oat) THE CANADIAN ENTOMOLOGIST. 
LIMENITIS URSULA. Changed to astyanax by Butler, 1869, and 
followed by Kirby and Scudder. Fabricius’ Syst. Ent., 1775, named the 
species astyanax. In Ent. Syst., 1793, he re-named it wrsula for the 
following reason: It then stood,in the genus Papz/io, in which also stood 
another aséyanax. He therefore changed the name of the first to ursu/a, 
and by this latter the species has come down to this day. It is so figured 
by Abbott & Smith, and by Boisduval & Leconte. That Fabricius was 
right in so changing the name to avoid a duplicate in the same genus, is 
undoubted, and although the species which still retains the name astyanax 
has since been found to be the female of something else, and hence loses its 
original name, there seems no good reason for disturbing wrsuda.  Fabrr 
clus was right in making the change, and once right always right in such 
a matter. Of course I do not allow or believe that proserpina is a variety 
of wrsula; it is as near arthemis as ursula in some respects. 
ON THE LARVA OF PLUSIA BALLUCA. 
BY W. SAUNDERS, LONDON, ONT. 
In the second volume (1863,) of the Proceedings of the Entomological 
Society of Philadelphia, I published a paper on some of our Lepidopterous 
larvæ, and among other descriptions there appeared one purporting to be 
that of Plusia balluca. By some unfortunate mishap a description of 
the larva of V. ixterrogationis was sent in place of the intended one of 
balluca, and the mistake was not discovered until after the number had 
been issued, while all trace of the original description of the larva of 
balluca was lost. I did not again meet with this larva until the summer 
of 1871, when a fresh description was taken on the 15th of June, as 
follows :— 
Length, 1.20 in. ; body thickest on middle and posterior segments, taper- 
ing towards the front ; the body is arched or looped along the middle seg- 
ments when in motion. 
Head rather small, bilobed, of a shining green color, with a few whitish 
hairs. 
