Packard.] 
538 
[Feb. 19, 
resinous red. The anal and other abdominal legs are tinted with 
reddish. There is a lateral reddish line along the sides of the tho- 
racic segments ; a double dorsal reddish line on the seven terminal 
abdominal segments extending out on the uplifted anal legs (not 
developed in stage II, though faintly indicated). Those observed 
August 4th, later on in this stage, had changed a little since moult- 
ing, have assumed more of the distinctive coloring of the fully fed 
larva ; the yellowish-green parts, especially on the thoracic segments, 
are now of a bright pea-green, while the silvery-white V-shaped 
mark on the sixth to eighth abdominal segments, so characteristic 
of the genus Schizura, is now very distinct. (This mark is faintly 
indicated in the previous stage, by two broad slightly converging 
whitish-yellow dashes on the seventh segment, and a median point- 
ed whitish dash in front, but in the present stage these dashes are 
strengthened, united, broader, and colored more distinctly.) 
A noteworthy step taken at this stage is the final consolidation 
of the two dorsal tubercles of the first abdominal segment, which 
now becomes a forked single tubercle. 
Fourth stage , after the third moult. — Observed Aug. 6. Length 
15-16 mm. The characters of the full-fed larva are now almost 
wholly assumed. The head is high and narrow, the vertex bearing 
two tubercles. The forked tubercle on the first abdominal segment 
is now larger and higher than that on the eighth segment ; all are 
reddish, tipped with black. The body is much thicker than before 
and marbled, except on the pale pea-green meso- and metatho- 
racic portions, with reddish lines and spots, which are much more 
numerous than before. The hairs are now entirely changed in 
shape, being simple and pointed like those on the head. 
Fifth stage , after the fourth moult. — Observed Aug. 16-18. Length 
25-27 mm. and finally 35 mm. This stage does not differ essen- 
tially from the fourth, except that the horns are a little higher. 
The markings and colors of the mature larva seem to be acquired 
in this stage. 
Sixth and last stage , after the fifth moult. — Length 35 mm. The 
essential or specific characters may be best brought out by com- 
parison with the fully-grown larva of S. unicornis. S. ipomece is 
larger and the hairs are longer. The head is less angular above 
and not so strongly marbled with the irregular network of reddish 
lines and has four dark lines in two pairs extending from the ver- 
tex to the base of the mandibles. The arrangement of the four 
