Forbes (1939): ‘In the Euchromiinae M2 of
the hind wing is rudimentary or absent, being represented
by a faint vein or line of scales from the angle of the disco-
cellular, and Cu1 and Cu2 are stalked or united; while in
the Ctenuchinae M2 is fully developed and curved, arising
from below the angle of the discocellulars, and Cu1 and
Cu2 are widely separated except in the Horama group. A
few aberrant genera also have M2 obsolescent from the
angle but Cu2 well separated.’ 

Fleming (1957): ‘The absence of vein
Sc in the hindwing separates the Euchromiinae from other
families of Trinidad moths. In this subfamily vein M2 of the
hindwing is rudimentary or absent but often represented by
a vein·like line of scales. Whereas in the subsequent subfam-
ily, Ctenuchinae, vein M2 of the hindwing is present. Veins
CUl and CU2 are stalked or united in the Euchromiinae, but
in the Ctenuchinae. with the exception of the Horama and
related genera, they are widely separated.’