1890 .] 
527 
[Packard. 
abdominal segment. The large hump on this last named segment 
is large and high, but scarcely differs in tint from the rest of the 
body, though slightly darker. On each side of the ninth segment is 
a large black comma-shaped spot, the point directed forward and 
downward, while behind them is a median black dot. There is a 
broad yellowish spiracular lateral band ; above it a pale dirty white 
band, edged above by the lateral, or rather subdorsal black line ; the 
under side of the body, including both the thoracic and abdominal 
legs is whitish. The anal legs bear about six hooks. 
Second stage , after the first moult. — Length 6-8 mm. Aug. 27. 
The head is still very large in proportion to the body. The hump 
on the eighth abdominal segment is larger, more pronounced and 
orange-yellow, sometimes red ; the head is dull amber. The dorsal 
line is now distinct, and the subdorsal line is triplicated on the 
two anterior thoracic segments and duplicated on the eighth ab- 
dominal. Behind the dorsal hump there are two instead of one 
median black dots, one placed behind the other, and two black spots 
are added on the side of the body near the base of the anal legs, i.e., 
two on the ninth and two on the tenth segments. On the pro- and 
mesothoracic segments are two parallel short, sinuous blackish-red 
lines. The spiracular band and under side of the body as in the 
previous stage, but deeper straw-yellow. The anal legs have a lon- 
gitudinal reddish stripe on the outside or are reddish near the tip. 
The hairs are longer and slenderer than before, taper a little, but 
are docked at the tip, and arise from warts, those on the back ar- 
ranged in a trapezoid. 
Third stage % after the second moult. — Length 20 mm., Sept. 6. 
The general shape of the body of the mature larva, with its large 
smooth dorsal hump and peculiar shining banded skin are now as- 
sumed ; the specific characters having apparently now appeared, 
though we have none of the other species ( alhicosta and packardii ) 
with which to compare it. The head is still large, wider than the 
body, which does not yet grow smaller towards the head as it does 
in the fully grown larva. The body is now richly and very conspicu- 
ously banded so that already in this stage the caterpillar becomes 
a very showy object. How it is regarded by birds and ichneu- 
mons remains to be observed. The narrow thread-like dorsal line 
and the lateral line are now enclosed in a broad dull whitish gray 
band bordered on each side by a faint dark line. There is a sub- 
dorsal straw-yellow broad band. The spiracular deep straw-yellow 
band is bordered below by a double blackish-red broken line. The 
