from Maranham. 537 
maintain their close resemblance to them. I have stated in 
my paper, that in localities where Ithomia Flora was not 
present, but was represented by one or more allied species 
of very different colours, the Leptalis of the locality had 
assumed the same colours to suit these changed species. 
Montes Aureos lies within the area of the typical Ithomia 
Flora, and it is therefore the Theonoé form of the Leptalis, 
or that which most closely resembles J. Flora, which is 
here found. But an interesting variety of Leptalis 
Theonoé occurred in the same locality, differing from the 
type in having a reddish stripe within the black margin 
of the hind wing; this resembles closely a common 
variety of the [thomia mhabiting this and other districts. 
In fact, [thomia Flora is generally found to occur under 
two forms or varieties, and both of them are imitated 
by corresponding varieties of the Leptalis. 
Hleliconius Erato and Doris. 
These two forms are still kept separate in some collec- 
tions, on account of their striking difference in colours, 
the one red and the other blue. I bred, however, on one 
occasion, a large number of both from one set of cater- 
pillars, found feeding socially on leaves of the same branch 
of a tree, and, apparently, belonging to one and the same 
brood. Mr. Salvin also captured the two forms in copuld. 
The difference in colour occurs in both sexes, and, in 
most localities on the Amazons, there is no trace of con- 
necting links of variation. It is a case, in fact, of dimor- 
phism, and interesting on account of its persisting 
throughout two distinct local races of the species, one 
found in New Granada and the Isthmus of Panama, and 
the other in Guatemala. The difference between the two 
forms is not simply asubstitution ofone colour for another, 
for there is a marked difference also in pattern, and in the 
glossiness of the surface ; the differences, however, relate 
only to the upper surface of the wings. The fine series 
of specimens brought home by Mr. Belt show that 
this Heliconius has almost lost its dimorphism in the 
Montes Aureos district, as he found nearly all pas- 
sages in coloration and pattern between one form and 
the other. In the neighbourhood of Para examples 
eccur of Hrato (the red form) with the red colour at 
the base of the anterior wing nearly obsolete, and traces 
of glossy blue on the borders of the nervures of the pos- 
