OF THE AMAZON VALLEY 
497 
This view of the affinities of the family will make a great difference in the concept 
of the gronp as regards the affiliation of the forms 
Instead of heing a group isolated 
its structure, and peculiar to the tropical parts of America, it results that the bulk of the 
genera have a very close relationship to the Dcmaidce, which are found in all hot countries 
of both hemisph 
the Acrceoid Heliconid<e alone are an isolated set of forms 
The 
American productions, however, show a great superiority in structure and in the diversit 
of the forms over those Qf the Old World 
Danais 
In Africa only one genus occurs, namelv 
In the tropical parts of Asia four genera are found, besides Dona is ; these 
Ideopsis, Hestia, Euplcea, and Hamadryas, which contain together 74 species. In the 
hot parts of America 16 genera (of Danaoid Heliconidce) have been discovered, comprising 
233 described species. Besides this greater diversity of generic and specific forms, the 
American productions show a much greater advance in organization than those of the 
Old World ; in other words, they recede further from what may be considered as the 
common type, namely, D 
This is clear from the great and progressive modificat 
the position of the radial nervures and discocellulars of the hind wings, and the 
In all 
advanced stage of atrophy of the male fore legs readied by most of the genera. 
the Asiatic genera the fore legs are in the same condition as in Danais and the Ny 
phalida?. The following Table will show the relative value of the productions of the fr 
hemispl 
clearer manner. I have placed the genera in accordance with what 
seem to be their mutual affinities 
The relative length of the lines between them 
gh expression of the degree of relationship. The collateral lines of 
also attempted to be expressed 
Asia. 
Danais (31 sp.) 
Danaid^. 
Africa. 
Danais (10 sp.) 
America . 
Danais (8 sp.) 
Ideopsis (2 sp.) 
Hestia (12 sp.) 
Euplcea(58sp.) 
Dan|aotd Helicomd-e. 
Lycorea (6 sp.) 
Ituna (3 sp.) 
Hamadryas (2 sp.) 
<J 
Thyridia (3 sp.) 
Dircenna (8 sp.) 
Callithomia (3 sp.) 
Methona (3 sp.) 
Eu tresis (1 sp.) 
Olvras (1 sp.) 
I 
Melinsea ( 1 3 sp . ) 
I 
Tithorea (7sp.) 
cf 
Napeogenes (17 
Ceratinia (23 sp.) 
) Ithomia (107 sp.) 
Hymenitis (10 sp.) 
anitis ( 1 7 sp.) (including Athesis) 
Sais (1 sp,) 
has ventured to withdraw the whole of the genera composing the g 
Heh 
Heliconidce to the two eenera Heh 
an 
Heli 
nervule at the base of the fore-wing median nervure 
3x2 
