MEMOIES OF THE ^^^ATIOXAL ACADEMY OF SCIENCES. 
91 
•^extradiscal line not always distinct, forming an oblique Avedge-sliaped costal mark, which is bent 
outward on the subcostal vein and irregularly scalloped between all the venules, the space 
inclosed by these two lines forming a broad obscurely luteous or clay-yellow band which is about 
two or three times as wide on the costal as on the inner edge of the wings. This broad band is, 
especially in the $ , clouded with blackish scales toward the middle and hind edge, or in some 
S S grayish near the costal edge. A submargiual twice-bent line obtusely bent in the second 
median interspace, and again toward the apex of the wings. Fringe concolorous with the wings 
and spotted with dark on the ends of the venules. 
Hind wings slightly paler than the fore wings, usually nearly as dark as the fore wings, 
becoming darker toward and at the outer edge, sometimes with a dark cloud on the inner angle. 
The wings beneath uniformly light ashen, with a distinct black costal vspot on the outer third of 
the fore wings, and on the hind wings just beyond the middle of the costal edge a dark blotch, 
from which in some specimens a broad diffuse line ])asses in toward the middle of the wing. 
Length of body, t5 , 0 to 12 mim; $ , 11 mm.; expanse of wings, 6 , 27-30 mm.; $ , 33 mm. 
The species will be recognized by the uniform cinereous tinge, by the three transv^erse lines 
on the fore wings, by the broad clay -yellowish band, limited within by the slight inwardly curved 
inner or second line and externally by the scalloped extradiscal line, and by the plain outer half 
of the Aving, interrupted near the margin by the rather obscure twice-waved darker line, and by 
the plain hind Avings, 
My original type, formerly in the museum of the Peabody Academy of Science, Salem, is now 
in my own collection. 
Having obtained a colored drawing of Walker’s type in the British Museum (PI. VII, fig. 1), 
there seems no reasonable doubt but that his name has ]>riority. 
E(f<j . — Hemispherical in shape, though unusually low, shell smooth, shining greenish Avhen 
fresh or the embryo is within, as the shell is unusually thin and trausx)arent. Under a Tolies 
triidet the shell is seen to be very minutely intled; under a half inch objective the shell is seen to 
be ornamented with closely crowded, convex swellings or blebs, with a distinct swollen or thickened 
hexagonal edge and a moderately sized central boss or low papilla. The egg is unusually small 
■compared with those of other. Notodontians, esiiecially those of Phoosia (Umidiata^ being only half 
as large. Diameter, 9 mm. They are laid singly on the underside of the leaf of the asi)eii, and 
from their greenish color and small size are difficult to detect. The larva emerges from the egg 
through a beau shax>ed hole on one side of the egg, as in Pheosia. 
L(\rm, ^iage L — Length when first hatched, before feeding, 2.5 to 3 mm.; length when 
described, soon after hutching, 4 inin. Hernl round, smooth, large, or twice wider than the body; 
j)ale whitivSh green, nearly of the color of the body, which is whitish green, with no strixies, sjiots, 
or markings of any kind; the body long and slender, rather fiatteued,' with the sutures deejdy 
impressed, the s'egments being nnusually convex, but entirely smooth, not wrinkled. The 
glandular liairs (PI. Vlll, fig. 5) are very short, minute, moderately thick, and slightly swollen at 
the end, which is divided into three rather slender proce.sses or forks. Body tapering to the end, 
which is not ujilifted; in fact, the attitude of the young larA^a is singular, the body being curved 
laterally so that the head nearly touches the tail. The larva feeds on the underside of the leaf. 
The eggs and young larva were found July 2, on Birch Island, Casco Bay, Maine; some 
freshly hatched larvm also occurred July (>. 
They had already spun on the underside of the leaf a roundish, white mat of silk, on which 
the caterpillar rested preparatory to exuviation. 
When 7 mm. in length just before molting (July 4) the head is still much wider than the 
body, and now there are tw o faint dark dots on the head (on the vertex) and two subdorsal straw- 
yellow lines extending from the front edge of the prothoracic segment to the suranal XAlate. The 
-sutures are also yelloAV. The body tapers from the i)rothoracic segment to the end. 
One n)olted July 5, and is described as follows: 
Larva^ Stacie II , — Length at first, 7 mm; difiers from Stage I in the two conspicuous black 
dividing short bands on the head, ending above the eyes. The two yellow subdorsal lines and 
the transverse linear bars formed by the yellow sutures are as at the end of Stage I, The body 
is still rather fiatteued. The glandular hairs are retained in this stage, and are veiy short and of 
4he same shai)e as in Stage I. 
