from them cimsidiu-ably in the neuration, the iqiper 

 radial being placed as a branch of the subcostal after th(> cell in the V, although .unlike 

 l.VcNiilhi and /. I'rii/i/'/") it is present in the J and connected with the ceil by means of 

 an iqiper disco-cellular nervule. 



It is found at l']ga, and at vaiious places in the forest thence to Eontc Hoa. 



18. rni():\nA Oi;omna, Ilcwitson. 



Ilhomia Orolina, liuwits. Kxot. Hutt. Ilhomia, fig. Ml, d ■ 

 Pound abundantly at St. I'atilo. 



Expanse 1" 7"'. It is a very variable si)ecies ; and one at least of tlie varieties appears 



1 J) 2 



