Genus Colsenis 
protected species, which abound in the regions in which the genus 
attains its greatest development. The median vein in the upper 
wing is characterized by the presence at the base of a minute, 
thorn-like, external projection; the second subcostal nervule is 
emitted beyond the cell; the cell of the hind 
wing is open. 
The life-history of the two species found 
within our fauna has not as yet been carefully 
worked out, and aside from a knowledge of 
the fact that the caterpillars closely resemble 
in many respects the caterpillars of the two 
succeeding genera, being provided with branch¬ 
ing spines on their bodies, we do not know as 
yet enough to give any complete account of 
the early stages of these insects. 
(1) Colsenis Julia, Fabricius, Plate VIII, 
Fig. 6, $ (Julia). 
The upper side is dark reddish-orange, the 
borders are black, a black band extends from 
the costa at the end of the cell to the outer margin on the line of 
the third median nervule; the costal area on the hind wings is 
silver-gray; the wings on the under side are pale rusty-red, mot¬ 
tled with a few darker spots, principally on the costa, at the 
end of the cell, and at the apex of the primaries. There are a few 
crimson marks at the base of the hind wings, and two light-colored 
lunules near the inner angle of the hind wings. Expanse of wing, 
3.50 inches. 
This butterfly, which mimics the genus Heliconius in the out¬ 
line of the wings, is very common in the tropics of America, and 
only appears as an occasional visitant in southern Texas. 
(2) Colsenis delila, Fabricius, Plate VIII, Fig. 4, $ (Delila). 
The Delila Butterfly very closely resembles Julia, and princi¬ 
pally differs in being paler in color and without the black band 
extending from the costa to the outer margin of the primaries. 
This species has nearly the same form and the same size as the 
preceding, and, like it, is occasionally found in southern Texas. 
It is very common in Central America and the West Indies. One 
of the earliest memories of my childhood relates to a collection of 
Jamaican butterflies in which were a number of specimens of this 
butterfly, which I have always much admired. 
95 
tion of the genus Co- 
Icenis , slightly less 
than natural size. 
