_ HELICONIUS.—EUEIDES., 161 
wanting. This race Boisduval described as H. thetis®, but, in our opinion, on an 
insufficient and unstable character. 
In Guatemala we found H. erato most abundant in the virgin forests of Northern 
Vera Paz, where the red- and the blue-winged forms were commonest, and flew quite 
indiscriminately in the forest paths. Respecting the distribution of the differently 
coloured members of this species, Mr. Bates’s observations are of great interest ; for after 
enumerating various localities where the blue- and the red-winged forms fly together, 
he goes on to say that at St. Paulo, on the Upper Amazons, the blue-winged form alone 
was found in profusion, to the exclusion of the other 2. 
H. erato has only one near ally in H. metharme, which is a not uncommon insect at 
Ega and St. Paulo ; but from this it differs in many points ?. 
EUEIDES. 
Eueides, Hiibner, Verz. bek. Schmett. p. 11 (1816) ; Doubleday, Gen. Diurn. Lep. p. 145. 
This genus was placed by Doubleday as the head of his family Nymphalide; but in 
his description of its characters he alludes to the many points of resemblance it bears to 
Heliconius, the chief difference being the clavate antenne. 
Mr. Bates subsequently * associated Hueides with Heliconius in his Acreeoid Helico- 
nid, removing it altogether from the Nymphaline. ‘This association seems to have 
since been pretty generally adopted, and Eueides placed next to Heliconius in the sub- 
family Heliconine. 
Whether we look at the structure of the front pair of legs, the neuration of the 
secondaries, the general shape of the wings, or to the secondary sexual characters of the 
male, the resemblance of Kueides to Heliconius is evident. 
Regarding the secondary sexual male organs the same complicated character observ- 
able in Heliconius can be traced, and the main outlines of the various parts seem to be 
very similar; but the difficulty in interpreting their meaning from an examination of 
specimens that have been dried is great and the result not always satisfactory. The 
tegumen has a similar stirrup-like piece inside its cavity as in Heliconius ; the harpagones 
are of similar form, having what appears to be a membranous envelope; the penis, too, 
is very short. 
The obvious point of distinction between the two genera rests almost entirely with 
the antenne, which in Eweides are distinctly clubbed, and in Heliconius gradually 
thickened towards the distal end. 
Some twenty-four species of this genus are now known. These are spread over 
nearly the whole of Tropical America, some being also found in the larger Antilles, such 
as Cuba and St. Domingo. In Mexico and Central America we now know of seven 
species, five of which are peculiar to the region. Two of these are found in Mexico (none 
* Trans. Linn. Soc. xxiii. p. 496. 
BIOL. CENTR.-AMER., Rhopal., Vol. I., December 1881. Y 
