200 MEMOIKS OF THE >AT10NAL ACADEMY OF SCIENCES. 



mark in my male, hut a loug, sleiuler, two scalloped discal line, sending foui- black lines outward 

 along tlie veins. In the 9 a round, distinct' discal dot. An outer, obscure, zigzag, double-sordid 

 wbite line, shaded externally with reddish brown, and indicated when obsolete by a double series 

 of short, longitudinal, black venular streaks. Th(^ venules beyond marked with black scales. 

 Fringe whitisli, dusky toward the apex, and marked with dusky spots. Wings beneath, whitish, 

 dusky on the costal region. 



Hind wings in S white, slightly du.sky on the outer edge, and a dusky ditluse ])atch on the 

 internal angle. Abdomen in both sexes olive whitish ash, becoming paler toward the end, which, 

 iu my single male, is not forked as usual in the genus. 



The 9 difl'ers very much from the S ,and is much more common in collections. The fore wings 

 iin' uniformly of a peculiar stoneash or leaden gray, the basal and outer lines obsolete; a minute 

 black discal dot jiresent. There is, as in the 3 , 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 oi)iK)site 

 the discal dot being the largest. 



Hind wings of 9 uniformly mouse-gray, with no distinct dusky i)atch near the internal angle. 

 Beneath, both wings uniformly dusky, becoming clearer, paler gray on the outer edge. Fore 

 wings with four pale marks on the outer third of the costa. 



Expanse of wings, S 30 mm., 9 30mm.; length of body, S 15mm., 9 15 mm. 



This species differs from 8. ipomem, besides other jjoiuts noted above, in the longitudinal black 

 streaks on the fore wings, in the absence of an inner line, in the linear black discal s|)()t, and in 

 the peculiar white, frosty gray hue or grouud color of the fore wings, there being no reddish or 

 brownish shades, except what is faintly shown in the extradiscal line. It dift'ers from IS. unicornis 

 in the longer and more pointed fore wings and in the absence of reddish brown shades. From 

 both it differs iu the peculiar black triangular mark on the thorax. The females are at once 

 recognized by the peculiar uniform leaden ash-gray grouud color of the fore wings. 



E(i(i. — Transverse diameter, 1 mm., of the same size and shape as those of jS". iponiea'. Hemi- 

 spherical, moderately high, and under a high Tolles lens seen to be very finely jjitted; under a 

 half-iuch objective of Tolles 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 

 »S'. ipomew. 



Toward and at the micropylar region the cells become longer, minuter, and more crowded, and 

 in this respect the egg :-eems to differ from those of (S'. ipomviv, in which the areas are more or less 

 obsolete in the micropylar region. 



Freshly hatched hirra. — Length, 3 mm. The head is very large, nearly twice as wide as the 

 body; deep honey-yellow. 



Prothoracic segment of the same tint as the head, but green behind. The rest of the body is 

 pale yellowish green, with rather large honey-yellow warts. The first and eighth abdominal 

 segments are deej> cherry-red, while the sides of the second to seventh segments above the legs 

 are 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 on segments 2 to 7 are small, 

 of nearly uniform size, and com-olorous with the greenish yellow segments. The end of the body, 

 including the anal legs and the ninth and tenth segments, is upheld as usual in the genus. The 

 thoracic and first four jtairs of abdominal legs are dark. The anal legs smaller than those in 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 in length, the two longest ones, i. e., those on 

 the ])rothoracic segment, being about three times as long as the body is thick. 



(jomiiared with the larva of S. ipomew of the same stage, the two dorsal warts on the 

 l)roth()racic segment api)ear to be a little smaller. The glandular hairs seen under a half-inch 

 ol)jective are of the same length and general shape as in <S'. ipomew, but do not appear to be (juite 

 so bulbous. ' 



' With the .ibove description may be compareil the following one drawn up from Riley's alcoholic specimens: 

 Fb-Kt slufie. — Length, 4 nun. i'he larva of this sfi'ije is very similar to that of ."*. ipoiiiiw, the shape of tlie head, 

 of the tubercles, dorsal and lateral, and of the jiecuhar paddle-shaped glandular hairs being identical. I can only 



