1890 .] 
549 
[Packard. 
Fifth and last stage . — Length 30-32 mm. It differs in the dor- 
sal piliferous warts on the first thoracic and first and eighth ab- 
dominal segments being smaller than in the fourth stage, being 
now no larger than those on the other segments, and the hump on 
the eighth segment has almost disappeared. There is, as in the 
fourth stage, a conspicuous red dash on each side of the third ab- 
dominal segment, and the other lines are as described in the fourth 
stage. 
RECAPITULATION. 
1. Head large, with dark spots and connected lines in stages I 
and II. 
2. The spots disappear, and the peculiar lateral dark line edged 
with white, characteristic of the final stage, appears in stage III. 
3. The piliferous tubercles on first thoracic, and first and eighth 
abdominal segments attain their maximum in stage II ; the ten- 
dencj 7 after this stage is to return to a simple, smooth body, with- 
out excessive ornamentation, or any decided change in coloration. 
4. In stage III, all the other tubercles diminish in size. 
5. The style of coloration of stage V is indicated in stage II. 
6. In stage IV, the tubercles almost reach their minimum, be- 
coming still smaller in the final stage. 
7. The few tenant hairs present in the first stage are battledoor- 
shaped. 
It is interesting to notice, in reviewing the life-history of this 
species, the strong tendency shown after the second stage to a dim- 
inution in size of the tubercles, so that by the fourth stage the 
body becomes smooth and free from all projections, humps and 
spines, and thus more noctuiform. At the same time the yellow 
and whitish stripes and pink blotches become indicated at an ear- 
lier stage than usual, as if the aim were to adapt the caterpillar 
to the ribs and parallel greenish and yellowish lines or shades of 
the leaf on which it feeds. 
THE MATURE LARVA OF HETEROCAMPA PULVEREA Gr. & R. 
From the examination of blown larvae in Professor Riley’s col- 
lection, I am enabled to make the following observations : it is 
congeneric with that of H. subalbicans. The anal legs of H. pul- 
verea are like those of H. subalbicans, but the larva differs in being- 
smoother, i. e., having smaller dorsal tubercles. The head is pro- 
duced towards the vertex and is narrower than in H. subalbicans. 
