892 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
by a few, short, stout, black spines. The second is more rounded at tin- top, shining 
black at tin- base, and resembling white glazed porcelain at the apex, with four 
black spines. The next two are smaller, about 2V"" 1 apart on the front edge of the 
segment, the lower of which is abont 5""" from No. 2. These are very small and 
black, the nppei one haying a trace of greenish white at the apex, rod both are sur- 
mounted with several short black spines. The lowest tubercles on segments 'A tod, 
inclusive, arc small, with black bases, apices resembling white glazed porcelain, and 
generally two black spines. The tubercles of the next row above, extending from 
the third to the last segments, inclusive, are very similar in form and color, but 
Larger ; those of the row above this are slightly pear-shaped, a very little thickened 
towards the outer end, of the same color as the preceding, and surmounted with from 
(bur to six short stout black spines. Those of the next row on the third, fourth, and 
tilth segments, and the corresponding ones on tin- opposite side of the dorsum — by far 
the Largest on the larva— are pear-shaped, largest outwardly, porcelain-white at the 
■ ith a band of shining black above, and a bright coral-red top, with from 
six to eight stout black spines. The tubercles of this row on the sixth to the 
eleventh segments, inclusive, are nearly as tall, but slimmer than those preceding, 
.slightly curving backward, porcelain white at the base, a very light straw color 
above and armed with two black spines at the top. The dorsal tubercle of the 
twelfth segment is very similar, but larger, and armed with several black spines. 
The tubercle at the base of the anal proleg is smaller than those, before it, of a light 
bluish color, with black at the base outside. 
The most striking differences observed between P. Columbia and P. cecropia in a 
brood of the latter raised by the side of the former are, tirst, the smaller size of 
Columbia at each of the stages; the mature larva of Columbia is about finches in 
length, that of cecropia about 4. Secondly, Columbia is of a clear light pea-green 
color, cecropia a dull bluish green, giving a much darker aspect to this larva. This 
distinction of color is so marked that, if once observed, the one cau never be mis- 
taken for the other. Thirdly, Columbia has three pairs of coral-red tubercles, one 
pair each on the third, fourth, and fifth segments ; cecropia has two pairs, one pair 
each on the third and fourth segments. Then the color of these differ; those of 
Columbia are a true coral or vermilion-red, while all the cecropias I have seen have 
these tubercles a color somewhat approximating that of resin. Theremaiuing dorsal 
pairs of tubercles to the twelfth segment and the central one on the twelfth are lemon- 
yellow, while in Columbia they are white at base and a very light straw color above. 
The remaining tubercles of cecropia are black at the base, but with the look of white 
glazed porcelain above. The distinctive characters show no tendency to run into 
each other in any of the examples I have seen. As perhaps having a bearing upon 
the question whether Columbia is a hybrid between cecropia and promethea, I will say 
that in six years of careful collecting at this place I have never taken a promethea, 
nor has one ever been taken here to my knowledge, yet the empty cocoons of Colum- 
bia have occasionally been found, mostly in larch trees, in one instance about 40 feet 
from the ground. I am therefore conviuced that Columbia is a good species, but 
whether distinct from gloveri I am not prepared to express an opinion. 
4. The red tussock-moth. 
Orgyia antiqua (Liun). 
This tussock caterpillar occurred frequently on the larch at Bruns- 
wick, in the early part to the middle of September. 
5. The white spotted tussock-moth. 
Orgyia leucostigma (Abb. & Smith). 
We have found the caterpillar of this moth late in August in Maine 
spinning its cocoon and preparing to transform into the chrysalis state. 
