OF THE AMA7,ON VALLEY. 541 



am inclined to think that all throo aro modifications of one and the same species. They 

 may have arisen in separate localities, and liave hecn al'ter^vards l)rou<;ht l)y altered 

 distrihiition into contact ; l)ut il is not necessary to suppose tliis, as the UIiuiu'kc always 

 pair with their exact counterparts, so that separation is prohahly not reijuisite to aid the 

 segrei^ation of races, when tlie variations have once arisen. 



The flocks of Butterflies, all of the same colour, and iindistinguishalde from one another 

 •when on the wing, which fly together in the same; dry hollows of the forest at J'onte Boa, 

 comprise, besides the three preceding species, also a fourth Ithouiin (/. ^EVm, belonging 

 to a difl'erent section of the genus) and Xapoo(jencs ErclUa. A LcpldHs (1*1. I.\ . 

 fig. G), coloured in the same way, occurs in company with /. lliniissd, at Ega ; and 

 an Ithomeis* {I. aio'antidcd, belonging to the widely diU'ennit family Ei'iicuiUUe) flies 



* Itiiomkis, nov. gcii. (raiiiily Ekycimd.i,). 



Allied to Lywnn'.? and Phe!es. Facies of Iffioniiri, having similar elongated fore wings and wliilisli spots near tlie 

 apex, imitating the transjiarent ones usual in the species of that genus. 



Head clothed with even, soft hair-scales : palpi extremely short, thick, thinly and smoothly clad with scales. 

 AntenniT moderately slender, elongate, not pale-ringed ; thickened towards the apex into an elongate, slender, com- 

 pressed cluh. Fore wing elongate, apex more or less rounded : suhcostal and median nervures straight ; the former two- 

 branched, emitting its first branch just liefore, its second much beyond, the end of the cell : upper disco-cellular very 

 short ; middle disco-cellular mtudi longer, transverse ; lower disco-cellular slanting outwards, nearly |)erfectly tubular, 

 joining the median beyond its second I)ranch. llind wing snboval ; upper radial appearing as a continuation of tlie 

 subcostal, the terminal ])art of the subcostal -placed as a branch of it ; middle disco-cellular short, transverse ; lower 

 disco-cellular in the same relative position as in the fore wing. Legs thinly clad with scales, stout ; fore legs of the cf 

 densely h.airy ; fore legs of the 2 long, thinly clad, claw-joint very large, oblong-oval, claws minute. 



In the shape and clothing of the liead, palpi, and antenna', this genus is extremely similar to Lijmnna, Pheles, 

 Zeonia, Themone, and the allied genera. Its nearest relationship is with Pheles, from which it ditTers in the second 

 suhcostal branch of the fore wing lieiug emitted after, instead of before, the end of the cell. The s])ecies of Pheles 

 have somewhat the aspect of Ithomiie and Staluchtes, but those oi Ithomeis have a much closer rcsenihlauce to those 

 genera. 



\. Ithomeis ai^rantiaca, n. sp. 



S . Kx]iausc 1" '.)" . Fore icinf/ : nhnre, black : a long triangular spot at the base of the cell, a smaller one just 

 after the cell, a rounded one between the 1st and 2ud median branches, and a belt of three similar spots across the 

 wing, between the radials and the '2nd and .'?rd median branches, whitish ; the costal margin at the base, a large spot 

 between the median and i)ostmcdian nervures, and a narrow, somewhat regular, submarginal band beginning on the 

 costa, running ])arallel to the outer margin, arched, and reaching the hind margin, orange. Benea/h, the same. 



Hitiff winff : ahnrr, orange, the whole margin narrowly, and a large triangular spot on the basal part of the disk, 

 black. Beneath, the same, except that there are two white spots at the base of the wing. 



Antenna? black. Body black ; forehead silvery white ; abdomen beiu-atii orange. 



Found at Caii-ara, between Ega and Fonte Boa, iu com])any with Ithumia .E/ia, which it very much resei:d)led on 

 the wing. 



2. Itiiomkis Stalaciitina, n. sp. 



<S ■ Expanse 1" 8". Fore trint/ : nhove, black; the costal and hind margins near the base slightly tinged with 

 tawny orange ; a long stripe within the base, a speck beyond the cell, a spot lietween the 1st and 2nd nu'dian branches, 

 and a short macidar crossbelt, jdaced rather more than halfway between the cell and tlu* ai>ex, white. Beueiith, the 

 same, except that the tawny-orange marks near the base appear as distinct stripes, and that there is a short, narrow, 

 obscure tawny belt parallel to the outer margin. 



Jlim/ winff : above, black ; a broad tawny-orange stri|)e begins at the base, runs along the .abdmuinal margin, 

 bending before reaching the anal angle, and continues thence to the apex ; there is also a dull tawny-orange s])ot iu the 

 middle of the costal margin. Beneath, the same, exce]>t that there are two white spots at the base. 



Body and anteuim; black ; forehead silvery white ; abdomen beneath orange. 



