200 
MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 
mark iu my male, but a lou^^, slender, two*scallopcd cliscal line, sending four black lines outward 
along the veins. In the 9 a round, distinct discal dot. An outer, obscure, zigzag, double-sordid 
white line, shaded externally with reddish brown, and indicated when obsolete by a double series 
of short, longitudinal, black venular streaks. The venules beyond marked with black scales. 
Fringe whitish, dusky toward the apex, and marked with dusky spots. Wings beneath, whitish, 
dusky on the costal region. 
Hind wings in S white, slightly dusky on the outer edge, and a dusky diffuse patch on the 
internal angle. Abdonien in both sexes olive Avhitish ash, becoming paler toward the end, which, 
in my vSingle male, is not forked as usual in the genus. 
The 9 differs very much from the S ,and is much more common iu collections. The fore wings 
are uniformly of a peculiar stone-ash or leaden gray, tlie basal and outer lines obsolete; a minute 
black discal dot iu*esent. There is, as in the ^ , a broken black line at the base of the wing in the 
submedian space. The outer edge of the wing is clear ash-gray. A series of longitudinal black, 
sometimes red, wedge-shaped streaks just within the clear whiter marginal border^ those op 2 )osite 
the discal dot being the largest. 
Hind wings of 9 uniformly mouse-gray, with no distinct dusky patch near the internal angle. 
Beneath, both wings uniformly dusky, becoming clearer, paler gray on the outer edge. Fore 
wings with four ])ale marks ou the outer third of the costa. 
Ex 2 )ause of wings, ^ 30 mm., 9 30mm.; length of body, S 15mm., 9 15 mm. 
This species differs from 8. ^j^oniew, besides other points noted above, in the longitudinal black 
streaks on the fore wings, in the absence of an inner line, in the linear black discal spot, and iu 
the ireculiar white, frosty gray hue or ground color of the fore wings, there being no reddish or 
brownish shades, excei)t what is faintly shown in the extradiscal line. It differs from 8, nnicornis 
in the longer and more pointed fore wings and iu the absence of reddish brown shades. From 
both it differs in the i)ecaliar black triangular mark on the thoi'ax. The females are at once 
recognized by the peculiar uniform leaden ash-gray ground color of the fore wings. 
— Transverse diaineler, 1 mm., of the same size and shape as those of 8. ipo7ne(v. Hemi- 
spherical, moderately high, and uiuhir a high Tolies lens seen to be very finely ^ntted; under a 
half-inch objective of Tolies the surface is seen to be divided into five and six-sided areas, with a 
distinct raised edge; the surface smooth and more often without the bead so common in eggs of 
8. iponmv. 
Toward and at the microi>yIar region the cells become longer, minuter, and more crowded, and 
in this respect the egg seems to differ from those of 8, ipomew^ in which the areas are more or less 
obsolete in the micropylar region. 
Freshly hatched larm, — Length, 3 min. The head is very large, nearly twice as wide as the 
body; deej) honey-yellow. 
Prothoracic segment of the same tint as the head, but green behind. The rest of the body is 
jiale yellowish green, with rather large honey-yellow warts. The first and eighth abdominal 
segments are deep cherry -red, while the sides of the second to seventh segments above the legs 
ai'e the same color. On the first and eighth segments is a pair of dorsal cherry-red tubercles, those 
on the first somewhat larger than those on the eighth segment; those ou segments 2 to 7 are small, 
of nearly uniform size, and (^oncolorous with the greenish yellow segments. The end of the body, 
including the anal legs and the ninth and tenth segments, is uidield as usual iu the genus. The 
thoracic and first four pairs of abdominal legs are dark. The aual legs smaller than those iu front, 
and are pale, being of the same color as the end of the body. The glandular hairs are distinctly 
seen to be bulbous at the tip and long and unequal iu length, the two longest ones, i. e., those ou 
the prothoracic segment, being about three times as long as the body is thick. 
Comx^ared with the larva of 8, ipomece of the same stage, the two dorsal warts on the 
l^rothoracic segment ajipear to be a little smaller. The glandular hairs seen uuder a half-inch 
objective are of the same length and general shai)e as in 8. iirnnew^ but do not api^ear to be quite 
so bulbous. ' 
^ With the above description may be compared the following one drawn up from Riley’s alcoholic specimens: 
FU'st ativje. — Length, 4 mm. The larva of this stage is very similar to that of S. ijmmea’, the shape of the head, 
of the tubercles, dorsal and lateral, and of the peculiar iiaddle-shaped glandular hairs being identical. I can only 
