OF THE AMAZON VALLEY. 
565 
Fig. 3- Leptalis Theono'e, var. Lysino'e (Hewitson. Described by this author as a distinct species. The 
white fore part of the hind wing is merely a sexual character^ and is hidden by the fore wing in 
the natural position of the wings). — Ega, Upper Amazons, 65° W. long. 
Fig. 3 a. Sialachtis Phadusa, var. Duvalii (Perty). — Ega, Upper Amazons, 65° W. long. 
The resemblance between these two is very great, when flying in their native woods. The 
Leptalis is quite unlike any Ithomia found in the whole region, and is supposed to have been 
adapted to the Stalachtis, because its original variations were in the direction of Stalachtis, and 
this disguise equally well served the purpose of preservation with that of an Ithomia. 
Fig. 4. Leptalis Theono'e, var. — Ega. Described by Hewitson as a variety of L. Lysino'e, Exot. Butt. 
Leptalis, fig. 13. 
Fig. 5. Leptalis Theono'e, var.— Ega. 
Fig. 6. Leptalis Theono'e, var. — Ega. This has considerable resemblance to Ithomia Illinissa, fig. Ga. 
Fig. 7- Leptalis Theonoe, var. — St. Paulo. 
Fig. 8. Leptalis Theonoe, var. — Ega. 
Fig. 9. Leptalis Theono'e, var. — St. Paulo. 
These six varieties occurred only in single or very few examples : they imitate (with the 
exception of fig. 6) no other insect, and are supposed to be either simple variations (sports) or 
remnants of the steps of modification which have led to the various complete adaptations in the 
two districts where they are found. In any case (since it is impossible to suppose that each is 
an unmodified descendant of a parent originally created, in the usual sense of the term) they may 
be taken as affording proof of the variability of the species in several divergent directions, 
tending towards resemblance to Ithomue. 
Fig. 6 a. Ithomia Illinissa (Hewits.). — Ega. 
Fig. 10. Dioptis JEliana (n. sp. or var. ?), deceptively like, when flying, Ithomia Mlia, a small species 
near akin to J. Illinissa, and found in company with it at Ega. 
Fig. 11. Dioptis Ilerdina (n. sp. or var.?). Closely resembles, when flying, Ithomia Ilerdina (PI. LVI. 
fig. 4 a), and found in company with it at St. Paulo. 
Fig. 12. Dioptis Onega (n. sp. or var.?). Closely resembles, when flying, Ithomia Onega (PI. LV. 
fig. 2 a), and flies in company with it at St. Paulo. 
Fig. 13. Dioptis Cyma (Doubleday). Closely resembles Ithomia Cymo, a species similar to /. Flora 
(fi 
6 
Plate LVI. 
Leptalis Theono'e, var. Eryth 
W. long 
Fig. 2. Leptalis Theono'e, var. Ery throe.— St. Paulo. 
Fig. 3. Leptalis Theono'e, var. Erythroe.— -St. Paulo. 
Fig. 3 a. Ithomia Orolina, var. Chrysodonia.— St. Paulo. 
variations between L. Erythroe' and Theonoe can be traced through the varieties 
mgs 
narrowing 
8, 5, and 6 of the preceding Plate. The sul 
to be a simple variation. Some traces of the 
also seen. The imitation of Ithomia is not n< m 
the preceding and fig. 4 of the present Plate, but there is a considerable approximation, giving 
as it is m 
appearance of a striving after 
The selection of individuals having the 
most faithful likeness is here either not rigid or we see the formation of an exact mimetic 
analogue in process. 
var 
St. Paulo. 
Fig. 4a. Ithomia Ilerdina (Hewitson).— St. Paulo. 
This Leptalis appears at first sight an absolutely distinct species, but it is plainly a modifies 
