MEMOIES or TUE KATIOXAL ACA1)E:\[Y OF SOIEls^CES. 
213 
Moth . — Three <5 , five $ . Head ash, tawny ashen, Avith reddish brown discolorations, thoras 
ash color with reddish brown scales behind. Fore wings very pale tawny in the middle of the 
wing-, between the cinereous costa and the brown inner margin, transverse lines. At the 
base along the cubital A'ein is a dark streak ; there are three dark si:)ots on the costo-apical region j 
another faint linear ininnte streak in the apical interspace; in the two spaces below are two faint, 
long, linear slight lines between the dark venules. A minute but distinct discal dot succeeded by a 
linear streak reaching to the outer margin, the internal angle are two unequal linear spots. 
A faint row of marginal brown lunnles. Near the internal angle is a brown geminate discoloration. 
Hind wings in ^ white Avith a dusky discoloration on the inner angle. Wings beneath pale; fore 
wings a little dusky externally; the three costo-apical dots and the spotted fringe visible beneath. 
Fringe brown on the v’enules. 
Female: Baseof the fore wings fuscous; beyond ashy; a distinct submedian dark basal streak, 
a minute discal dot, Avith a faint brown streak beyond. Two twin costo-apical streaks, more distinct 
than in the <5 , so also two larger, broader spots near the internal angle. The marginal roAV of 
spots more distinct. Hind wings dark, ashy, reddish brown. 
Expanse of wings, 30 mm., 9 30-31 mm,; length of body, 6 IG mm., 9 17 mm. 
It differs from hadia in the wings being narroAver and longer; the base of the fore Aviugs is less 
reddish, rounder, not lunate. The Muge is whiter on the edge; there is no reddish tinge on the 
hind wings. It is a slender species. After a careful examination I am unable to perceive any 
difference between Avhat I have decided to be nitida and this species. This species, like the rest of 
the genus, is remarkable for the difference in the color of the hind wings in the two sexes. 
A ^ in the United States National IMuseum, labeled *‘240 L, from Goeiir d^Aleue City, 
Idaho, August 20, 1801,” is, though rubbed, evidently paler on the fore wings, with less reddish 
brown than the Eastern individuals. There is no doubt about the si>ecies, as the basal 
longitudinal reddish stripe is i)resent, and it does not differ matei'ially otherwise. It is no larger, 
the alar expanse being 30 mm. 
Yar. salicis Edw. (one S . Type, California. I also have a $ given me some years since hy Mr. 
Edwards). I can not, after repeated examination, really perceive any difference between this and 
the Eastern it only differs in size, being a little larger and with slightly more pointed 
fore wings, as one would expect to find it, in accordance with the facts pointed out in my 
Monograph of Geometrid IMoths (p, 587), where a list of twenty-five species of Geometrids, Avhich 
grow larger on the Pacific than the Atlantic Coast, is given. The three last stages are described 
by Mr. Hyar, and sIioav that the larva is closely similar in each stage to the Eastern conehma. 
Mr. EdAvards’s descrii)tion of the mature larAm agrees exactly with our Rhode Island examples. 
— Diameter about 0 mm. Low hemispherical, the height being about half the diameter. 
The shell is thin, smooth, and under a triplet not seen to be pitted, but under a half-inch objectiA^e 
the surface is seen to be divided into regular, moderately large, flat polygonal areas, with slightly 
raised but distinct edges. No micropyle visible, and no specialized arrangement of the polygons 
on the ai)ex of the egg. 
Freshly hatched larva. — Length, 3 min. Head large, globular, smooth, and unarmed, a third 
wider than the body, deep dark, honey-yellow. The body is greenish yellow above, cherry- 
reddish on the sides; the prothoracic dorsal tubercles are larger and higher than those on the 
second and third thoracic segments and connected by a chitinous band, becoming more distinct in 
Stages II and III. The first and eighth abdominal segments are reddish, including the pair of 
dorsal tubercles, which are of the same size. The end of the body is held up, imicli as in the 
fully grown larva, and I mistook it for a Schizura larva, like the ordinary species, until after it 
had molted, as the tubercles are conical in this stage as in freshly hatched Schizurie of other 
species. In some individuals the greenish dorsal tubercles are dark at the tip. The glandular 
hairs are bulbous at the tips, and a few at each end are nearly one-half as long as the body. 
Three days after, June 27, they became 5 mm. in length, the head noAV small, and the larvm 
were preparing to molt, and July 29-^JO tliree cast their skins. 
Stage II. — Length, 4-5 mni. at first. Now the body is like dark opaque varnish in color. 
The head is dark reddish \mrnish or pitchy in hue, and decidedly narrows above, bearing two 
blunt knobs on the vertex; it is now wider than the body. The prothoracic shield is larger than 
