of the Amazon Valley. 343 
dilated obliquely outwards. The colours are the same; but the upper side 
has no purple gloss, and the irroration beneath is much coarser. 
Upper Amazons, at St. Paulo; very rare. 
Genus SIDERONE. 
167. Siderone Marthesia, Cramer. 
Papilio Marthesia, Cramer, 191 a,B, 2. 
Cramer’s figure of Papilio Marthesia is evidently made from an 
imperfect specimen, in which a great part of the hind wing was torn ; 
for it does not represent the deep emargination of the abdominal 
apical margin, and the direction and colour of the row of spots are 
wrong; the line of spots in perfect examples bends towards the 
anal angle, and the colour is bluish. I found two examples near 
Santarem, and believe the insect to be the female of a fine scarlet 
male resembling the well-known S. Jde. The following is a descrip- 
tion of the male :— 
6. Expanse 3". Closely resembling in form and colours S. Ide (Fabr.). 
Hind wing less rounded outwards, and apex of fore wing destitute of 
tawny spot. Above, deep rich black; fore wing with a basal spot and 
submedian belt, and hind wing with a discoidal stripe a little beyond the 
middle, rich scarlet; anal margin of the hind wing, and a curved, sub- 
marginal row of spots, bluish grey. Beneath, the same as in the female 
(Cramer, fig. B); fore wing rather darker, and clouded with rufous towards 
the base. 
Ega, Upper Amazons. I have seen specimens also from Cayenne 
in Dr. Boisduval’s Collection. 
168. Siderone Mars, Bates. 
Siderone Mars, Bates, Proc. Ent. Soc. Lond. 1860. 
, Hewitson, Exot. Butt. Sid. f. 3, 4. 
I took one example only of this superb species. St. Paulo, Upper 
Amazons. 
169. Siderone Isidora, Cramer. 
Papilio Isidora, Cram. 235 a, B, EF, F (dQ). 
Itys, Cram. 119 F, & (var. @ ). 
Generally distributed throughout the Amazons region, in thinned 
parts of the forest. Both sexes appear to be very unstable in the 
form of the wings (degree of falcation, &c.) and in markings. 
170. Siderone Zethus, Westwood. 
Siderone Zethys, Westwood, Dbld. & Hewits. Gen. p. 321, note. 
Para. This seems to be distinct from S. Isidora, being smaller, 
VOL. II. 2c 
