Packard.] 
550 
[Feb. 19, 
There is a black line, with a wider purple band beyond, a yellow 
dorsal line and two lateral ones, the lines edged with purple dots, 
with which the body is elsewhere scattered (these lines are con- 
fused and diffuse in the largest, mature specimens). Along the 
back is a pair of deep red lines (sometimes nearly obsolete) much 
as in H. subalbicans , converging on the prothoracic segment, par- 
allel and very near each other on the mesothoracic, thence very 
widely diverging on the second abdominal and approximating 
on the suture between the fourth and fifth abdominal segments. 
Length 35 mm. Before the final moult the front edge in the middle 
of the prothoracic segment is turned up and stained with yellow, 
with two red dots, the remains of the red line. 
LIFE-HISTORY OF HETEROCAMPA UNICOLOR PACK. 
Thanks to Professor Popenoe, 1 we now have an account of the 
transformations of this species, whose eggs are, as usual in this 
group, hemispherical and “ laid in close groups of from fifteen to 
seventy-five, upon the under side of the leaf of the sycamore.” It 
appears that the “newly hatched larvae for a time feed in company 
upon the leaf-pulp,” and in the first stage when disturbed fall or 
spring off and hang suspended by a silken thread. It is to be no- 
ticed that the larva “forms a loosely woven silken cocoon under or 
among the leaves and other rubbish upon the ground.” There ap- 
pears in the pupa to be no well-developed cremaster with curved 
setae. 
While the different stages are not specially described, only stages 
I, II and V being figured and briefly noticed, the following facts 
are apparent : 
First stage . — Length 5 mm. Anal legs much longer than in the 
last stage, being as long as abdominal segments 7-10, or one- 
fourth as long as the body. From the prothoracic segment arise 
two very long, blunt tubercles, nearly as long as the body is thick. 
Second stage . — Length 9 mm. The anal legs are still longer 
than before, but the prothoracic spines are much less than one- 
half shorter than before, while the back of the body is now red- 
dish. 
Last stage . — In a blown full-grown larva received from Professor 
Riley, the body is cylindrical, smooth, and the head is small and 
1 First Annual Report of the Kansas Experiment Station, for 1888, Kept. Dept. Hort. 
and Ent., p. 35. The illustrations were drawn by Mr. C. L. Marlatt. 
