NATURAL SCIENCES OF PHILADELPHIA. 349 



reddish brown. Thorax white, disk reddish brown. Fore wings white with 

 a large reddish brown dorsal patch extending from the base to the middle of 

 the wing, and rounded on the costal edge ; an oblique fascia of the same hue 

 from the middle of the costa to about the centre of the wing, with the costa 

 exterior to it streaked alternately with white and reddish brown to the apex. 

 The extreme apex reddish brown. Hind wings grayish fuscous. 



The larva feeds on the leaves of Spiraea o p u 1 i f o 1 i a (nine bark.) One of 

 the veins of the leaf is drawn closely to the midrib so as to produce a fold in 

 it from the base, in which the larva lives and feeds on the parenchyma of the 

 leaf. The larva deserts the food plant to form its cocoon, which is slight and 

 woven between applied or folded leaves. The first brood produce imagos 

 early in July. There is nothing characteristic in the ornamentation of the 

 larva ; its head and body are pale green, or yellowish green. 



A. nub ecu Ian a. Fore wings white with a dark brown dorsal patch 

 extending from the base to the middle of the wing, with its costal edge 

 irregular or doubly curved. The oblique central fascia is almost obsolete 

 except on the middle of the costa where it appears as a dark grayish brown 

 spot, and in the middle of the wing beneath it is a grayish brown round spot 

 exterior to which is a short black dash. The wing above the inner angle is 

 varied with grayish brown and brownish. The costa exterior of the middle is 

 alternately streaked with white and brownish, becoming reddish brown 

 toward the tip. Extreme apex reddish brown. 



A. Platanana. Fore wings pale reddish ochreous, whitish along the 

 costa at the base, frequently with a semioval patch of the general hue at the 

 base of the inner margin. An abbreviated central, oblique fascia of the general 

 hue, with two reddish brown streaks in the middle of the wing near the hind 

 margin, and the costa from the central fascia to the tip, streaked with the 

 general hue and whitish, and with two white streaks in the cilia beneath the 

 tip. Extreme apex reddish saffron. Hind wings whitish. 



The larva folds the leaf of sycamore near the base, weaving a web and 

 drawing the side of the leaf to the midrib in June and July. 



Tip of fore wings not acutely produced. Fore wings with very faintly 

 indicated secondary cell. Hind wings, median vein 2-branched, and with a 

 medio-discal branch. 



A. striatana. Fore wings grayish brown, with three white streaks 

 from the base, one along the costa, one in the middle of the wing, and one 

 along the inner margin. The costa from the middle of the tip is alternately 

 streaked with white and greyish brown. Ocelloid patch whitish with one or 

 two black streaks, and with scales somewhat silvery internally and externally 

 to the streaks. Hind wings fuscous. 



Dr. Morris. Baltimore and Easton. 



Hind wings with median vein 3-branched, the two superior pedunculated. 

 In repose the fore wings are hooked in the middle of hind margin. 



A. co s torn a cula n a. Fore wings ochreous-white, with a costal some- 

 what triangular patch extending from the middle to the tip and rounded in the 

 middle of the wing ; in the middle and toward the tip it is dark reddish brown, 

 and along the costa tinted with dark purplish. The costa minutely striated 

 from the base. Hind wings fuscous, paler towards the base. 



Dysodia. 



Fore wings with a subvitreom spot on the dish; narrow at the base, dilated 

 beyond the middle ; tip obtusely rounded, hind margin rounded, inner margin 

 sinuous. The disk is above the middle of the wing and is dilated posteriorly. 

 From the subcostal vein arise three very oblique marginal branches, the first 

 behind the middle of the disk and the others approximated near its posterior 



I860.] 



