OF THE AMAZON VALLEY. 
527 
Genus Sais, Doubleday (part). 
Doubld. and Hewits. Gen. Diurn. Lepid. p. 131. 
• The type of Doubleday's genus Sais is the Fapilio Rosalia of Cramer, a species which 
differs in the structure of the fore legs of the male and in the hind-wing neuration from 
the allied forms of Heliconidae. Doubleday, however, made the definition of his genus 
impossible, by placing in it a series of species (S. Cyrianassa and others) which have no 
resemblance to S. Rosalia in the features mentioned. S. Cyrianassa and its allies form 
a distinct group, which I have named Napeogenes. Sais may be known by the following 
characters. 
The hind-wing lower disco-cellular in the d runs in a line with the median nervure ; the 
middle disco-cellular also runs nearly in the same straight direction, but it is angular, and 
emits a recurrent nervule; the upper disco-cellular is short, and placed near the apex of 
the wing. In the $ the position of the lower and middle disco -cellulars is the same ; but 
the upper disco-cellular is wanting, the upper radial being placed as a branch of the 
subcostal. The costal and subcostal nervures amalgamate for nearly the whole course 
of the costal, as in the genus Mechanics. The fore legs of the 6 are quite rudimentary ; 
not only are the tibia? and tarsi reduced to a small knob, but the femur also is greatly 
abbreviated. In the 2 they are much elongated, and the tarsi are filiform. The head 
is very small ; the antennae are very long and slender. 
In this genus the elongation of the hind-wing cell and the attraction of the radial 
neuration within the domain of the median, reach their extreme point. T " 
Sais may be considered to be the highest development of the Heliconide (or Danaine) 
type on the American continent, in the sense of receding furthest from Vanatsznd th, 
Nymphalida, The group S^menUis exhibits probably as great a deviation from the 
Nymphalideous type as Sais, but in Symenitis this deviation runs m a different and 
nearly opposite direction. 
In 
Sais Rosalia, Cramer. 
Papilio Rosalia, Cram. Pap. Exot. t. 246, f. B. 
Cramer's figure, made from a Surinam specimen, represents the apex of the fore wing 
L/iamer s n me, m surface. I did not meet with any 
of the same orange-tawny colour as the rest ol tne sunace. j 
examples coloured in this manner. The species varies much accordmg to£»W* as is 
usual with the Heliconidae ; but the variations do not embrace all the mdividuals in each 
locality ; in other words, the segregation of race is not complete. 
Var 1 Pale oranee-tawny ; apical part of the fore wing clear black. 
AlhZt^l met w'ith m the Para and Tapajos districts were conformable to tins 
type. I did not find it at aU on the Upper Amazons. 
Va, 2. Dark orange-tawny; apical part of the fore wing black tod wing havin 
series of blackish stripes extending from the central macular vitta to the mammal 
S a 
lunules 
Examples of this occurred at Ega, in company with the follow 
4 B 
VOL. XXIII. 
