OF THE AMAZON" VALLEY. 527 



Genus Sais, I)oul)l('(lay (jKirt). 

 Doiibltl. and llcwits. (icii. Diiirii. Lcpiil. p. L31. 



The type of Doubk'day's i;-{'iuis Sni-s is the Fapilij Iio,siiH<i oi' Cramor, a spocics which 

 (lillVrs in tlic structure of tlie fore leij's of tlie male and in the liind-wint,^ neuration from 

 th(> allied forms of Helicon id:,r. Uouhleday, however, made the definition of his u-enus 

 impossihle, by plaeini;' in it a series of species {S. Ci//-iin//i.ss-(i and others) which have no 

 resem])lance to i'. liosulia in the features mentioned. S. Cyrhniasna and its allies form 

 a distinct <;roup, which 1 have named yojjcogciics. Sais may l)e known hy the followiim- 

 characters. 



The hind-\\ ini;' lower disco-cellular in the f" runs in a line with the median nervure ; tiie 

 middle disco-cellular also runs nearly in the same straiiiht direction, l)n1 it is angular, and 

 emits a recurrent nervnle; the upper disco-cellular is short, and |)laced near tiic a])ex of 

 the wiuLi'. In the $ the ])osilion of the lower aiul middle disco-cellulars is the same ; hut 

 the u[)])er disco-cellular is wantiuL;-, the u])per radial hcinn' ])laced as a branch of the 

 subcostal, 'i'lie costal and subcostal nervures amalgamate foi- nearly the whol(> course 

 of the costal, as in the 'j;cnn^ Jfccliati/fis. The fore l(>ns cjf the J are (piite rudimentary ; 

 not only are the tibia* and tarsi reduced to a small knob, but the femur also is greatly 

 abl)reviated. in \\iv +* they arc nuich eloni;ated, and llie tarsi are liliform. The head 

 is very small; the antenna' ar(> very lom;' and slemh'i'. 



In this i>-enus the elongation of the hind-wini;- cell and the attraction of the radial 

 neuration within the domain of the median, reach their extreme point, in one sens(>. 

 iV'/.9 may be ccmsidered to be the hin'hest develo])ment of tlic llcliconidc (or Danaine) 

 ty])e on the American continent, in the stMise of rec;'din<;' fuiihest iVoni J)<(i/ui.s and tli(> 

 \ymphalida\ Th(> ii-roup Ili/n/cui/is exhil)its ])robably as ^-.'cat a deviation from the 

 Nymphalideous type as ,SV^/.s', but in Ili/meititis this deviation runs in a dili'erent and 

 nearly opposite direction. 



Sais llosALiA, Cramei'. 



PupUio Rosalia, Cram. Pap. Exot. t. 2\Ct, f. B. 



Ci'amer's figure, made from a Surinam specimen, represents the a])ex of the fore win<i' 

 of the same orange-lawny colour as the rest oi' the surlacc. 1 did not meet witli any 

 exam})les coloured in this manner. The species varies much accordim;' to locality, as is 

 usual with the lleliconiche; but the variations do not embrace all the individuals in each 

 locality; in other words, the senrciiation of race is not com|)lete. 



\ ar. 1. Pale oranirc-tawny ; apical ])art of the fore wim;' clear Iilack. 



All the examples met with in tiie Pani and Tajjajos districts were conforniable to tiii- 

 ty])e. I did not liiul it at all on llie I'pper Amazons. 



\'ar. 2. Dark oranti'c-tawny ; a])ical part of tiie fore winu' black, iiind winu' havinti- a 

 series of blackisli siiapes extendin.i;' IVoni the central macular \\\\\\ to the nnriiinal 

 lumiles. 

 Examples of this occurred at Eti'a, in company witii the follow ini'; :-- 



VOL. XXlll, \ 15 



