228 
MEMOIES OF THE i^ATIOiN'AL ACADEMT OF SCIENCES. 
H. manteo var. — birch, Virginia, September 14, 1882,” Department of Agriculture.) 
Two blown specimens, full-grown larvie. (PL XXIX, ligs. o, ou.) Length, 30 inm. The head is 
moderate in size, shaped as in that of normal manteo^ with a lateral, narrow, brown line, bordered 
externally with white. The head is rather freer from bristles, and is paler than in normal manteo; 
ill fact the whole body is i)aler, like the underside of a birch leaf, compared with the other blown 
specimens. In one of the examples there is a fine, narrow, reddish V-shaped mark, the arms of 
the V being situated outside of the clypeus. 
On the ])rothoraeic segment are two flattened, yellowish, piliferous warts, connected by a 
slight low ridge. There are four dorsal smaller conical piliferous warts on the second and third 
thoracic segments. (These are just as in II. manteo.) On the first abdominal segment are two 
cylindrical, conical, coral-red dorsal tubercles, arising from smaller bases, and are (in one example) 
deep blood-red, forming an oval spot, situated mostly on the outside of the tubercles. These tuber- 
cles are of the size of those in Stage lY of normal manteo^ and the conical nipples are themselves 
larger than in some of the fourth stage of normal manteo^ but of the same size as in the others ; in fact, 
these tubercles vary much in size in different individuals of normal manteo of Stage lY, which shows 
that they are comxiaratively suddenly xiroduced or are a lately acquired character, and are thus 
inconstant. The third abdominal segment is lunch as in normal manteo., Stage I Y, but in one of the 
^])ecimens is a large, deep blood-red, iiregular, oval, subdorsal sjiot of the length of the segment 
itself, and iii the subdorsal line on the sixth abdominal segment is a much smaller blood-red spot. 
The eighth segment is dorsally decidedly gibbous, and bears two distinct, but small, yellow, 
piliferous, tlattened dorsal warts. The dorsal j'cllowish and the two subcloi’sal yellowish white lines 
are of the same width and arrangement as in normal manteo., but tho red inner border is nearly 
obsolete. 
What at once strikes the eye are the three pairs of unequal, deep blood-red, subdorsal spots, 
which are partly inclosed by the subdorsal lines. On the sides of the body are thickly scattered 
red siiots, running sometimes into very short curved lines. 
There is a sxiiracular yellow lino extending from next to the head to the second abdominal 
segment, beyond which it is obsolete. The abdominal feet are tipped with reddish; the anal legs 
with two parallel reddish stripes beneath, while the lateral piliferous warts are yellow. 
It varies much in the three pairs of snbdorsal, abdominal, dark blood-red s^iots, as they are 
^entirely wanting in one of the specimens. It is plainly derived from normal manteo., and is adapted 
for existence on the xiale yellowish green underside ofthe birch leaf, while the deep blood-red s])ots 
are similar in color to those of the birch tAvigs or leafstalks. 
A larva near L. manteo^ if not of that species . — Three blown siiecimens, ^‘No. 3o0, on linden, 
October 17, 1874:,^’ were loaned me by Professor Eiley. (PL XXIX, figs. 4, 4a.) 
I can not see any difference between these specimens and JI. manteo. Length, 34 mm. The 
head is deep amber, with a broad, black, lateral band bordered extei’ually with a rather narrow 
whitish baud. The dorsal tubercles are as iu H. manteo of the last stage. Those ou the first 
abdominal segment are small, low, tlattened and red around the base. The eighth segment is 
gibbous, with the pilifei'ous warts small, normal, and yellow. The yellow dorsal line is distinct, 
and the subdorsal lines are, as iu R. manteo^ broad and white, tinged with yellowish on the upper 
edge, and broadly but veiy irregularly bordered with reddish inside, this edging broken up into 
red scattered spots. The spiraciilar line is yellow, situated just below tho spiracles, which, as 
usual iu this genus, are partly merged in the ujiper edge of the line. 
Cocoon . — In coiifiuemeut spinning “a very slight, elastic, silken cocoon,” some “a tough silken 
cocoon, others one made only of a few threads, while Gomo had no cocoon at all, but had made a 
smooth cavity iu the earth” (Eiley). According to Comstock’s informant, in nature the mature 
caterpillar entered the ground, where they laid most of the winter before transforming. 
Pupa . — $ (head wanting). Length, 18 mm. End of body less blunt than iu Bchizura. 
Last four segments smooth, polished; cremaster ending in two stout foot-like spines, the toe very 
long and iiointed, the heel pronounced; the surface transversely densely corrugated; vestiges of 
anal legs swollen and quite distinct; two 5 sexual opeuiugs, the hinder one being the smaller of 
the two. (Drawn ux) from Eiley’s No. 249.) 
