OF THE AMAZON VALLKY. 533 



CiMuis Nai'i;()GKm;s, iiov. i^^'Ti. 



Head small; palpi thinly clotli(>d with scabs, not hairy, the Icrminal joint slender and 

 projecting in front oftlie forehead. Antenntu moderately short, and distinctly tliiekened 

 towards the a])e\', fore-wint;- median nervure omittin!;- its first I)raneh at a short 

 distance from the root of tlii' wing-, hind-winu' lower and middle disco-cellulars rnniiiiiLc 

 at an obtnse annlc with the median ncrvnre ; both of the san\e length, directed obliipiely 

 towards the costa near the a))ex (a little less ohlicine in the V than in the d), straight 

 or very slightly bent, and withont recnrrcnt nervules : u])pcr disco-cellnlar in the 

 rather long, joining the subcostal near its terminatioTi ; in the 9 short, joininii- the 

 subcostal far from its termination. The costal and subeostal nervnres of the hind wini,^ 

 in both sexes, are free and wide; apart. Fore tibiie and tarsi in the •' aborted; IV'inur 

 not abbreviated: fore tarsi in the " slender filiform. 



The species of this uenns. such as were then known, were included by i)oul)ie(lay 

 under his genus Scis ; they are, however, perfectly distinct from .SV//.s- both in the wiii^:- 

 neuration and in the structure of the fore legs of the '. Most of the species mimic 

 corresponding species of the allied genus llJioiiiic, in the same way as the Lepialhlcs (Id. 

 In every locality where Ithoiiiuc are found in abundance, sjx-cies oi" Xajx'ogrucs arc 

 almost sure to b(> found also, mimicking one or more of them, the lllioniuc beini;' 

 always abundant, whilst their imitators are very generally scarce in individuals. The 

 resend)lance between species of the two grou])s is so great that it is dillicult to imagine 

 it not to be one of real aHinity ; the neuration of the wings, howevei- (a constant and 

 im])ortant character), is a sure guide in distinguishing theni. They are always represented 

 with this feature carefully marked in the beautiful figures given by ^Ir. Hewitson in his 

 • I'>xotic Butt(^r(li(>s.' 



* Collar (1)1(1 iriii(/-l((i}p('lti oi-diific ; anleiiital (^lub less (ihrnjilln Ihickoted. 



1. NAri;()f;i;xKs Cvriaxassa, ])ouI)leday. 



>«/.? ('ijrianassa, Douhld. and llewits. (ieii. Diuni. Lep. pi. Is. f". 1 . 

 Ithoiii'ia ('ijriundxsa, llewits. I'.xot. l?utt. Ithoin'ia, iiir. 'J.'). 



Occurs at Tara, in humid ])artsof the forest, abundantly, it is distributed over a u ide 

 area in the .Vmazon valley, l)ut in each locality it suliers niodilication. The amount of 

 this modification is not in i)ro|)ortion to geoi;Tapliical distance. Thus, at I'onte lU)a, 1.">(MI 

 miles to the west of I'ani, it scarcely dilfers from the I'ara ty|)e, having only the discal 

 area of tlu^ hind wings less transparent; but on the banks of the ('u])ari, only .")<•(( 

 miles west of rani (all th(>se places are in the same latitude), it e\i>ts only under the 

 form of a well-marked and constant local variety or race (oui' .\". ^Idcl/ilic) : a slioi-1 

 distance (1.")') miles) to the west of Fonte Boa, it occurs aiiain as a distinct local variety 

 (our X. TioKiHlhid). 



The species much resembles, when on the wing, C('i'(irnii(( yinoiiic, var. luo-ii. It is a 

 slow flier, and, alt houuli abundant in individuals, is confined to limited areas in the 

 districts where it is found. 



