352 MODERN CLASSIFICATION OF INSECTS. 

discoidal cell of the hind wings is always closed (fig. 97. 9. hind wing 
of Heliconia diaphana) ; the antenne are slightly clavate (fig. 97.10. tip 
of antennze of Heliconia) ; the palpi are short, and wide apart at the 
base (fig. 97. 7. head of Heliconia diaphana); the second joint being 
generally clothed with hairs directed upwards at its extremity (jig. 
97. 8.); the wings vary in shape, but are often very long and narrow. 
The caterpillars are cylindrical and either spinose (fig. 97. 12. larva of 
Acrea Viol), or furnished with several pairs of long fleshy append- 
ages ; that of H. Euterpe is robust and depressed, with a series of 
long fleshy lobes ; that of H. Calliope short and cylindrical, clothed 
with slender spines and tufts of hair. Those of H. Psidii are smooth, 
and that of H. Ricini is covered with very long white hairs. That of 
D. Plexippus Linn., Cramer, Say, and Peale (Lep. Americana, pl. 7. 
Archippus Smith and Abbot) is pale, with zebra-like marks, and two 
long retractile horns arising from the second and last segments of the 
body (jig. 97.1.). The chrysalides, moreover, are only suspended 
by the tail; they are often ornamented with brilliant golden spots 
(fig. 97. 2. pupa of Danais Plexippus Linn. ; 97. 13. pupa of Acrea 
Viole.) 
These insects are much more varied in their colours than the 
Pierides, but cannot vie in splendour with the Nymphalide. They 
are entirely exotic, of a moderately large size. In many of the species 
the wings are but slightly covered with scales, and even in a very 
few species they are quite denuded (H. diaphana). 
M. Lacordaire’s observations upon such of these butterflies as 
inhabit French Guiana (Ann. Soc. Ent. de France, 1833) are very 
interesting. A curious circumstance has been recently published 
relative to one of the species Euploea (Danais) hamata MacLeay, an 
