MEMOIRS OF THE I^^ATIOI^AL ACADEMY OF SCIEXCES. 
109 
Fig. 54.— Pupa of Datana from 
Olympia, ‘Wash. Doraal view of 
lioad. 
several of the same species or variety from Judge P. C. Truman, of Volga, S. Dak., v^liich dilfers 
from the same form only in slight respects (i. e., the yellow spot below the vsuranal plate), and 
which also lives on the oak. I will first describe the Oregon specimens from life. 
Larva. — Length, 35 mm. Head black, rough, punctured, coarsely so below the vertex; the 
punctures more or less confluent on the sides and in front, with fine lines and ridges. Shape of 
the body as in D. ministrn; prothoracic shield entirely ocher-yellow (not lemon or sulphur yellow), 
the yellow extending flown each side of the plate and, as in /A minisiraj 
crossed longitudinally by a black hue, below which is an ocherous 
yellow line. Body on each side with five narrow, somewhat wavy, 
lemon or greenish yellow lines; the fourth or lateral line wavy or 
scalloped and interrupted at the sutures; the fifth line broken and 
represented by short portions between the thoracic and the abdominal 
legs. All the lines are narrower than in _Z>. ministra. Thoracic legs 
entirely black ocherous around the base, but not so much so as in 1). 
ministra. Middle abdominal legs ocherous, with an external dusky 
brown, not black, not very large patch Just above the planta. Two 
ocherous patches behind the thoracic, and behind the fourth pair of abdominal legs in the place 
where the abdominal legs would be if present; these patches as in iA mmis/rn, but snialler. Of 
the four unbroken lines the three subdorsal ones are continuous; the uppermost or dorsal one is 
slightly narrower than the third one from the tox^ or middle of the back. The ventral median 
line is broad and continuous, also lemon-yellow, like those above. End of the body black, the 
yellow lines scarcely reaching the tenth segment, and not coalescing under or below the suranal 
plate, as they do in I>. mmistra. In this respect the larva is more as in 1). angnsii, though in the 
iSouth Dakota specimens two of the lines do coalesce and form a small yellowish x>utch. The 
body is hairy, much as in 1). ministra in color, being imle gray or testaceous, i, e., x>ale tawny and 
m>t white, as in I>. angiisii. The hairs are long and abundant, those of the thoracic and three 
last abdominal segments longer than the others; the short dorsal ones form tufts, nearly meeting 
over the middle of the back, and the lateral iiairs are grouped in tufts directed downward. 
1 at first referred the larva to I), angnsli on account of the narrow lemon-yellow lines, but it 
differs from that species in having ond more lateral line, the ventro lateral one (though in a 
blown sxiecimen of J>. angnsli given me by the late Mr. Elliot, this line is rex>resen ted by a faint 
yellow mark on each segment); it also differs in the i)rothora<dc xilate being always ocher-yellow; 
also the thoracic segments between the legs are not “inirxdish black,” but ocherous yellow. 
It differs from i>. ministra., to which it is nearest allied 
(and in this resx>ect I agree with Dr. Dyar, to whom I sent 
specimens) in the narrow lemon rather than suli>hur yellow 
lines, in those lines not being coiiflueut on each side below 
the suranal i)late (though in the South Dakota specimens 
slightly so), and in the ventro-Iateral or fifth line not being 
so distinct. The body beneath with ocherous |)atches, but 
smaller, less extensive than in /A ministra., the latter, how- 
ever, differing in this resx)ect in different sets of specimens. 
This may ju'ove to be a climatic variety of I), ministra; 
I should certainly think so if its food i>lant in South Dakota 
and in Oregon were the ai^ple, as we should hardly expect 
to find an}'' sx^ecies of the genus on the Pacific Coast, though 
I), californica may be authoctonous. The South Dakota 
s])ecimens are in one resx)ect, i. e., the small yellow bauds on the sides of the tenth segment, 
intermediate between D. ministra and the Oregon examples. 
The following is a description from life of the South Dakota specimens: 
JAirva . — Length, 17 mm. Head large, black; prothoracic shield ocherous yellow. Body 
black, with five narrow lemon or greenish yellow strix>es on each side, all of nearly uniform 
width; the longest (fifth) are broken and not readily seen; end of the lines confluent on the 
tenth abdominal segment, forming a small ocherous spot below the suranal plate. A median 
Fig. 55. --Pupa of Datana from Olynipia, Wash. 
